1 Mitek Plaza
Winslow, IL 61089
Powered Home Subwoofer
Owner’s Manual
Your speakers are designed to work with a wide range of electronic components.
As little as 20 watts per channel can provide enough power for most applications.
If you have a large room or prefer louder listening levels, more power may be
Caution: When choosing an amplifier, do not exceed the power rating of the
speaker. If you hear very high levels of audible distortion you are exceeding
the capabilities of the system. Damage can occur from this distortion, turn the
volume back down until the distortion disappears.
Use the following guidelines to maintain the appearance of your speakers. Use
a soft, damp cloth to clean the speaker cabinet. Avoid using harsh detergents
or cleaning fluids. Remove the grills to vacuum any of the speaker components,
permanent damage could occur.
For additional technical assistance you can visit our web site at www.mtx.com.
Otherwise, our technical service representatives can be reached by phone: 1-800CALL-MTX or by E-mail: [email protected]
MTX Loudspeakers purchased in the United States from an authorized MTX
dealer are guaranteed against defective material and workmanship for a period of
TWO YEARS from the date purchased by the end user, and limited to the original
retail purchaser of the product. Product found to be defective during that period
will be repaired or replaced by MTX at no charge. This warranty is void if it is
determined that unauthorized parties have attempted repairs or alterations of any
nature. Warranty does not extend to cosmetic or finish. Before presuming a defect
is present in the product, be certain that all related equipment and wiring is functioning properly. MTX disclaims any liability for other incurred damages resulting
from product defects. Any expenses incurred in the removal and reinstallation of
products are not covered by this warranty. MTX’s total liability will not exceed the
purchase price of the product. If a defect is present, your authorized MTX dealer
may be able to effect repairs.
Proof of purchase is required when requesting service, so please retain your
sales receipt and take a moment to register your warranty on line @www.mtx.com.
Amplifier Type:
Class A/B
Frequency response:
40 Hz - 160 Hz
Lo-pass xover
60 Hz - 160 Hz at 18 dB per octave
Line level and speaker level full range
Line level
Hi-pass subsonic filter:
18 dB per octave below 30 Hz
Polarity switch:
Normal (0 degrees)/reverse (180 degrees)
Power: (continuous)
100 watts
Voice coil diameter:
34.5 lbs
41.5 lbs
Specifications subject to change without notice.
1. Read Instructions – All the safety and operating
instructions should be read before the product is
2. Retain Instructions – The safety and operating
instructions should be retained for future reference.
3. Heed Warnings – All warnings on the product and
in the operating instructions should be adhered to.
4. Follow Instructions – All operating and use
instructions should be followed.
5. Cleaning – Unplug this product from the wall
outlet before cleaning. Do not use liquid cleaners or
aerosol cleaners. Use a damp cloth for cleaning.
Exception: A product that is meant for uninterrupted
service and that for some specific reason, such as
the possibility of the loss of an authorization code for
a CATV Converter, is not intended to be unplugged
by the user for cleaning or any other purpose, may
exclude the reference to unplugging the product in the
product in the cleaning description otherwise required
in above 5).
6. Attachments – Do not use attachments not
recommended by the product manufacturer as they
may cause hazards.
7. Water and Moisture – Do not use this product
near water – for example, near a bath tub, wash bowl,
kitchen sink, or laundry tub; in a wet basement; or
near a swimming pool; and the like.
8. Accessories – Do not place this product on an
unstable cart, stand, tripod, bracket, or table. The
product may fall, causing
serious injury to a child
or adult, and serious
damage to the product.
Use only with a cart, stand,
tripod, bracket, or table
recommended by the
manufacturer, or sold with
the product. Any mounting
of the product should
follow the manufacturer’s
instructions, and should
use a mounting accessory recommended by the
9. A product and cart combination should be moved
with care. Quick stop, excessive force, and uneven
surfaces may cause the product and cart combination
to overturn.
10. Ventilation – Slots and openings in the cabinet
are provided for ventilation and to ensure reliable
operation of the product and to protect it from
overheating, and these openings must not be blocked
or covered. The openings should never be blocked
by placing the product on a bed, sofa, rug or other
similar surface. This product should not be placed in a
built-in installation such as a bookcase or rack unless
proper ventilation is provided or the manufacturer’s
instructions have been adhered to.
11. Power Sources – This product should be
operated only from the type of power source indicated
on the marking label. If you are not sure of the type
of power supply to your home, consult your product
dealer or local power company. For products intended
to operate from battery power, or other sources, refer
to the operating instructions.
12. Grounding or Polarization – This product may be
equipped with a polarized alternating-current line plug
(a plug having one blade wider than the other). This
plug will fit into the power outlet only one way. This is
a safety feature. If you are unable to insert the plug
fully into the outlet, try reversing the plug. If the plug
should still fail to fit, contact your electrician to replace
your obsolete outlet. Do not defeat the safety purpose
Your new subwoofer, once set-up and adjusted, should give you years of listening
enjoyment with your favorite movies and music. However, if you should experience
a problem with your unit, the following chart should help you locate the trouble:
of the polarized plug.
13. 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 from the product.
15. Outdoor Antenna Grounding – If cable system is
connected to the product, be sure the cable system
is grounded so as to provide some protection against
voltage surges and built-up static charges.
16. Lightning – For added protection for this product
during a lightning storm, or when it is left unattended
and unused for long periods of time, unplug it from
the wall outlet and disconnect the antenna or cable
system. This will prevent damage to the product due
to lightning and power-line surges.
17. Overloading – Do not overload wall outlets,
extension cords, or integral convenience receptacles
as this can result in a risk of fire or electric shock.
18. Object and Liquid Entry – Never push objects of
any kind into this product through openings as they
may touch dangerous voltage points or short-out parts
that could result in a fire or electric shock. Never spill
liquid of any kind on the product.
19. Servicing – Do not attempt to service this product
yourself as opening or removing covers may expose
you to dangerous voltage or other hazards. Refer all
servicing to qualified service personnel.
20. a) When the power-supply cord or plug is
b) If liquid has been spilled, or objects have fallen
into the product.
c) If the product has been exposed to rain or
d) If the product does not operate normally by
following the operating instructions. Adjust only
those controls that are covered by the operating
instructions as an improper adjustment of other
controls may result in damage and will often
require extensive work by a qualified technician
to restore the product to its normal operation.
e) If the product has been dropped or damaged in
any way.
21. Replacement Parts – When replacement parts
are required, be sure the service technician has used
replacement parts specified by the manufacturer or
have the same characteristics as the original part.
Unauthorized substitutions may result in fire, electric
shock, or other hazards.
22. Safety Check – Upon completion of any service or
repairs to this product, ask the service technician to
perform safety checks to determine that the product is
in proper operating condition.
23. Wall or Ceiling Mounting – The product should be
mounted to a wall or ceiling only as recommended by
the manufacturer.
24. Heat – The product should be situated away from
heat sources such as radiators, heat registers, stoves,
or other products (including amplifiers) that produce
1) Subwoofer makes loud noise at turn-on.
2) Subwoofer has no output.
a) Status LED off
b) Red light on
c) Green light on
A) Muting circuit is defective.
Return unit for repair.
A) Line cord is not plugged in.
B) Line fuse is blown. Unplug line cord
from wall outlet,then check fuse.
C) Internal fuse is blown. Return unit for
A) No signal is reaching the unit.
Check connections from receiver or
B) Power switch is turned off. Place switch
to “stand by” or “on” mode.
A) Signal is present, but input level control
is set at minimum.
3) Subwoofer has little output.
A) Input level control is set too low.
B) If using high level inputs, right and left
channels are connected out of phase.
Check wiring.
4) Subwoofer output is distorted at high
A) Volume of subwoofer is too high,
causing amplifier to be over driven.
Reduce setting of input level control.
B) Signal from receiver, amplifier, or
preamplifier is distorted from being over
driven. Reduce main system volume or
bass tone control.
C) Subwoofer electronics are defective.
Return unit for repair.
5) Subwoofer output is distorted at low
A) Signal from receiver, amplifier, or
preamplifier is distorted from defective
B) Signal connecting wires to subwoofer
are shorted. Check wiring.
C) Subwoofer electronics are defective.
Return unit for repair.
6) Subwoofer makes hum or buzzing
A) Grounding problem or ground loop
condition. Check wiring.
B) Isolate problem by removing all
connecting cables and turning up
subwoofer input level control. If noise is
still present, subwoofer electronics are
defective. Return unit for repair.
After you have connected your subwoofer, adjusted it for proper operation with the
rest of your system, and experimented to find the best location for it, it’s time to sit
back and enjoy it. As you do, here are some hints for getting the most out of your
A) The subwoofer’s level control is designed to adjust the balance between your
subwoofer and main stereo speakers and should not be used as a substitute
for the bass or loudness controls on your amplifier or receiver. If more bass is
desired, advance the bass or loudness controls on your main amplifier or receiver.
B) Your subwoofer’s auto turn-on-turn-off feature allows “set it and forget it”
operation by keeping the electronics in a standby mode until a signal is detected,
which turns the amplifier on instantly. When there is no signal present after a
few minutes, the electronics will again shut down to the standby mode. We do
suggest that you turn the subwoofer off by its power switch if it is to be unused
for an extended period of time. For additional protection against damage from
lightning, we recommend unplugging the line cord.
C) The tone controls on your preamplifier, receiver, or amplifier should be
used with caution and care. Excessive boost in certain frequency ranges can
cause heavy demands on amplifier and loudspeaker components resulting in
overheating, distortion, mechanical overload, and premature failure.
Table of Contents
Introduction ........................................................................2
Unpacking/pre-installation instructions ..............................3
Explanation of features and controls .................................4
Placement or positioning ...................................................6
Wiring and connections .....................................................7
Your subwoofer is finished in a durable vinyl and may be wiped clean with a damp
cloth as needed when the power switch is turned off.
Set-up and adjustment .................................................... 11
Operation .........................................................................12
Care and cleaning ...........................................................12
In case of trouble .............................................................13
... on your purchase of a MTX powered home subwoofer system. Your new
subwoofer is one of the most exciting home entertainment electronic products
available, adding impact and realism to recorded music and the wide variety of
movies to be found on videotape, laser disc, DVD and off-the-air broadcasts.
After you have selected an initial location for your subwoofer and have connected
it into your system, have a seat in your normal listening position and have
someone help you with the following adjustments:
Once set-up and properly adjusted, it should give you many years of
entertainment pleasure.
A) If you are using the line level inputs and your main speakers are receiving
a full range signal, set the subwoofer crossover frequency control to its full
counterclockwise position of 60 Hz.
Your subwoofer is a high value product built in America using the latest materials,
technology, and equipment by MTX, a vertically integrated company.
Thank you for selecting MTX in making your audio equipment purchase.
B) Set the polarity switch to the “normal” position and the level control to the full
counterclockwise position at “minimum”.
C) Turn off the loudness control and set the bass tone control on your main
amplifier to the flat position.
Your new subwoofer has many features which help to deliver its great bass
performance and make it a remarkable value in home theater products.
D) Use familiar program material that has substantial bass content and play your
main system at a moderate volume level.
* High efficiency amplifier:
Your home subwoofer utilizes a modern class A/B amplifier circuit to produce
high power with a minimum of heat.
* Versatile hook-up and operation:
Your new subwoofer has a variety of input and output connections that make it
easy to set-up and use in almost any stereo or home theatre system.
* Low distortion woofers:
Each woofer uses an overhung voice coil and large excursion suspension to
produce higher sound pressure levels with lower distortion.
* Optimal enclosures:
Each enclosure is designed to match the parameters of its woofer to maximize
performance. Special low noise vents are used for less distortion at the
bottom of the frequency range.
E) Slowly rotate the subwoofer level control clockwise until a good balance is
achieved between the low frequency output of your subwoofer and the mid bass
and upper frequencies from your main speakers.
F) Change the polarity switch from “normal” to “reverse” to determine which
position results in the most overall bass output. Leave the switch in the position
that gives the highest output level.
G Slowly rotate the subwoofer crossover frequency control clockwise to attain
the best blend between the level of the subwoofer and the main speakers in the
midbass crossover region. Advancing the control too far will cause a “boominess”
in the overall sound and will add an unnatural “chesty” quality to male voices.
B) For use with A/V preamps and receivers that have 5.1 channel line level
If your preamplifier or receiver has a single “subwoofer” output or “LFE” output,
connect a shielded cable from the preamplifier output to either one of the
subwoofer line level inputs. Refer to Figure E.
Unpack your new subwoofer carefully, keeping the carton and packing material for
future use. Also, write the serial number in your home records for later reference.
Check the condition of your unit, reporting any damage which may have occurred
in transit to your dealer or shipping company.
The following list of terms with their definitions is offered as a help in
understanding the set-up and operation of your subwoofer.
Crossover (xover) - an electrical filter with lo-pass or hi-pass characteristics
that divides the frequency range into bands of low, middle, or high frequencies to
match the capabilities of specialized loudspeakers like subwoofers that are only
effective at reproducing limited frequency ranges. The crossover frequency is the
frequency where the filter begins to attenuate or reduce the level of the signal.
Full range - refers to signals which cover the entire audio frequency span from 20
Hz to 20 kHz.
Hi-pass - a type of filter circuit that allows high frequencies to pass, while
reducing the level of low frequencies with the transition from high to low occurring
at the crossover frequency. The rate of reduction of the signal is called the
attenuation rate or slope and is measured in decibels (dB) over a change in
frequency of one octave which is a doubling or halving of frequency.
Impedance - the resistance to the flow of current in an alternating current circuit
(such as with music). Line level circuits are typically a high impedance of several
thousand ohms, while speaker level circuits are usually a low impedance of a few
Line level - the type of signal produced at the outputs of preamplifiers, tape
decks, CD players, etc., with a typical value of a volt or less in a high impedance
circuit. Sometimes called low level signals, they are routed using shielded cables
which are usually terminated with RCA phono connectors.
Lo-pass - a type of filter circuit that allows low frequencies to pass, while reducing
the level of high frequencies with the transition from low to high occurring at the
crossover frequency. The rate of reduction is called the attenuation rate or slope
and is measured in decibels (dB) over a change in frequency of one octave which
is a doubling or halving of frequency.
Speaker level - the type of signal produced at the outputs of power amplifiers
that may be many volts in a low impedance circuit. Sometimes called high level
signals, they are routed using two conductor unshielded wire of 18 gauge or
larger. Connections are usually made with stripped ends of wire gripped in spring
loaded terminals.
Installation using line level inputs
Refer to figure A.
A) Using a preamp or receiver with line level outputs.
If a preamplifier output is available on your receiver, or you have a preamplifier,
connect it to the stereo line level RCA type input jacks on your subwoofer. Use
quality shielded cables and connectors. Connect one set of shielded cables from
the preamplifier output to the subwoofer input. Connect a second set of cables
from the subwoofer outputs to the input of the power amplifier for your main stereo
1) Polarity switch: This two position switch allows the best match of acoustic
output between the subwoofer and the main stereo speakers in the region of the
crossover frequency between them. The “normal” position maintains phase from
input to output, the “reverse” position changes polarity or phase by 180 degrees.
2) Power switch: This three position switch controls the power status of the
Off: Turns the unit off.
Auto: Places the unit in the standby mode, in this mode the subwoofer will
automatically turn on when an audio signal is applied to either the high or low
level inputs.
Note: Do not use the tape monitor output from your receiver or preamplifier
because its signal level will not vary with the setting of the preamp volume control.
On: Turns the unit on regardless of whether a signal is present or not.
3) Subwoofer crossover : This rotary control adjusts a variable low pass filter to
set the upper frequency at which the output of the subwoofer begins to roll-off.
Continuously variable from 60 Hz to 160 Hz, it matches the upper frequency
characteristics of the subwoofer to the low frequency response of the main stereo
4) Line level output: These RCA phono jacks provide a line level, stereo output
that tracks the level of the full range signal at the line level or speaker level
input. This output is provided for those wishing to “bi-amplify” their main stereo
5) Line level input: These RCA phono jacks accept a line level full range signal
from the preamplifier output of a receiver or preamplifier. This full range signal is
processed and amplified to power the subwoofer.
6) Speaker level input: These spring loaded terminals for speaker wire accept a
stereo, speaker level, full range signal from a receiver or power amplifier. This
signal is processed and amplified to power the subwoofer.
Power Amplifier
7) Fuse: For continued protection replace fuse with same type and size listed.
8) Level control: This rotary control adjusts the level of the subwoofer and is used
to balance its volume with that of the main stereo speakers.
9) Status LED: This two color light emitting diode shows the status of the
subwoofer electronics. “Red” indicates that the amplifier is plugged in and
the power switch is either off or in standby mode with no input signal present.
“Green” indicates that the amplifier is operating with signal present at the input
from the preamplifier, receiver, or power amplifier.
Speaker Speaker
B) For amplifiers with two sets of speaker connections.
An alternate method of connecting your subwoofer and main speakers is possible
if you have a receiver or amplifier that can accommodate two sets of speakers
that can be switched on at the same time and be connected in parallel. (Note that
some receivers and amplifiers connect “A” and “B” sets of speakers in series, not
parallel. A series wiring will not allow this alternate connection method for your
subwoofer. Consult the owner’s manual for your receiver or amplifier to find out
which type of connection is used for “A” and “B” sets of speakers.)
Make one set of connections from the “A” speaker outputs of your receiver
or amplifier to the speaker level inputs of your subwoofer and another set of
connections from the “B” speaker outputs of your receiver or amplifier to your
main stereo speakers. Switch both “A” and “B” speakers to the “on” position. Refer
to figure C.
+ +
Power Amplifier
Your new subwoofer will work well in a variety of locations. However, placement
in your listening room will affect its performance. Since the wavelengths of sound
reproduced by your subwoofer are large compared to its size, those sounds are
omni-directional in nature. This means that locating your subwoofer in relation
to your left and right main speakers will not affect the directional cues which they
Because the sounds you hear are a combination of direct sound from the speaker
and reflected sound from the walls, ceiling, and floor of your listening room,
placement of the subwoofer in relation to room boundaries changes the balance
of what you hear at low frequencies. In that low frequency range, the dimensions
of most rooms are comparable to the wavelengths of those sounds. As sound
propagates and reflects in the room, “standing waves” are created at frequencies
where the wavelength of sound or multiples of the wavelength are equal to one
of the dimensions of the room. At your listening position, these standing wave
patterns of reflected sound add together in and out of phase causing large
variations in the response that you hear.
As a general rule, locating your subwoofer near the corner of the room will
increase its overall output, but will excite more standing waves in the room and
may result in a more uneven response. Locating your subwoofer along a wall
will usually mean less acoustic output but a somewhat smoother response. A
middle of the room location would suggest the smoothest response with the least
output capability. Of course, any location will be a compromise between acoustic
performance and the aesthetic blend of the subwoofer enclosure with the decor
and furnishings of your room. Don’t be afraid to experiment with the location of
your subwoofer in your room for the best results at your listening position. As with
any other listening test, use program material that you are familiar with that has
substantial bass content.
Turn off all power to your subwoofer and other equipment before making
any connections.
Installation using speaker level inputs
A) For amplifiers with one set of speaker connections.
If a preamplifier output connection is not available on your amplifier or receiver,
your subwoofer can be connected using your equipment’s speaker outputs.
These connections are made using commonly available 18 or 16 gauge lamp cord
or speaker hook-up wire. Observe correct polarity by connecting red(+) to red(+)
and black(-) to black(-) for both left and right channels. Connect your amplifiers
speaker output terminals to the subwoofer’s speaker level input terminals as well
as to your main stereo speakers according to figure B.
Power Amplifier
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