Owner`s Manual

Owner`s Manual
f112
f113
Owner’s Manual
IMPORTANT SAFETY INSTRUCTIONS
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
The lightning flash with arrowhead
symbol, within an equilateral triangle, is
intended to alert the user to the presence
of uninsulated “dangerous voltage” within
the product’s enclosure that may be of
sufficient magnitude to constitute a risk of
electric shock to persons.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE
AMP PANEL OR SPEAKER. NO USER SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED PERSONNEL.
1) Read the Instructions — All safety and operating instructions should be
read before the subwoofer is operated.
The exclamation point within an
equilateral triangle is intended to alert the
user to the presence of important operating
and maintenance instructions in the
literature accompanying the product.
2) Retain the Instructions — The safety and operating instructions should be
retained for future reference.
3) Heed Warnings — All warnings on the subwoofer and in the operating
instructions should be followed.
4) Follow Instructions — All operating and use instructions should
be followed.
5) Water and Moisture — The subwoofer should NOT be used near water – for
example, near a bathtub, washbowl, sink, laundry tub, in a wet basement,
near a swimming pool, etc.
6) Ventilation — The subwoofer should be situated so that its location or
position does not interfere with its proper ventilation. For example, the
subwoofer should not be situated on a bed, sofa, rug, or similar surface
that may block airflow over the heatsink fins. If placing the subwoofer in
a “built-in” installation, ensure that airflow to the heat sink at the rear of
the subwoofer is not impeded. Do not cover the subwoofer heatsink with
tablecloths, curtains, etc.
9) Heat and Flames — The subwoofer should be situated away from heat
sources such as radiators, heat registers, stoves, fireplaces, or other devices
which produce heat. Do not place candles on top of or near the subwoofer.
10) Power sources — The subwoofer should only be connected to a power supply of
the type described in the operating instructions or as marked on the subwoofer.
11) Power Cord Protection — Power-supply cords should be routed so that they
are not likely to be walked on or pinched by items placed upon or against
them, paying particular attention to cords at plugs, convenience receptacles,
and the point where they exit the subwoofer.
Page 2
| Fathom f112 & f113
12) Cleaning — The subwoofer should be cleaned only as recommended in the
operating instructions.
13) Nonuse Periods — The power cord of the subwoofer should be unplugged
from the outlet when the subwoofer is left unused for long periods of time.
14) Lightning and Power Surges — We recommend that you disconnect the
subwoofer from the electrical outlet during electrical storms and/or recurring
power interruptions to prevent damage due to power surges.
15) Object or Liquid Entry — Care should be taken so that objects do not fall
into and liquids are not spilled onto the subwoofer enclosure. Do not expose
the subwoofer to dripping or splashing from liquids. Do not place objects
fi lled with liquids on top of, or near the subwoofer. For example: flower
vases, beverages, liquid-fueled lamps, etc.
16) Damage Requiring Service — The subwoofer should be serviced by qualified
service personnel when:
a. the power-supply cord or plug has been damaged
b. objects have fallen or liquid has been spilled into the subwoofer
c. the subwoofer has been exposed to rain
d. the subwoofer does not appear to operate normally or exhibits a marked
change in performance
e. the subwoofer has been dropped or the cabinet has been damaged
f. the subwoofer driver’s cone and/or suspension has been
physically damaged
17) Servicing — The user should not attempt to service the subwoofer beyond
what is described in the operating instructions. All other servicing should be
referred to qualified service personnel.
18) Overloading — Do not overload wall outlets, extension cords, or outlet strips
as this can result in a risk of fire or electric shock.
19) Grounding — This subwoofer is supplied with a three-prong, grounded
power cord. Precautions should be taken so that the grounding means of the
subwoofer are not defeated. Defeating the grounding prong on the subwoofer
power cord could increase the risk of electric shock and could result in
permanent damage to the subwoofer’s electronics.
WARNING
| Fathom f112 & f113
THIS SUBWOOFER IS CAPABLE OF PRODUCING VERY HIGH SOUND
PRESSURE LEVELS. PLEASE EXERCISE RESTRAINT IN ITS OPERATION TO
PROTECT YOUR HEARING FROM PERMANENT DAMAGE.
Page 3
TABLE OF CONTENTS
JL AUDIO TECHNOLOGIES INCLUDED
IN FATHOM SUBWOOFERS
Important Safety Instructions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
DMA-Optimized Motor System
DMA is JL Audio’s proprietary Dynamic
Motor Analysis system aimed at
improving dynamic motor behavior. As a
result of DMA optimization, loudspeaker
motors remain linear in force over an
extreme range of excursion and also
maintain a highly stable fi xed magnetic
field over a wide power range. This leads
to vastly reduced distortion and faithfully
reproduced transients... or put simply:
tight, clean, articulate bass.
Introduction:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Product Overview: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Placing your Fathom in Your Listening Room: . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Unpacking your Fathom: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Front Control Panel Layout:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Rear Control and Connector Panel Layout: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Front Panel Controls in Detail: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-17
Connecting your Fathom(s): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-25
Recommended Setup Procedure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-30
Frequently Asked Questions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Cleaning Your Fathom: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Troubleshooting: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Limited Warranty / Service Information: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Specifications: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
INTRODUCTION
Congratulations on your purchase of a JL Audio Fathom powered subwoofer
system. This product has been critically engineered to deliver exceptional
performance in your home theater or audio system for many years to come.
As a company, we are intensely committed to core research into
high-performance loudspeaker and amplifier technologies. JL Audio’s longexcursion subwoofer driver designs are widely considered as reference standards for
linear behavior and high output. We have also focused our efforts to create powerful
amplifier and signal-processing technologies specifically aimed at delivering
exceptional low-frequency performance. Your Fathom combines these core
disciplines within a compact, beautifully crafted package to deliver an unparalleled
listening experience.
We sincerely thank you for your purchase and invite you to read this
manual thoroughly in order to achieve the highest level of performance with
your Fathom subwoofer system.
Enjoy.
Page 4
OverRoll™ Surround
(U.S. Patent #5,687,247 and #5,949,898)
The OverRoll™ surround spans over
the driver’s mounting flange, utilizing
available diameter wasted in conventional
speakers. This allows the use of the wider
roll necessary to control high-excursions
without sacrificing precious cone area.
W-Cone™ (U.S. Patent #6,496,590)
The W-Cone™ is a unit-body cone
assembly that delivers astonishing cone
stiff ness with minimal mass.
Floating-Cone™ Attach Method
(U.S. Patent #6,501,844)
This assembly technique ensures proper
surround geometry in the assembled
speaker for better excursion control and
dynamic voice coil alignment.
Plateau-Reinforced Spider Attachment
(U.S. Patent #6,118,884)
This high-integrity suspension attachment
relieves stress from the spider material at
high-excursions for enhanced reliability.
Elevated Frame Cooling Technology
(U.S. Patent #6,219,431 and #6,229,902)
Delivers cool air, through slots directly
above the top-plate, to the voice coil of the
speaker. This enhances power handling
and sound quality by minimizing
dynamic parameter shifts and power
compression.
Radially Cross-Drilled Pole Piece
(U.S. Patent #6,243,479)
This innovative venting system greatly
enhances thermal dissipation and power
handling by directing air flow onto the
voice coil former, working in conjunction
with the Elevated Frame technology.
High-Damping Feedback Circuit
(U.S. Patent #6,441,685)
This proprietary, discrete control circuit
design allows our Class D switching
amplifiers to maintain an excellent
damping factor for improved transient
behavior and fidelity.
| Fathom f112 & f113
PRODUCT OVERVIEW
JL Audio Fathom subwoofers combine a state-of-the-art JL Audio subwoofer
driver and electronics/amplifier package within a highly optimized enclosure
to deliver an exceptional listening experience in your home theater or home
audio system.
The subwoofer driver in your Fathom subwoofer system is capable of
exceptional linear excursion without distress or audible distortion. This
exceptional driver enables your Fathom to reproduce powerful low-frequency
events with stunning impact and unprecedented accuracy. Derived from JL
Audio’s legendary W7 design platform, the Fathom drivers offer peak-to-peak
excursion capabilities well in excess of 3 inches (76mm) to comfortably handle
the dynamics of the most demanding program material.
To get the most from this long excursion driver platform, prodigious amounts
of controlled power are needed. Our electronics engineering team conducted
an intense analysis of typical program material and its dynamic demands in
order to balance current draw and actual output power requirements relative to
the system's impedance characteristics. After careful study, a pair of precisely
engineered switching amplifiers employing patented feedback technology
were created. These advanced designs are capable of unclipped output voltages
equivalent to 1500 watts (f112) and 2500 watts (f113) of RMS power when
referenced to the nominal loudspeaker impedance, allowing us to take full
advantage of each driver's full excursion envelope.
The beautiful cabinet enclosing the workings of your Fathom is also the result
of careful engineering. To contain the pressures created by the Fathom driver, we
utilized solid, CNC-cut, MDF material with extensive internal bracing features
and advanced assembly techniques.
Your listening room is the other enclosure that affects the way your bass will
sound. All rooms create a specific sonic signature, which must be effectively
managed to achieve well-balanced low frequency performance. To aid in this
process, the Fathom includes an extensive set of signal processing tools aimed
at optimizing your Fathom’s performance within your listening space. These
features include JL Audio’s exclusive Automatic Room Optimization system.
As you can see from this brief introduction, there is a lot of technology in this
compact subwoofer. The contents of this manual will explain the features, guide
you through the setup and tuning of your Fathom subwoofer and help you achieve
your ultimate low-frequency listening experience.
If you require assistance, we urge you to contact your authorized
JL Audio retailer for expert setup advice and service.
IMPORTANT
| Fathom f112 & f113
IMPORTANT! IT IS A VERY GOOD IDEA TO READ THE NEXT SECTION
BEFORE UNPACKING YOUR FATHOM. UNPACKING THE SUBWOOFER NEAR
ITS FINAL LOCATION IS RECOMMENDED.
Page 5
PLACING YOUR FATHOM IN YOUR LISTENING ROOM:
Your listening room or theater is an integral part of your sound reproduction
system. The physical dimensions of the room and its furnishings, materials,
doors and windows play an important role in defining how your system sounds.
When you place a sound source in an enclosed rectangular space, “standing
waves” are created, resulting from the relationship between the sound’s
wavelength and your room’s dimensions. In other words, standing waves result
from sound energy that is trapped in the room as it bounces back and forth
between opposing walls. Standing waves in the room create acoustic peaks and
dips where the sound is either louder or softer, based solely on your physical
position in the room. Energy also “builds up” at the room’s boundaries, creating
exaggerated bass response at certain frequencies. These fundamental room
resonances are called room “modes.”
The moral of this mode story is to try and avoid seating positions in standing
wave peak or dip regions. It is highly recommended that you place your listening
chairs in areas where modal peaks and dips are moderate and do not reinforce
one another. The two most obvious areas to avoid are those near the exact center
of the room and those close to any of the room’s walls.
Just as your listening seat can be in a peak or dip region, so can your
subwoofer. When placed in a room corner, a subwoofer maximally excites the
room’s mode structure, creating the strongest output with the fewest dips. When
the subwoofer is pulled away from a corner or wall, the room modes are excited
less, which can alter the sound at your listening seat.
Be sure to experiment with both your listening seat position and subwoofer
position to find the best solution. Careful experimentation usually leads to a
superior sounding system. Use our setup suggestions (illustrated on the opposing
page and the following pages) to get you started.
If you cannot avoid placing your sofa against the back wall or your
subwoofer in a less than optimal position, all is not lost. Your Fathom’s
Automatic Room Optimization (A.R.O.) System can dramatically improve
these less-than-ideal situations.
We recommend that you begin by placing your Fathom in the front of the
room, near the front left or right speaker. Placing it directly in the front corner
of the room will produce the maximum number of peaks and the minimum
number of dips in the bass response. This can be advantageous because the
Fathom’s A.R.O. system can correct the primary peak very effectively, whereas
dips in response cannot be corrected via equalization. Dips in response can only
be minimized via careful subwoofer and listener placement.
Placing the Fathom near solid walls will reinforce bass response and pulling
it away from solid walls will decrease bass. Increasing the distance between the
subwoofer and the walls may help to smooth upper bass response in some rooms.
We recommend that you avoid placing the Fathom near windows to prevent
rattling and sound transmission to the outside world.
Page 6
If you are planning to install your Fathom
inside a cabinet, please refer to the
guidelines on page 8.
| Fathom f112 & f113
Recommended Subwoofer Placement Options for One Fathom
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Page 7
SPECIAL CONSIDERATIONS FOR BUILT-IN INSTALLATIONS
Fathom subwoofers are designed to be “built-in” friendly. All typically
needed controls are located on the front panel above the woofer. A Fathom can
be easily integrated into custom cabinetry by following a few simple guidelines.
1) Allow 4 inches (10 cm) of clear space behind the Fathom’s amp panel for
adequate cooling and connector clearance.
2) On all other sides (except the bottom), allow at least 2 inches
(5 cm) clearance for adequate ventilation.
3) While the Fathom generally runs only warm during spirited operation, we do
recommend that adequate heat vents are included in any custom cabinet which
encloses the Fathom. A pair of 3 inch (7.5 cm) diameter vents near the bottom of
the cabinet and near the top of the cabinet, will allow cool air to circulate over the
amp panel of your Fathom subwoofer system keeping it cool and happy.
4) Your Fathom subwoofer is capable of moving substantial quantities of air. If
the front of the Fathom is covered by a custom grille, the grille must have AT
LEAST 108 square inches (700 sq.cm.) of vent area for the f113 and AT LEAST
85 square inches (550 sq.cm.) for the f112. These areas are equal to the woofer
cone area for each model and will ensure that the Fathom’s output is not
choked by the custom cabinet.
Page 8
Rear-view of cabinet install:
2 in. min.
VENT
VENT
2 in.
min.
VENT
VENT
| Fathom f112 & f113
Using Two Fathoms
When using two Fathoms, try
placement near the front corners of the
room, at diagonally-opposite corners
of the room, or at the center points of
opposing walls as shown at right.
Experimentation with
subwoofer and listener
placement is recommended to
achieve the best results – the
benefits can be substantial.
High-resolution measurements
and professional system calibration
are recommended for the best possible
results & system performance.
| Fathom f112 & f113
Recommended Subwoofer Placement Options for Two Fathoms
Page 9
Recommended Subwoofer Placement Options for Three Fathoms
Using Three or Four Fathoms
Research indicates that the
smoothest bass response for a large
listening area can be achieved using
four subwoofers, placing one at
the midpoint of each of the four
walls (although using two or three
subwoofers can be almost as good).
Experimentation with
subwoofer and listener
placement is recommended to
achieve the best results – the
benefits can be substantial.
High-resolution measurements
and professional system calibration
are recommended for the best possible
results & system performance.
Recommended Subwoofer Placement Options for Four Fathoms
Page 10
| Fathom f112 & f113
UNPACKING YOUR FATHOM
Now that you have determined your Fathom’s position in the room, you can
proceed with unpacking it near its intended location.
%
Unpack this box close to where the
subwoofer will be placed. The subwoofer
is PACKED upside down.This box must be
flipped over CAREFULLY to remove the
subwoofer and minimize effort.
IMPORTANT
$
"
#
IMPORTANT: DUE TO THE WEIGHT OF THE FATHOM SUBWOOFER,
PLEASE EXERCISE CAUTION WHILE UNPACKING AND POSITIONING IT TO
PREVENT INJURY. IF POSSIBLE, ENLIST THE HELP OF A SECOND PERSON TO
FACILITATE THE PROCESS. TO MINIMIZE THE RISK OF INJURY, BEND YOUR
KNEES AND LIFT WITH YOUR LEGS, NOT YOUR BACK.
Detailed instructions on unpacking the subwoofer:
1. Place the carton on the floor near its intended location in the room.
2. Open the top of the carton (observe markings on carton) and remove the manual,
calibration microphone and power cord.
3. Temporarily remove the split-foam packing inserts.
4. Untie and loosen the protective cloth cover to make later removal easier (do not
remove at this time). When you open the cloth cover, you are looking at the
bottom of the subwoofer cabinet.
5. Replace the split-foam inserts to protect the subwoofer’s cabinet
while unpacking.
6. Gently flip the box on its side, folding back the carton flaps to the outside.
7. Holding the carton flaps back, gently flip the carton onto its top (open end).
8. Pull the carton straight up until it clears the subwoofer and place to one side.
9. Remove the one-piece foam insert and place in the carton.
10. Remove the plastic bag and place in the carton.
11. Tilt the subwoofer forward (toward its grille) to remove the rear split-foam insert
first. Then tilt the subwoofer in the opposite direction (towards its amplifier
panel) to remove the remaining split-foam insert. Place both split-foam inserts
in the carton.
12. Remove the protective cloth cover and place in the carton.
IMPORTANT
| Fathom f112 & f113
IMPORTANT! PLEASE RETAIN ALL PACKAGING FOR SAFE
TRANSPORTATION OF THE SUBWOOFER AND FOR ANY FUTURE SERVICE
Page 11
Front Control Panel
The labeled Figure below depicts the front control panel of a Fathom subwoofer.
The f112 and f113 have identical layouts.
A.R.O.
page 14-15
Power
page 14
Page 12
Level Mode
page 15
Input Mode
page 15
Lights
page 16
Master Level
page 16
LP freq. (Hz)
page 16
LP Filter
page 16
phase (deg.)
page 17
e.l.f. trim (dB)
page 17
Polarity
page 17
| Fathom f112 & f113
Rear Controls and Connectors
The labeled Figure below depicts the rear panel of a Fathom subwoofer.
The f112 and f113 have identical layouts.
Unbalanced
Inputs
page 19
Balanced Inputs
page 18
| Fathom f112 & f113
Output to
Slave Connector
page 21
IEC-Style AC
Connector
page 21
Input Mode
Switches
page 20
Page 13
FRONT PANEL CONTROLS IN DETAIL
Power Switch
The “Power” switch determines the operational readiness of the Fathom
subwoofer and should be the only switch used to turn the Fathom on and off.
Do not use a power strip switch, switched outlet or any other external switch as
these may result in undesirable and potentially damaging transient pops. Do not
unplug the Fathom’s AC power cord while the unit is turned on.
The power switch has three positions:
“On”: The Fathom is fully powered at all times. Front panel lights are on
unless they have been turned off via the “Lights” switch.
“Off ”: The Fathom’s internal power amplifier is powered down. In this state,
a negligible current draw will exist for operating the main power relays. All front
panel lights are off.
“Auto”: The Fathom will power up its internal amplifier when an audio signal
is present at any of its inputs and will power down the internal amplifier if no
signal has been detected at its inputs for thirty (30) minutes. When dormant, the
Fathom will draw a small amount of current to power its signal-sensing circuitry.
Front panel lights will turn off when the Fathom powers down and light when the
Fathom powers up (unless they have been turned off via the “Lights” switch).
IMPORTANT
Automatic Room Optimization (A.R.O.)
A powerful feature of the JL Audio Fathom subwoofers is their innovative
Automatic Room Optimization (A.R.O.) technology. This one-touch system
serves to eliminate the single largest acoustic response peak in your home
theater at the main listening seat, greatly improving the in-room low-frequency
response. Calibration of the A.R.O. system is fully automated and takes only a
few minutes to accomplish. Please consult the next section of this manual for
details on how to use the A.R.O. system
Using the included JL Audio calibration microphone, the A.R.O. calibration
procedure takes less than three minutes. In brief, you will connect the included
microphone to the “Calibration Mic.” input, press the Calibrate button, and then
hold the microphone at ear height in your main listening seat during the test.
A series of tones will be played through the Fathom subwoofer, and the room
response will be automatically measured, analyzed and equalized to eliminate
the single largest acoustic room response peak at your listening seat. For detailed
instructions on the A.R.O. setup procedure, refer to pages 29-30.
Calibration Mic. Input
This input is for connecting the supplied JL Audio calibration microphone to
the Fathom subwoofer. Connect one end of the supplied cable to the microphone
and the other end to this jack prior to using the A.R.O. system. The A.R.O.
system is specifically calibrated to this microphone and its connection scheme
is specific to the supplied microphone. The calibration sequence will not operate
when a different microphone is connected or if no microphone is connected.
Demo Button
The Demo button triggers a 20 second long tone sequence that briefly
demonstrates the signals used during A.R.O. calibration. The Demo function is
useful for showcasing the output capability of the Fathom and to verify that the
Fathom (or multiple Fathoms) are operational during system troubleshooting.
To activate the demonstration sequence, press and hold the “Demo” button
for approximately 2 seconds (this built in delay helps prevent accidental
Page 14
| Fathom f112 & f113
activation). Pressing and holding the “Demo” button will activate the demo
sequence even if the A.R.O. defeat function is active (see below.) Once the
demonstration sequence is complete, the Fathom will return to its previously set
operating condition.
Defeat Button
The “Defeat” button turns off or “defeats” the A.R.O. calibration system
and equalizer. Use this feature when you want to be sure that the A.R.O.’s
equalization is not in the signal chain. You can also use the “Defeat” button
to audition both the normal and the A.R.O. optimized settings in your home
theater room. This is a great way to audibly verify what effect the A.R.O. has in
your room.
If “Demo” or “Calibrate” is pressed while the defeat function is active,
“Defeat” is automatically canceled. No other front panel controls will alter the
A.R.O. Defeat state.
Calibrate Button
The Calibrate button activates the ARO test sequence. The calibration routine
will not start unless the supplied JL Audio test microphone is plugged into the
Fathom subwoofer. Once the calibration routine is complete, the green light in
the center of the “Calibrate” button will light and remain illuminated. These
settings are stored by the Fathom and will remain in memory even if power is
disconnected.
During the ARO test sequence the Calibrate button’s green LED will alert the
user to two special conditions:
1. “Subwoofer level too low for A.R.O. calibration” via slow blinking,
approximately one blink per second
2. “Subwoofer level too high for A.R.O. calibration”, approximately three
blinks per second.
Input Mode Indicators
The Input Mode indicator LEDs show the input mode, either “Master” or
“Slave”, selected by the switch on the Fathom’s back panel (unless the “Lights”
switch is set to “off ”). For further details, see page 20.
Level Mode
The two-position Level Mode switch allows you to select between the
following modes:
“Reference”
In this mode, the Master Level control knob has no effect on the Fathom’s
output level. Use this setting if you will primarily be controlling the subwoofer
level via your receiver or preamplifier/processor. For those of us with small
children or overenthusiastic teenagers, this mode of operation will prevent direct
manipulation of the Master Level.
“Variable”
In this mode, the Master Level control knob determines the output level of
the Fathom subwoofer. This mode is also useful when level matching the Fathom
subwoofer to a pair of stereo speakers in a two-channel system. Variable level
operation is needed for proper A.R.O. calibration.
| Fathom f112 & f113
Page 15
Master Level Knob
The Master Level Knob is used to control the output level of the Fathom when
the Variable Level mode is selected on the front control panel.
When rotated fully counter clockwise, the Fathom’s output will be fully
muted. When at the “0” or straight up position, the Variable gain level matches
the Reference level setting. When turned fully clockwise, the Fathom’s output
level is 15 dB higher than the Reference setting.
Lights
The “Lights” selector switch allows the user to select one of three indicator
light modes.
“Off ” turns off all of the front panel LED’s at all times.
“Dim” sets all of the front panel LEDs to a low brightness level when the
Fathom is turned on.
“On” sets all of the front panel LEDs to full brightness level when the Fathom
is turned on.
IMPORTANT: WHEN TROUBLESHOOTING OR CALIBRATING THE A.R.O.
FEATURE, MAKE SURE THAT THE “LIGHTS” SWITCH IS SET TO “DIM” or “ON.”
IMPORTANT
LP Filter
The Low Pass (LP) Filter selector switch determines the operating mode of the
Fathom’s built-in low pass fi lter.
“Off ” defeats the low pass fi lter, completely removing this circuit from the
signal path.
“12 dB” sets the roll off slope of the low pass fi lter to a 12 dB per octave slope
(Butterworth alignment).
“24 dB” sets the roll off slope of the low pass fi lter to a 24 dB per octave slope
(Linkwitz-Riley alignment).
The 24 dB setting more aggressively attenuates high frequencies above the LP
Frequency setting (see below). If you are using the Fathom’s built-in low pass
fi lter, experiment with the LP Filter slope setting to achieve the best transition
to your satellite speakers. If you prefer to use the fi lters and bass management
features in your receiver or preamplifier, defeat the
on-board fi lter by selecting the “Off ” position.
LP Freq
The Low Pass (LP) Frequency selector knob allows the user to choose the rolloff frequency of the Fathom’s internal low pass fi lter. The frequency is variable
between 30 Hz (full counter-clockwise) to 130 Hz (full clockwise). This knob
does not affect the input signal in any way if the LP Filter switch is set to “Off ”.
80 Hz is a commonly used fi lter frequency and usually serves as a good starting
point for adjustments.
Page 16
| Fathom f112 & f113
E.L.F. Trim
The Extreme Low Frequency (“e.l.f. trim”) knob allows the user to apply
a certain amount of signal equalization at 25 Hertz (extremely low bass). At
full counterclockwise rotation, the signal at 25 Hz is cut by 12 dB. At “0” the
equalizer is set flat for zero contribution to the signal. At full clockwise rotation,
the signal at 25 Hz is boosted by 3 dB.
The E.L.F. Trim feature is useful for tailoring the Fathom’s very low frequency
output for your particular room. Adding some boost can make certain material
more exciting. Using the cut function can help to compensate for room or
boundary gain in the low frequencies. Room boundaries and the room’s finite
(limited) size naturally cause very low frequencies to be boosted relative to
other parts of the signal. As such, using the E.L.F. Trim feature to cut the lowest
frequencies can help to tame “bloat” or unnatural sounding low bass in small to
medium sized rooms (and can also reduce unwanted vibrations in the room or
throughout the house).
Polarity
The Polarity switch allows the user to select between normal (0 deg) and
reversed (180 deg) signal polarity. The Polarity switch will primarily affect the
small frequency range around the crossover point between your subwoofer and
satellite speakers.
Unlike the Phase control, which effectively adds time delay, the Polarity
switch produces an instantaneous reversal of the signal’s amplitude peaks.
For example, if at a given reference point a sine wave has an amplitude peak,
by flipping the phase switch you instantly convert that peak into a trough
or amplitude dip. Because the effect of the Polarity switch is immediate, it
compliments the operation of the Phase control and cannot be replaced by it.
When placing your Fathom in the room, experiment with the Polarity switch
before adjusting the “Phase” control. Either position of the Polarity switch may
provide a smoother transition between your Fathom subwoofer and the satellite
speakers. Use source material with good mid and upper bass content for evaluation.
Phase
The Phase control knob allows the user to adjust the “timing” of the
subwoofer output relative to the main speakers. The Phase control will primarily
affect the small frequency range around the crossover point between your
subwoofer and satellite speakers. The Phase control’s labels are referenced to 80
Hz since this is the most common crossover point between satellite speakers and
a subwoofer. Phase settings between 0 degrees (full counter-clockwise rotation)
and 280 degrees (full clockwise rotation) are possible.
Speaker, subwoofer, and listening seat positions vary greatly in home theater
installations. Since physical positioning of speakers relative to the room
boundaries and each other greatly affects the perceived quality of sound output,
sometimes it is helpful to delay the subwoofer output. This is exactly what occurs
when you turn the Phase control beyond 0 degrees.
Once your Fathom has been placed in your listening room to give you the
smoothest overall sound and after you have determined the optimum “Polarity”
switch position (see preceding section), experiment with the position of the Phase
control. Using familiar source material with good mid and upper bass content,
adjust the Phase control and listen for better defined mid-bass and a smoother
transition between the subwoofer and satellite speaker systems. If no single
setting sounds better than another, leave the Phase control at 0 degrees.
| Fathom f112 & f113
Page 17
CONNECTING YOUR FATHOM
Balanced Inputs
If your home-theater receiver or preamplifier/processor provides balanced
outputs, the Fathom’s balanced inputs are the preferred connection. Balanced
connections are used extensively in professional studios and sound reinforcement
applications for a number of very good reasons. Besides ensuring proper grounding
between components, balanced signal transmission is designed to cancel induced
cable noise from the surrounding environment (particularly important with long
cable runs). The bottom line is that your system will be far less likely to exhibit
humming or other extraneous noises if you use balanced connections.
The Fathom subwoofers feature individual left and right balanced input
connections with XLR “combo” jacks. These special jacks accept either a
three-pin male XLR connector or a “tip-ring-sleeve” (TRS) 1/4-inch (6.3 mm)
connector for compatibility with a wide range of equipment.
For systems with a mono subwoofer or “LFE” channel connection, only the
jack labeled “Left or Mono” will be used. This applies to most modern multichannel receivers and preamplifier/processors. Separate left and right input jacks
are provided for systems without a dedicated mono subwoofer connection. This
typically applies to two-channel audio equipment.
Appropriate balanced cables are available from your JL Audio dealer and are
not included with the Fathom.
Technical Notes:
• Do not use the balanced inputs with unbalanced signals via adaptors.
The unbalanced inputs of the Fathom are optically isolated and preferable in
situations where only an unbalanced signal source is available.
• Input connectors are configured according to Audio Engineering Society
recommendations for balanced signal cables as follows:
XLR Connection
Pin 1: Shield
Pin 2: Positive
Pin 3: Negative
TRS connection:
Tip: Positive
Ring: Negative
Sleeve: Shield
IMPORTANT: IF YOUR RECEIVER OR PREAMPLIFIER/PROCESSOR DOES NOT
HAVE XLR OR 1/4-INCH TRS BALANCED OUTPUTS, PLEASE REFER TO THE
“UNBALANCED INPUTS” SECTION ON PAGE 19 FOR INPUT CONNECTION
INFORMATION. DO NOT ATTEMPT TO CONNECT UNBALANCED OUTPUTS
TO THE FATHOM’S BALANCED INPUTS VIA ADAPTORS.
Page 18
The Left and Right inputs on the Fathom
are internally summed to a single mono
channel. Since the Fathom is inherently a
“mono” or single channel device, you can
use the Left and Right inputs for the master
Fathom and then distribute the summed
mono signal to additional slave Fathoms in
the system.
IMPORTANT
| Fathom f112 & f113
Unbalanced Inputs
The Fathom subwoofer features individual left and right unbalanced RCAtype input connectors. These are the most commonly used connectors for home
audio applications and must be used if your receiver or preamplifier/processor
does not provide balanced outputs. While unbalanced connections are not as
noise-immune as a balanced connection, Fathom subwoofers employ optical
isolation on the unbalanced inputs to minimize the possibility of noise in your
system.
For systems with a mono subwoofer or “LFE” channel connection, only
the RCA-type jack labeled “Left or Mono” will be used. This applies to most
modern multi-channel receivers and preamplifier / processors. Separate left and
right RCA-type input jacks are provided for systems without a dedicated mono
subwoofer connection. This typically applies to two-channel audio equipment.
Technical Notes:
• When balanced outputs are not available on the signal source, you must
use the RCA-type unbalanced inputs. Fathoms feature optical isolation
circuitry on the unbalanced inputs to minimize the likelihood of ground
loop induced noise.
• Connections are industry-standard for unbalanced signal cables as follows:
RCA-type connection:
Tip: Positive
Sleeve: Negative
IMPORTANT
| Fathom f112 & f113
IMPORTANT: IF NOISE EXISTS AFTER CONNECTION, FATHOMS ALLOW
FOR GROUNDING OR ISOLATION OF THE UNBALANCED INPUTS. PLEASE
REFER TO THE “INPUT MODE SWITCHES” SECTION ON PAGE 18 OF THIS
MANUAL FOR FURTHER INFORMATION ON MINIMIZING NOISE.
Page 19
Input Mode Switches:
Two switches are located on the rear panel to control unbalanced signal
grounding and master/slave operation.
“Grounded / Isolated” Switch
The “Grounded / Isolated” Input Mode switch affects only the unbalanced
RCA inputs and is designed to facilitate a quiet, hum-free connection to your
audio or home theater system. This feature is included to deal with the signal
grounding issues often encountered in home theater systems when several
components from different manufacturers are interconnected.
The Fathom ships with this switch in the “Isolated” mode. If, with all system
components connected and turned on (but no source material playing), you hear
a continuous low-frequency hum through your Fathom, flip this switch to the
“Grounded” position and evaluate the difference in the noise level. Use whichever
switch position provides the least hum or noise.
IMPORTANT: PLEASE NOTE THAT CHANGING ANY COMPONENT IN THE
OPTIMIZED SYSTEM (RECEIVER, AMPLIFIER, DVD PLAYER, ETC.) COULD
ALTER THE SIGNAL GROUNDING SCHEME AND CAUSE HUM TO APPEAR IN
YOUR PREVIOUSLY QUIET SYSTEM. IF YOU ADD OR CHANGE AN UPSTREAM
COMPONENT IN YOUR HOME THEATER SYSTEM, YOU MAY NEED TO
REVISIT THIS INPUT MODE SETTING ON THE FATHOM SUBWOOFER FOR
OPTIMUM NOISE PERFORMANCE.
IMPORTANT
Master / Slave Switch
The Fathoms are designed to easily accommodate the implementation
of multiple subwoofers in your home theater system through a master/slave
connection chain. This method allows you to utilize the signal processing
features of one Fathom to centrally control multiple Fathoms in the room.
Master/Slave functionality also makes it possible for the A.R.O. system to
optimize the response of a multiple subwoofer installation.
The Fathom ships with this switch in the “Master” position. If you are using
a single Fathom you will use the “Master” position and you need not concern
yourself with this section any further.
If your installation incorporates two or more Fathoms, you will designate one
Fathom as the “Master” and all others in the system as “Slave” subwoofers via
the “Master/Slave” switch on the rear amplifier panel of each Fathom. LED’s on
the front panel of the Fathom are provided to indicate whether the “Master” or
“Slave” mode is selected for a given subwoofer.
From the Fathom operating in “Master” mode, the “Output to Slave” signal
carries any signal processing selected on the Master Fathom (including the
Master Level setting and A.R.O. processing) to further Fathoms operating in
“Slave” mode. “Slave” subwoofer signal processing and level controls will be
inoperable. In this mode, the user does not have to worry about level, crossover,
and other settings for the slave subwoofers.
Technical Notes:
• Selecting the “Slave” position defeats all user-definable signal processing and
the master level control. Because of this, there are some special situations in
which you may want to operate a single Fathom in “Slave” mode. If you are
utilizing outboard signal processing and level-matching controls, activating
the “Slave” mode will prevent anyone from affecting system parameters with
the manual controls on the Fathom.
Page 20
| Fathom f112 & f113
IMPORTANT
IMPORTANT: PLEASE REFER TO THE “SYSTEM CONNECTION DIAGRAMS”
ON PAGES 26-29 FOR MORE INFORMATION ON USING THE INPUT / OUTPUT
CONNECTIONS.
“Output to Slave” Connector
If you are operating more than one Fathom subwoofer in one home theater
system, you will designate one Fathom as the Master (see page 20), and then feed
signal from it to the remaining “Slave” Fathoms via this balanced XLR output.
The “Output to Slave” cable can be connected to the “Left or Mono” balanced
XLR input on the next Fathom. When a Fathom is in “Slave” Mode, its “Output
to Slave” connection can be used to pass signal to further Fathoms operating in
“Slave” mode.
The “Output to Slave” connector is designed to be used as follows:
1) From the “Master” Fathom’s “Output to Slave” connector to the first “Slave”
Fathom’s “Left or Mono” XLR balanced input.
2) From the first “Slave” Fathom’s “Output to Slave” connector to the second
“Slave” Fathom’s “Left or Mono” XLR balanced input.
3) From the second “Slave” Fathom’s “Output to Slave” connector to the third
“Slave” Fathom’s “Left or Mono” XLR balanced input. Etc, etc. (up to ten
Fathoms may be connected in this configuration).Appropriate balanced
cables with XLR terminations are available from your JL Audio dealer and
are not included with the Fathom.
Technical Notes:
• The “Output to Slave” signal carries any signal processing selected on the
Master Fathom (including the Master Level setting and A.R.O. processing)
to further Fathoms operating in “Slave” mode.
• From Fathoms operating in “Slave” mode, the “Output to Slave” signal is an
exact, buffered replica of the balanced input signal, making this method of
signal distribution preferable to using
Y-adapters or splitters.
• Use only shielded, connection cables with high quality
XLR connectors for Master/Slave connection. Never use unbalanced cables
with adaptors.
IEC-Style AC Connector
The IEC-style AC cord receptacle receives the heavy-gauge, 6 ft. (1.8 m) long,
power cord included with your Fathom subwoofer. Your Fathom should only be
powered from a 120 V AC, 60 Hz outlet. Do not use any AC power cord other
than the one supplied with the Fathom.
The Fathom subwoofer is a very powerful device and can draw a lot of current.
If too many components are connected with a Fathom subwoofer to one electrical
outlet, you risk tripping a household circuit breaker during very demanding
program material. If this happens, split the Fathom and other components
between two AC electrical circuits. If possible, for maximum performance,
dedicate an AC circuit to each Fathom.
| Fathom f112 & f113
Page 21
PROCESSOR (BALANCED OUTPUTS)
RECEIVER / PROCESSOR (UNBALANCED OUTPUTS)
PRE OUT
FRONT L REAR CENTER
OUTPUTS
OR
FRONT R REAR
SUB
FATHOM REAR CONTROLS (MASTER)
WARNING! TURN OFF THE FATHOM AND ALL OTHER EQUIPMENT IN THE
SYSTEM BEFORE MAKING OR CHANGING ANY CONNECTIONS!
Page 22
SYSTEM CONNECTION DIAGRAM 1:
One Fathom to
Home Theater Receiver or
Home Theater Preamp/Processor
Most home theater receivers and
preamp/processors provide a single
(mono) subwoofer output. When
connecting a mono subwoofer output
to your Fathom, you will only use the
Fathom’s “Left or Mono” input.
Two connection types are available
for connecting the Fathom to your home
theater system: balanced (XLR or 1/4inch TRS connector) and unbalanced
(RCA-type connector). Balanced
connections provide superior noise
rejection and ensure proper grounding
between components. If your receiver or
processor has balanced outputs, we highly
recommend that you use them.
In the connection diagram at left,
balanced connections are shown as solid
lines, unbalanced connections are shown
dotted. You will only use one of these
input connection methods (not both).
WARNING
| Fathom f112 & f113
SYSTEM CONNECTION DIAGRAM 2:
Multiple Fathoms to
Home Theater Receiver or
Home Theater Preamp/Processor
To greatly simplify using multiple
subwoofers in a single home theater
system, Fathoms incorporate a
“Master/Slave” signal distribution system.
This allows control of all the Fathoms in a
system from a single “Master” unit.
First, you will select one of the Fathom
subwoofers as the “Master” via its upper
“Input Mode” switch. Generally, you
will designate the Fathom closest to the
receiver/preamp as the master. In some
cases; for example, when the control panel
of certain units is difficult to access, you
may prefer to designate the one which is
easiest to access as the master.
Two connection types are available
for connecting the master Fathom to your
home theater system: balanced (XLR or
1/4-inch TRS connector) and unbalanced
(RCA-type connector). Balanced
connections provide superior noise
rejection and ensure proper grounding
between components. If your receiver or
processor has balanced outputs, we highly
recommend that you use them to connect
to the Fathom designated as the master.
In the connection diagram at left,
balanced connections are shown as solid
lines, unbalanced connections are shown
dotted. You will only use one of these
input connection methods for the Fathom
designated as the master (not both).
The remaining Fathoms in the system
will be configured as “Slave” units via
their upper “Input Mode” switches.
Using balanced XLR cables, you will
connect the master Fathom’s “Output to
Slave” to the “Left or Mono” balanced
input of the first slave Fathom. That
slave unit’s “Output to Slave” connector
will feed the “Left or Mono” input of
the next slave unit via another balanced
XLR cable. Subsequent slave units will
be connected in the same manner.
RECEIVER / PROCESSOR
PROCESSOR
PRE OUT
FRONT L REAR CENTER
OUTPUTS
OR
FRONT R REAR
SUB
FATHOM REAR CONTROLS (MASTER)
TO ADDITIONAL FATHOMS
(IF APPLICABLE)
FATHOM REAR CONTROLS (SLAVE)
IMPORTANT
Connections between the “Master” and
“Slave” Fathoms and between “Slave”
Fathoms are via balanced XLR cables ONLY.
WARNING
| Fathom f112 & f113
WARNING! TURN OFF THE FATHOM(S) AND ALL OTHER EQUIPMENT IN
THE SYSTEM BEFORE MAKING OR CHANGING ANY CONNECTIONS!
Page 23
STEREO ACTIVE CROSSOVER (BALANCED OUTPUTS)
STEREO ACTIVE CROSSOVER (UNBALANCED OUTPUTS)
LOW OUT
(SUB OUT)
LOW OUT
(SUB OUT)
LEFT
RIGHT
OR
FATHOM REAR CONTROLS (MASTER)
SYSTEM CONNECTION DIAGRAM 3:
One Fathom in Mono to
Two-Channel Audio System
When connecting a Fathom (or
multiple Fathoms) in mono to a twochannel audio system you will use both
the “Left or Mono” and the “Right” inputs.
Summing circuitry in the Fathom’s input
section will sum the stereo signals to
mono.
We strongly recommend that you
use a high-quality active crossover
to divide your preamplifier’s signals
prior to connection to the Fathom and
to the amplifier driving your main
speakers. This will allow you to fi lter low
frequencies out of the signals driving
the main speakers, resulting in better
performance.
If you are not using an active crossover
and are comfortable running your main
speakers full-range, you can split your
preamplifier’s output signals using
appropriate Y-connectors in place of the
active crossover shown in the diagram.
Two connection types are available
for connecting the Fathom to your
two-channel audio system: balanced
(XLR or 1/4-inch TRS connector) and
unbalanced (RCA-type connector).
Balanced connections provide superior
noise rejection and ensure proper
grounding between components. If your
preamplifier or active crossover offers
balanced outputs, we highly recommend
that you use them.
In the connection diagram at left,
balanced connections are shown as solid
lines, unbalanced connections are shown
dotted. You will only use one of these
input connection methods (not both).
NOTE: If desired, additional Fathoms
can be connected in “Slave” mode to
the Fathom connected as shown on this
diagram. See “Connection Diagram 2” on
page 23 for slave connection explanation.
WARNING! TURN OFF THE FATHOM AND ALL OTHER EQUIPMENT IN THE
SYSTEM BEFORE MAKING OR CHANGING ANY CONNECTIONS!
Page 24
WARNING
| Fathom f112 & f113
SYSTEM CONNECTION DIAGRAM 4:
Two Fathoms in Stereo to
Two-Channel Audio System
When connecting two Fathoms in
stereo to a two-channel audio system you
will only use the “Left or Mono” inputs
of each Fathom. The upper “Input Mode”
switch on each Fathom will be set in the
“Master” position.
We strongly recommend that you
use a high-quality active crossover
to divide your preamplifier’s signals
prior to connection to the Fathom and
to the amplifier driving your main
speakers. This will allow you to fi lter low
frequencies out of the signals driving
the main speakers, resulting in better
performance.
If you are not using an active crossover
and are comfortable running your main
speakers full-range, you can split your
preamplifier’s output signals using
appropriate Y-connectors in place of the
active crossover shown in the diagram.
Two connection types are available
for connecting the Fathoms to your
two-channel audio system: balanced
(XLR or 1/4-inch TRS connector) and
unbalanced (RCA-type connector).
Balanced connections provide superior
noise rejection and ensure proper
grounding between components. If your
preamplifier or active crossover offers
balanced outputs, we highly recommend
that you use them.
In the connection diagram at right,
balanced connections are shown as solid
lines, unbalanced connections are shown
dotted. You will only use one of these
input connection methods (not both).
STEREO ACTIVE CROSSOVER (BALANCED OUTPUTS)
STEREO ACTIVE CROSSOVER (UNBALANCED OUTPUTS)
LOW OUT
(SUB OUT)
LOW OUT
(SUB OUT)
LEFT
RIGHT
OR
FATHOM REAR CONTROLS (MASTER)
FATHOM REAR CONTROLS (MASTER)
NOTE: If desired, additional Fathoms
can be connected in “Slave” mode to
each Fathom connected as shown on this
diagram. See “Connection Diagram 2” on
page 23 for slave connection explanation.
WARNING
| Fathom f112 & f113
WARNING! TURN OFF THE FATHOM(S) AND ALL OTHER EQUIPMENT IN
THE SYSTEM BEFORE MAKING OR CHANGING ANY CONNECTIONS!
Page 25
RECOMMENDED SETUP PROCEDURES
1) Preparation for Setup Process: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26-27
2) Level Setting: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3) Polarity/Phase Adjustment: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4) Experiment with Location: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5) Apply A.R.O: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-30
6) Adjust E.L.F. Trim: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
PREPARATION FOR SETUP PROCESS:
Please confirm the following system settings before beginning the setup
process. This will ensure a neutral starting point and an effective setup of your
subwoofer system.
On your Home Theater Receiver or Preamp/Processor:
Before beginning setup of your Fathom subwoofer system we recommend that
you set your receiver or preamp/processor as follows (please turn off all Fathoms
in the system prior to making these adjustments):
1. Speaker Size
In the speaker setup menu of your receiver or preamp/processor, set up all of
your high-frequency speakers as “small” with a crossover point of 80 Hz. This
will send ALL bass to the Fathom(s).
2. Speaker Distance
In the speaker setup menu, properly set all speaker distances to the primary
listening seat, including the subwoofer’s distance. Use a tape measure to
determine these distances (time coherence is important.) If multiple Fathoms
are being used, average their distances to the primary listening seat and use
that number to set the subwoofer distance.
3. Subwoofer Level
Set the subwoofer level in the receiver or preamp/processor “0” or its middle
position.
4. Tone Controls / Equalizers
Set all tone controls to “0” and defeat all equalizer features.
On your Active Crossover or Bass Management Processor:
If you are using an active crossover or bass-management processor, we
recommend that you set it as follows before beginning setup of your Fathom
subwoofer system (please turn off all Fathoms in the system prior to making
these adjustments):
1. Low-Pass Filter Frequency
Select a low-pass filter frequency of 80 Hz (12dB/octave slope)
2. High-Pass Filter Frequency
Select a high-pass fi lter frequency of 80 Hz (12dB/octave slope)
3. Low-Pass (Subwoofer) Output Level
Set the subwoofer output level to “0” or its middle position.
Page 26
| Fathom f112 & f113
On the Fathom’s Front Panel:
Please turn off the home theater receiver or preamp/processor to make these
adjustm ents.
1. “Power” Switch
Flip each Fathom’s “Power” switch to the “On” position.
2. “Lights” Switch
Flip each Fathom’s “Lights” switch to the “On” position. If you don’t see any
lights on the front panel, you may have forgotten to plug the Fathom in or
there may be a problem with the electrical circuit.
3. “Input Mode” Indicator Lights
If you are using a single Fathom, confirm that its “Input Mode” indicator light
is on the “Master” position. If not, you will need to access the upper “Input
Mode” switch on the rear panel of the Fathom.
If you are using multiple Fathoms in a Master/Slave configuration, confirm
that the unit connected directly to your receiver or preamp/processor is
indicating “Master” on its “Input Mode” lights and that all other units are
indicating “Slave” on their “Input Mode” lights. If not, you will need to access
the upper “Input Mode” switches on the rear panels of the Fathoms.
3. “Level Mode” Switch
Flip the master Fathom’s “Level Mode” switch to the “REF” position.
4. “LP Filter” Switch
If your home theater receiver/processor is handling bass management
(speakers set on “small”) or if you are using an outboard crossover/bassmanagement processor, flip the master Fathom’s “LP Filter” switch to “OFF.” If
not, select the “12 dB” position.
5. “LP Freq. (Hz)” Knob
Rotate the “LP Freq.” knob to the “80 Hz” position.
6. “e.l.f. trim (dB)” Knob
Rotate the “e.l.f. trim” knob to “0”
7. “Polarity” Switch
Flip the “Polarity” switch to “0”.
8. “phase (deg.)” Knob
Rotate the “phase” knob to “0” degrees
9. A.R.O. Defeat Switch
Press the A.R.O. defeat switch so that the red light in the
switch remains lit.
| Fathom f112 & f113
Page 27
RECOMMENDED SETUP PROCEDURES (continued)
Subwoofer System Setup:
Once you have set the controls on your home theater receiver or preamp/
processor and on your Fathom(s) to the settings recommended on pages 26 and
27, you are ready to begin setting up your Fathom for optimum performance.
1) Level Setting
Using familiar music or movie material with deep bass content, adjust the
subwoofer level to blend with the other speakers using your receiver or preamp/
processor’s subwoofer level control. This method is more immune to tampering
than using the Fathom’s “Master Level” knob (think toddlers or curious visitors).
In the unlikely event that the subwoofer level control in your receiver or
preamp/processor cannot be turned up enough to level match the Fathom, return
that control to “0”. Then, flip the Fathom’s “Level Mode” switch to “Variable”
and with “0” as your reference point (REF mode gain and Variable “0” gain are
identical) use the “Master Level” control to level match the subwoofer with the
other speakers. MAKE NOTE OF THIS SETTING FOR FUTURE USE.
For more detailed information on your Fathom’s level setting controls, please
refer to the “Level Mode” and “Master Level” sections on page 29 of this manual.
2) Polarity and Phase Adjustment
It is often helpful to have a second person operating these controls so that you
can easily hear the changes from the primary listening seat.
Listening to familiar source material (preferably music with good upper bass
and midbass response), flip the “Polarity” switch from “0” to “180” and listen for
differences. The correct setting will sound most natural with the best upper bass
punch and articulation. If both sound similar, choose “0”.
Once Polarity is set, use the same music material to audition different “Phase”
control settings and choose the one that further enhances the upper and midbass
response. If you can’t hear a difference, set the control to “0.”
3) Experiment with alternative subwoofer locations (if necessary).
If you are satisfied with the basic performance of your subwoofer you are
ready to move on to the next step. If not, we recommend that you experiment with
the position of your subwoofer until you are pleased with its basic performance.
Experimentating with placement is KEY to a superior sounding system. Moving the
subwoofer just a few feet can have a significant effect on the smoothness of the bass.
For each new position, start with the polarity and phase controls at “0” and repeat the
setup process beginnng with Step 1.
IMPORTANT! WRITE DOWN ALL SETTINGS PERFORMED IN STEPS 1-3 FOR
FUTURE REFERENCE.
Page 28
IMPORTANT
| Fathom f112 & f113
IMPORTANT
IMPORTANT! IMPORTANT! MAKE SURE THE ROOM IS QUIET DURING A.R.O.
CALIBRATION! TURN OFF ANY NOISY APPLIANCES NEAR THE LISTENING
ROOM (DISHWASHERS, WASHING MACHINES, ETC.)
IT IS PARTICULARLY IMPORTANT TO TURN OFF AIR CONDITIONERS OR HEAT
PUMPS DURING CALIBRATION. THESE FORCED-AIR-TYPE HVAC SYSTEMS
CAN CREATE MODERATE LEVELS OF 15 – 20 HZ NOISE THAT MAY INTERFERE
WITH CALIBRATION.
DO NOT TALK, COUGH OR SNEEZE DURING CALIBRATION AS THIS MAY
CORRUPT THE CALIBRATION MEASUREMENTS.
4) Applying Automatic Room Optimization (A.R.O.)
You are now ready to apply the power of JL Audio’s exclusive Automatic Room
Optimization system. This system will measure the response of the subwoofer at
your primary listening seat and apply a powerful equalizer to tame the primary
room mode, resulting in smoother, more accurate bass performance. If you are
using multiple Fathoms in a master/slave configuration, you will only need to
address the unit designated as “master” to perform A.R.O. calibration for the entire
subwoofer system.
a) Set the Main Power switch to the “ON” position and be sure the Fathom’s
indicator lights are switched “ON” via the “Lights” switch.
b) Flip the Fathom’s “Level Mode” switch to “Variable” and turn the Master Level
control to the “12 o’clock” position. If you were already in “Variable” mode, make
a note of the volume position you established during Level Setting (Step 1) before
turning it to the “12 o’clock” position for A.R.O. calibration. In most cases, you
will need to tweak the overall level of the subwoofer after the A.R.O. calibration is
run, but you need to know your prior setting to begin that process.
c) Set the LP Filter to “OFF”
d) Verify that the “e.l.f. trim” control is set to “0”
e) Remove the calibration microphone from its protective pouch
and connect its cable to the mini-XLR jack on the Fathom’s front control panel.
NOTE: A.R.O. Calibration is only possible when the included JL Audio test
microphone is plugged in to the Fathom front panel. The “Calibrate” feature is
disabled with no microphone plugged in to prevent accidental loss of settings.
f) Connect the microphone to the other end of the mic cable and temporarily place
the mic in the primary listening seat. If you have a microphone stand, you can
place the microphone at head height and position in the primary listening seat.
g) On the Fathom’s control panel, press the “Calibrate” button. The green light on
the “Calibrate” button will turn on, indicating that calibration will begin in 5
seconds.
NOTE: If you have already run A.R.O. once, the “Calibrate” light will already be on.
Each time A.R.O. calibration is run, the previous settings are erased and the new
settings are stored.
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Page 29
h) Within 5 seconds of pressing the “Calibrate” button, return to your primary
listening seat and hold the microphone in your normal, seated head position at
the approximate height of your ears.
i) A series of quick, stepped tones will begin which are used by the A.R.O. software
to set an appropriate bass level at your seat for the test. If these tones stop after
two to five cycles, the “Calibrate” button’s light will start to blink, indicating a level
setting error.
Slow blinking (approximately once per second) indicates the level selected
on the “Master Level” control was too low. Increase the Master Level control
approximately one eighth of a turn and go back to Step “g”.
If the Calibrate light is blinking quickly (approximately 3 times per second), this
indicates that the “Master Level” was set too loud. Decrease the Master Level
control by approximately one eighth of a turn and return to Step “g”.
j) When the “Master Level” is properly set, a slow series of tones will be played from
20 Hz to 100 Hz after the stepped, level-setting tones. During this process, the
A.R.O. system is taking a frequency response measurement at your listening seat.
When A.R.O. is finished calibrating, the “Calibrate” button will light and stay on,
indicating a successful calibration.
k) Return your Fathom’s front panel controls to their previously determined settings
(before the A.R.O. calibration run) and re-tweak the subwoofer output level as
described in Step 1 (Level Setting) on page 28. Since the A.R.O. will smooth the
largest peak in the bass response at the listening seat, the apparent subwoofer level
may appear lower. Simply increase the subwoofer level until you are satisfied.
IMPORTANT! IF YOU MOVE YOUR FATHOM OR PRIMARY LISTENING SEAT
IN THE FUTURE, YOU WILL NEED TO RUN A.R.O. AGAIN. ANY PARTICULAR
CALIBRATION IS UNIQUE TO THAT PARTICULAR SUBWOOFER POSITION
AND LISTENING SEAT POSITION COMBINATION. SIMPLY FOLLOW THE
STEPS ABOVE TO CREATE A NEW CALIBRATION CURVE.
IMPORTANT
5) Extreme Low Frequency (e.l.f.) Trim
Use the “e.l.f. trim” control to adjust the extreme low bass extension of the
Fathom. This control allows -12 dB of cut or +3 dB of boost at 25 Hertz and is
particularly useful when using a Fathom (or two) in a small to medium sized home
theater. Since smaller enclosed spaces help to boost the level of the lowest bass
frequencies, smaller theaters can be overwhelmed by the strong low-bass output
of the Fathom subwoofer. This can create a “thick” or “bloated” character in the
lower bass region. Turning down the “e.l.f. trim” knob cuts the extreme low bass
level and alleviates this condition. Feel free to experiment and listen to a variety of
demanding material until you find the best match for your room and your tastes.
Your Fathom is now optimized for maximum bass performance at your
listening seat. Congratulations!
Page 30
| Fathom f112 & f113
FREQUENTLY ASKED QUESTIONS
Can I place objects on my subwoofer?
We do not recommend placing any items on the subwoofer cabinet as they may
vibrate, causing undesirable noise and possible damage to the finish. Under no
circumstances should any object containing liquid be placed on the Fathom cabinet.
Is the Fathom magnetically shielded?
Fathom subwoofers are not magnetically shielded. To avoid magnetic distortion
with certain television types, place the Fathom at least 3-4 feet (1 - 1.5m) from
your screen. If you notice any discoloration in the picture, try moving the
subwoofer further away until these artifacts disappear.
Will my electric bill be high if I leave the Fathom in “Auto” mode?
When in “Auto” mode, the Fathom amplifier is only powered up when a
significant signal is detected on the inputs. When powered down, only
“housekeeping” circuits remain on, which draw negligible amounts of power
from the wall (less than 5 watts).
Should I unplug my subwoofer during a thunderstorm or extended absence?
YES. You should unplug your Fathom during (or before) thunderstorms. This
will prevent any possible damage from voltage spikes due to lightning. In these
conditions, it’s a good idea to unplug all of your audio / video components. If you
are going to be away from home for several days, it is also a good idea to unplug
your home theater components to prevent damage from unexpected storms or
power line conditions.
| Fathom f112 & f113
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CLEANING YOUR FATHOM
Dust your Fathom subwoofer’s cabinet using a clean, soft microfiber cloth or
feather duster. Microfiber cloths are commonly available where automotive
detailing supplies are sold.
Gloss-black models:
Light smudges can generally be wiped off with a clean microfiber cloth. For more
stubborn smudges, polish and protect the finish using a high-quality automotive
wax and a microfiber cloth, both available wherever automotive detailing
supplies are sold. We recommend Meguiar’s® “NXT Tech Wax” and Meguiar’s®
Microfiber Detailing cloths.
Never use a polish that contains harsh solvents or abrasives as these may
permanently damage the finish. Never use furniture polish or any oil-based
product on your Fathom. Never use solvents or aggressive cleaning agents on
your Fathom. When in doubt, test the cleaning product on the underside of
the cabinet and let it sit for several days before committing to its use on visible
portions of the cabinet.
Page 32
| Fathom f112 & f113
TROUBLESHOOTING
No sound from subwoofer.
1. Verify that Fathom is plugged in, turned “ON” & that front panel lights are
“ON”. If the Fathom will not power up, check the circuit breaker that feeds its
outlet.
2. Test subwoofer using DEMO button on front panel – if sub emits demo
tones the subwoofer’s internal circuitry is fine and an input problem is likely.
Check the input cable connections at the Fathom and at the receiver/preamp/
processor.
3. Verify that your receiver’s subwoofer settings have not changed
4. If your other speakers play, but the Fathom does not, try changing the cable
that connects the Fathom to the system.
5. If the problem persists, call your dealer or JL Audio Technical Support for
assistance.
The bass level has changed.
1. Make sure your level settings (on the Fathom and in your receiver/preamp/
processor) have not changed.
2. If you are using the Fathom’s “Master Level” knob to set the subwoofer level,
confirm that the “Level Mode” switch is set to “Variable”.
3. Verify the position of the ELF Trim knob.
Hums or other unusual noises from your Fathom
1. See Input Mode discussion on page 20 of this manual, especially if any
upstream components, cables, etc., have recently changed.
2. Turn off the Fathom, disconnect all its input and output signal cables, turn the
Fathom back on. If the noise disappears, the noise is being caused elsewhere in
your system.
Bass sounds “muddy” or “too heavy”.
1. Try decreasing the 25 Hertz level using the “e.l.f. trim” control. Muddy bass
can sometimes be caused by too much low frequency output in a moderately
sized room.
2. Decrease the overall subwoofer level.
3. Verify your receiver’s subwoofer settings.
4. Try a different subwoofer or main listening seat location. Changing one or the
other can have a HUGE effect on how your system sounds. See the placement
discussion on pages 6-10 of this manual.
Your Fathom is clearly audible outside of your house.
1. Revisit the “Master Level” setting on your Fathom(s) or your home theater
receiver/preamp/processor.
2. Inquire with your JL Audio dealer about noise isolation strategies.
3. Move the Fathom away from windows.
Angry neighbors knocking at your door.
Invite them in and offer them a beverage.
| Fathom f112 & f113
Page 33
Page 34
| Fathom f112 & f113
LIMITED WARRANTY / SERVICE INFORMATION
JL AUDIO warrants this product to be free of defects in materials and
workmanship for a period of three (3) years from the original date of purchase.
Damage caused by the following is not covered under warranty: accident,
misuse, abuse, product modification or neglect, failure to follow installation
instructions, unauthorized repair attempts, misrepresentations by the seller. This
warranty does not cover incidental or consequential damages and does not cover
the cost of removing or reinstalling the unit(s) or shipping the unit(s) to JL Audio
for service. Cosmetic damage due to accident or normal wear and tear is not
covered under warranty.
This warranty is not transferable and applies only to the original purchaser
of the product from an authorized JL AUDIO dealer. Warranty is voided if the
factory-applied product serial number is removed or defaced.
Should service be necessary under this warranty for any reason due to
manufacturing defect or malfunction, JL AUDIO will, at its discretion, repair or
replace the defective product with new or remanufactured product at no charge.
Any applicable implied warranties are limited in duration to the period of
the express warranty as provided herein beginning with the date of the original
purchase at retail, and no warranties, whether express or implied, shall apply
to this product thereafter. Some states do not allow limitations on implied
warranties, therefore these exclusions may not apply to you. This warranty gives
you specific legal rights, and you may also have other rights which vary from
state to state.
If you need service on your JL AUDIO product:
All warranty returns should be sent to JL AUDIO freight prepaid through
an authorized JL AUDIO dealer and must be accompanied by proof of purchase
(a copy of the original sales receipt.) Direct returns from consumers or nonauthorized dealers will be refused unless specifically authorized by JL AUDIO
with a valid return authorization number. Warranty expiration on products
returned without proof of purchase will be determined from the manufacturing
date code. Coverage may be invalidated as this date is previous to purchase date.
Return only defective components. Non-defective items received will be returned
freight-collect. Customer is responsible for shipping charges and insurance in
sending the product to JL AUDIO. Freight damage on returns is not covered
under warranty. Always include proof of purchase (sales receipt).
For Service Information in the U.S.A. please call:
JL Audio customer service:
(954) 443-1100 during normal business hours (Eastern Time)
JL Audio, Inc • 10369 North Commerce Parkway, Miramar, FL 33025
International Warranties:
Products purchased outside the United States of America are covered only by that
country’s distributor and not by JL Audio, Inc.
| Fathom f112 & f113
Page 35
FEATURES
Unbalanced Inputs:
Stereo or Mono (RCA jacks)
Balanced Inputs:
Stereo or Mono (female XLR combo jacks)
Output To Slave:
Balanced (male XLR jack)
Input Modes:
Master or Slave
Level Modes:
Reference (fi xed gain) or Variable from
full mute to +15dB over reference gain
Power Modes:
Off, On or Automatic Signal-Sensing
Light Modes:
Off, On or Dim
Low Pass Filter Mode:
Off, 12 dB per octave or 24 dB per octave
Low Pass Filter Cutoff Frequency:
Variable from 30 Hz – 160 Hz
Polarity:
0 or 180 degrees
Phase:
Variable from 0 – 280 degrees
E.L.F. Trim:
Variable from –10 dB to +5 dB at 20 Hz
f112
f113
fathom home subwoofer
fathom home subwoofer
Sealed
Sealed
Single 12-inch (nominal diameter)
Single 13.5-inch (nominal diameter)
Frequency Response:
20-200 Hz (+1dB / -3dB)
19-200 Hz (+1dB / -3dB)
Effective Piston Area:
84 sq. in. (0.0542 sq. m)
107.35 sq. in. (0.0693 sq. m)
287 cu. in. (4.7 liters)
386 cu. in. (6.3 liters)
1500 watts RMS short-term
2500 watts RMS short-term
18.5 in. x 15.0625 in. x 17.75 in.
470 mm x 384 mm x 451 mm
19.75 in. x 16.5 in. x 19.25 in.
502 mm x 419 mm x 489 mm
115 lbs. (52 kg)
130 lbs. (59 kg)
High-Gloss Black or Satin Black
High-Gloss Black or Satin Black
Specifications
Enclosure Type:
Driver:
Effective Displacement:
Amplifier Power:
Dimensions: (H) Height x (W) Width x (D) Depth
Height Dimensions include feet.
Net Weight:
Cabinet Finishes:
Automatic Room Optimization (A.R.O.)
with included calibration microphone,
defeatable.
w w w. j l a u d i o . c o m
(954) 443-1100
“JL Audio®”, and the JL Audio logo are registered trademarks of JL Audio, Inc.,“Ahead of the Curve” is a trademark of JL
Audio, Inc. Due to continuous product development, all specifications are subject to change without notice.
JLA-SKU011172-01-2007rev1 • Printed in USA • ©2006 JL Audio, Inc. • U.S. PATENTS: #5,734,734 #5,949,898
#6,118,884 #6,229,902 #6,243,479 #6,294,959 #6,501,844 #6,496,590 #6,441,685 #5,687,247 #6,219,431 #6,625,292
#D472,891 #D480,709 Other U.S. & Foreign patents pending. For more detailed information please visit us online at www.
1 0 3 6 9 N O RT H C O M M E R C E PA R K WAY
Page 36
•
MIRAMAR, FLORIDA
•
33025
•
USA
| Fathom f112 & f113
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