Owner`s Manual - Preference Audio

Owner`s Manual - Preference Audio
OWNER'S MANUAL
P-1200
FREE-STANDING
POWERED
300 Watt Powered Subwoofer
12" E X T R A L O N G –T H R O W
Heavy Duty Woofer
Twin Port Design
I M P O RTA NT S A F E T Y I N S T R U C T I O N S
»» Read these instructions.
»» Keep these instructions.
»» Heed all warnings.
»» Follow all instructions.
»» Do not use this apparatus near water.
»» Clean only with dry cloth.
»» Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
»» Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
»» Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding type plug has two blades and a third grounding prong.
The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your
outlet, consult an electrician for replacement of the obsolete outlet.
»» Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles,
and the point where they exit from the apparatus.
»» Only use attachments/accessories specified by the manufacturer.
»» Unplug this apparatus during lightning storms or when unused for long periods of time.
»» Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate
normally, or has been dropped.
»» WARNING: To reduce the risk of fire or electric shock, this apparatus should not be exposed to rain or
moisture and objects filled with liquids, such as vases, should not be placed on this apparatus.
»» To completely disconnect this equipment from the mains, disconnect the power supply cord plug from
the receptacle.
»» The mains plug of the power supply cord shall remain readily operable.
WA R N I N G
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.
P-1200
OWNER’S MANUAL
CAUTION
!
The exclamation point within an
equilateral triangle is intended to alert the
user to the presence of important operating
and maintenance (servicing) instructions in the
literature accompanying the product.
2
Preference
P-1200
®
OWNER’S MANUAL
CONTENTS
I M P O R TA N T S A F E T Y I N S T R U C T I O N S YO U R P- 1 2 0 0 P O W E R E D S U BW O O F E R AT T A C H I N G T H E F E E T F E AT U R E S CONNECTION
2
3
4 4-5
5-7
SETUP
Placement P-1200 Controls
Fine Tuning the Controls
S P E C I F I C AT I O N S APPENDIX 8 - 10
8
9
9 - 10
10
11
Y O U R P- 1 2 0 0 P O W E R E D S U B W O O F E R
Thank you for purchasing the P-1200 powered subwoofer. Your subwoofer has been developed to
provide you with pleasing accurate bass in your music system or home theater sound system.
This manual covers operating procedures, general setup, and technical specifications for your P-1200. We
recommend that you thoroughly read through the material contained in this manual before connecting your
subwoofer. This will ensure that you have a complete understanding of how to setup and operate your
subwoofer properly for optimum performance. Thank you again for choosing the P-1200, and we hope that
you enjoy the enhanced dimension that a fine subwoofer adds to the sonic experience.
Box Contents:
Subwoofer
P-1200
(4) Spiked Feet OWNER’S MANUAL
(4) Knurled Lock Nuts
(4) Rubber Feet
Power Cord
Manual &
Warranty Card
3
AT TA C H I N G T H E F E E T
After reviewing the manual and unpacking your P-1200 subwoofer, we suggest that the four rubber feet be
installed on the bottom of the enclosure to protect the subwoofer and your floor or cabinetry from damage during
installation and setup. These feet can be replaced by the spikes, or removed if desired, after the final location is
determined. Here are some guidelines for using the feet.
»» DO NOT try to slide your subwoofer with the feet installed. This will damage the foot supports or the feet.
»» If the P-1200 is placed on carpet, the spikes are likely the best choice since they will penetrate the carpet and provide a solid and stable footing for the subwoofer.
»» If the unit is placed on a hard surface then the rubber feet should be used.
»» You may elect to use only three feet especially if the surface on which you are placing the subwoofer is
uneven, such as a stone or tile floor. See diagram for details.
To install the feet:
Thread the knurled jam nuts onto the desired feet and then screw the feet into the appropriate holes on the
bottom of the P-1200 enclosure. Begin with the feet screwed all the way into the enclosure. Rotate the enclosure
into its upright position and lower the appropriate feet to level the subwoofer and prevent it from rocking. Finger
tighten the knurled jam nuts against the bottom of the enclosure to secure the feet and prevent them from
moving. Use care not to over-tighten the knurled jam nuts as they will be difficult to loosen.
Front of Subwoofer
Bottom of Subwoofer
Showing (4) Rubber Feet
Front of Subwoofer
Front of Subwoofer
Front of Subwoofer
Bottom of Subwoofer
Showing (3) Rubber Feet
Bottom of Subwoofer
Showing (4) Spiked Feet
Bottom of Subwoofer
Showing (3) Spiked Feet
F E AT U R E S
»» The P-1200 subwoofer was designed for exceptional performance and value. It features a 12” extra-long
excursion woofer with high Bl motor. The bass reflex enclosure ensures extended bass response and high
acoustic efficiency.
»» The woofer is driven with an integral 300W class A/B amplifier utilizing the patented BASH technology for
high electrical efficiency.
»» The integral rear-mounted 300 watt amplifier includes several essential controls to contour the subwoofer’s
output to blend with virtually all loudspeakers and room environments. These controls, their operation, and
their adjustment are described in a later section of this manual.
»» An integral low pass crossover network is continuously-variable from 40Hz to 120Hz and can be bypassed if
it is preferable to use an external crossover located in an outboard receiver or processor.
»» The P-1200’s integral amplifier incorporates a defeatable signal-sensing circuit that automatically powers
up the amplifier when a signal is detected.
»» A double-insulated isolated-ground electrical supply prevents electrical ground loops and reduces the noise
floor of the entire audio system.
»» The P-1200 is shipped with 8 adjustable feet, (4 spiked and 4 rubber) with tool-less knurled jam nuts.
These feet can be installed in the bottom of the enclosure in either a three-point triangular pattern or more
traditional 4 point square pattern. The bottom of the enclosure has 5 threaded inserts arranged to accept
either pattern.
P-1200
OWNER’S MANUAL
4
1
2
3
4
!
RISQUE DE CHOC ELETRIQUE
NE PAS OUVRIR
5
6
U.S. Patent #5,075,634 and
5,510,753 Patent Pending
10
9
8
7
1 Power and Standby Mode Indicator – Off=No Power; Green=On; Red=Standby
2 Auto Power Mode Switch – Selects if amplifier power is signal activated; On=Signal Sensing, Off=Bypassed (Amp ON)
3 Level Control – Adjusts output level of subwoofer
4 Phase Control – Adjusts relative alignment of output signal with respect to the input; 0°=In Phase, 180°=Out of Phase
5 Crossover Frequency Control – Adjusts low pass filter cutoff frequency
6 Crossover Bypass Switch – Selects if internal crossover (low pass filter) is active; Variable=Active, Bypass=Inactive
7 Line Level Input – Input connection for RCA Line Level signals from processor or preamp; Includes LFE & Sub signals
8 Speaker Level Input – Input connection for High Level signals from amplifier
9 Power Input Receptacle and Fuse Holder – IEC 2-conductor 120V receptacle accepts supplied IEC power cord
10 Master (Main) Power Switch – Primary power; On=Power Enabled; OFF=Power disconnected from amplifier circuit
CONNECTION
No signal connection cable is provided with the P-1200 subwoofer since the type and length of cable is installation
specific. A shielded RCA type coaxial cable, a shielded two-conductor wire with RCA type connectors, or a
2-channel speaker cable is required for connection of the P-1200 to the audio system. Ensure sufficient length to
reach from the system source to the subwoofer’s line or speaker level input. If you are uncertain about the type and
length of wire to purchase after reading this section and the section on Placement then please contact your dealer
for assistance.
Before making any connections, ensure that the power cord is disconnected or that the main power switch is
switched to the off position.
Input Signal: Follow the diagram on page 7 for connecting the subwoofer to your audio system. Use the option
that best suits your installation. WARNING: Use only one of the three options, (Do Not Combine Options). The
information below will aid in determining which option to use.
Note: The best performance can be achieved using the line level inputs ( OPTION 2 or OPTION 3 ) as opposed to the
speaker level inputs ( OPTION 1 ).
P-1200
OWNER’S MANUAL
5
CONNECTION
(continued)
Please refer to "Initial Settings" chart in the Appendix at the end of this manual before fine tuning the P-1200.
OPTION 1
If a Line Level signal, (Stereo Left/Right, LFE, Sub Out, etc) is available then skip to options 2 and 3 to see if
they are more appropriate for your installation.
If no line level output signal is available then the subwoofer should be connected in parallel with the main
speakers per the Option 1 drawing. A description is provided below.
■■ Per the Option 1 drawing on the adjacent page, use two 2-conductor speaker cables and connect
the left and right front speaker outputs of your receiver or amplifier to the Speaker Level inputs of
the P-1200 as you would connect a pair of speakers. Use care to ensure that the proper polarity is
observed (R+ is connected to R+ of P-1200, R- is connected to R- of P-1200, etc). Failure to do so will
result in little to no subwoofer output or erratic output.
■■ If a (B) speaker output is available (unutilized) it can be used in place of making a parallel connection
at the receiver but this will only work if the amplifier utilizes an internal parallel connection of the
(A) and (B) speaker pairs. Use the following test to determine if this is the case.
Test for Parallel (A) and (B) connection:
Ensure that a pair of speakers is connected to the (A) output and that nothing is connected to the (B)
speakers. Engage the (B) speaker output while an audio source is playing through the (A) speakers. If the
(A) speakers continue to play then the connections are parallel and you may use the (B) output for the
subwoofer. If the (A) speakers discontinue playing when the (B) output is engaged then you will need to
connect the subwoofer in parallel to the (A) speaker outputs.
OPTION 2
If an LFE (Low Frequency Effect) or Subwoofer output is available then skip to Option 3 since it will likely
produce the best results. If no LFE output is available and a line level Front Channel Output or Preamplifier
Output is available, then this (Option 2) is the preferred method of connection.
■■ Per the Option 2 drawing on the adjacent page, use a stereo RCA style (patch) cable and connect the
left and right line level (RCA style) main channel outputs of your receiver or preamplifier/processor to
the Left/Right Line Level inputs of the P-1200.
OPTION 3
If the subwoofer is connected to a modern home theater receiver or processor with an available LFE or
Subwoofer output then this option will likely produce the best results. If no LFE or Subwoofer output is
available but a line level Front Channel Output or Preamplifier Output is available, then use Option 2.
■■ Per the Option 3 drawing on the adjacent page, use a single RCA style (patch) cable and connect the
line level (RCA style) LFE or Subwoofer output of your receiver or preamplifier/processor to the Left/
LFE Line Level input of the P-1200.
AC Power: The unit is shipped with a standard IEC AC cable. Remove this cable from its packaging and insert
the cord into the IEC receptacle on the back of the subwoofer. It is best to connect power only after all other
connections are made. Connect the power cord to an AC wall receptacle or similar.
P-1200
OWNER’S MANUAL
6
C O N N E C T I O N VIDEO
AUDIO
PRE OUT
SINGLE
(continued)
CENTER
VIDEO
L
S-VIDEO
R
IN
DVD
CD
ANTENNA
DVD
IN
VCR
VCR
OUT
L
AM
FRONT A
R
OUT
FRONT SURROUND.
SPEAKERS
SURROUND
CENTER
L
R
SUR.
BACK
SUB
WOOFER
SURROUND BACK / BI-AMP
R
L
AC OUTLETS
GND
FM
75 Ω
UNBAL
REMOTE
OUT
SPEAKERS
L
FRONT A
PRE OUT
SINGLE
R
CENTER
L
R
FRONT SURROUND.
SUR.
BACK
SUB
WOOFER
Line Level
input
Speaker Level Input
Line Level
input
Left/
LFE
Left/
LFE
Right
Right
Right
Left
OPTION 1
OPTION 2
OPTION 3
!
P-1200
OWNER’S MANUAL
7
SETUP
Placement
There are a number of factors, both acoustic and aesthetic, that ultimately determine the best loudspeaker
placement. Subwoofers, by nature of the frequency range in which they operate, have their own challenges, which
have as much to do with the room acoustics and listening position as anything else. In many cases the designated
location may already be chosen and the only available adjustments may be the subwoofer’s controls. The P-1200
controls will allow you to make the best of virtually any installation. If you feel uncomfortable with setting up your
P-1200 after reading through this section then you should consider enlisting the help of an experienced person or
contacting your dealer.
Below are some generalized rules for understanding the acoustic nature of low frequency sound reproduction in an
average residential listening room. These rules will aid in the placement and tuning of your P-1200 subwoofer. If
possible, experiment with the placement of your P-1200 to determine what works best in your listening room.
■■ Most rooms have significant resonant modes at low frequencies. The listener will experience these resonant
modes as a variation in the intensity of certain frequencies at different locations within the room. Resonant
modes are the result of reflected acoustic energy interacting within a room’s boundaries. The resonant
modes can produce large errors in the frequency response and reduce the overall enjoyment of the audio
reproduction. Equalization cannot simultaneously compensate for all locations within a room. However,
physical elements within or at the room’s boundaries can effectively improve the room’s behavior. Subwoofer
placement also has an effect on the excitation of the resonant modes and the way they are experienced.
Contacting an expert in the field of acoustics can be worthwhile if one finds that the low frequency
reproduction in their room is unsatisfactory or if one wants assistance in optimizing their installation.
■■ Placing a subwoofer on the floor near a wall will increase its radiating power by as much as 2X. Placing a
subwoofer on the floor near the intersection of two walls (a corner) will increase its radiating power by as much
as 4X. Corner loading, as it is sometimes called, is an excellent way to get bass extension and greater acoustic
output from a subwoofer especially at very low frequencies.
■■ In the same way that the subwoofer’s output is augmented by a corner, the listening position can also have a
significant effect on how the bass is experienced. Sitting at a room’s boundary, such as near the back wall of a
room, will significantly increase the bass level across much of the low frequency spectrum.
■■ Placing a subwoofer close to the listening position (less than 5ft (1.5m)) can increase the intensity of the
transients and reduce the acoustic power demands from the subwoofer in some installations. In others, it
can increase the power demands if the woofer is placed at a primary node. Placing a subwoofer(s) close to the
listening position can also create more tactile sensation.
■■ Bass frequencies below about 80Hz are considered to be omnidirectional and tend to have no localization.
That is to say that it is difficult to determine their place of origin. For this reason, placement of most
subwoofers is not limited to the front of the room. However, in practice this is not always the case. There are
cues such as tactile and audible vibration and higher frequency signal content that can suggest the direction
of the source. For this reason it may be desirable to locate the subwoofer(s) at the front of the room. It
may also be necessary to reduce the crossover frequency below 80Hz if one finds that the bass sounds too
detached from the other sound sources.
■■ Placing a subwoofer(s) at the back of the room is also a consideration especially if placement of a subwoofer
at the front of the room is not suitable or produces poor results. Placement directly behind or beside the
listening position can produce very good results as well as corner loading in the back of the room. Other
options include placing the subwoofer(s) on the side(s) of the room especially when multiple woofers are used.
If possible experiment with different positions. Don’t exclude the possibilities of locating your subwoofer in
walls, ceilings, floors, or underneath, beside, and behind furniture.
■■ Symmetrically or asymmetrically locating two or more woofers in the room can be done to reduce room mode
effects and to balance the localization of the sound.
■■ It is not necessary to direct the front of a subwoofer at the listening position.
P-1200
OWNER’S MANUAL
8
S E T U P (continued)
P-1200 Controls
The P-1200 subwoofer has thee variable controls for tailoring its output to the room and to the primary speakers
(also known as satellites). These controls are Level, Crossover Frequency, and Phase. The control with the most
audible effect is the Level control, followed by the Crossover Frequency, and then the Phase control, which has the
least audible effect.
The following legend shows graphically how each control affects the audio signal.
SPL
(dB)
SPL
(dB)
Frequency (Hz)
Level SPL
(dB)
Frequency (Hz)
Phase (Degrees)
Crossover Frequency Phase
Note: SPL is “Sound Pressure Level” (Volume)
Fine Tuning the Controls
Please refer to "Initial Settings" chart in the Appendix at the end of this manual before fine tuning the P-1200.
Level and Frequency
A. Begin with the subwoofer’s Level control set to the middle (12 O'clock) position and the Frequency
adjustment set to 120Hz. With the Frequency control in this position the woofer will output higher
frequencies that will likely be duplicated by the satellite speakers. “Satellite speakers” is a term used to
describe the primary listening speakers that cover the frequency range above the subwoofer’s.
B. Use familiar music with strong bass content and adjust the Level control until the bass passages sound
robust or slightly exaggerated. Then reduce the Frequency control to blend the subwoofer with your main
system speakers. We have found that most speakers with 6” to 8” woofers blend well with the crossover set
somewhere between 60Hz and 80Hz.
C. Readjust the Level and the Frequency controls (up or down) as necessary until the bass sounds full,
extended, and natural. Use multiple musical pieces to test the system while fine tuning the controls. If it
sounds like your subwoofer is always producing the same bass note with different recordings it is possible
that the bass level is adjusted too high.
Phase
A. Begin with the Phase control set to 0 degrees (fully counter-clockwise). Leave the control in this position if
the subwoofer is connected to a home theater receiver or processor that has room-correction digital signal
processing (DSP).
B. When adjusting the phase, use familiar music with strong bass content. The phase adjustment primarily
affects the frequencies where the subwoofer and the satellite speakers overlap (frequencies near the
crossover frequency).
C. Rotate the phase across its range and listen to the balance and strength of the mid-bass frequencies. Tune
the phase adjustment so that these frequencies are detailed and distinct. If they become overly strong it
may be necessary to reduce the subwoofer’s crossover frequency and/or input level a little. The effect of the
phase adjustment can be subtle and it may be necessary to take some time to become acquainted with the
sound before changing the adjustment.
P-1200
OWNER’S MANUAL
9
SETUP
(continued)
Fine Tuning the Controls (continued)
Crossover Switch
If you choose to bypass the internal crossover and use an external crossover, such as those located in most
modern receivers and processors, then you will need to fine tune the system based on the adjustments
provided by the manufacturer of your electronics in conjunction with the Level and Phase controls on the
P-1200. Note, the Level and Phase adjustments on the P-1200 are not bypassed and will still function as
indicated above.
To bypass the internal crossover, move the Crossover switch 6 to the Bypass position. The subwoofer will
now pass signals up to approximately 300Hz.
Auto Power Mode Switch
The P-1200 contains a circuit that automatically powers up the amplifier when a signal is detected. The
same circuit also places the P-1200 into standby mode when no signal has been detected for a period of
approximately 10 minutes. This signal sensing circuit can be bypassed by switching the Auto switch 2 to
the OFF position if it is preferable to control the P-1200’s power with a remotely operated power source.
S P E C I F I C AT I O N S
Frequency Response: 25Hz – 300Hz (System Response)
Crossover Frequency:
40Hz – 120Hz (Low-pass filter with bypass switch)
Phase Adjustment:
0 – 180 degrees (Continuously variable)
Amplifier Output Power:
300 watts, with thermal and clipping limiters
Audio Inputs:
Summing stereo line level (RCA x2)
LFE (RCA shared with Left input connector)
Speaker level (Stereo 5-way binding post)
Input Impedance:
Line Level – 20k ohms, Unbalanced
Speaker Level – 220 ohms
Input Power: 120V 60Hz AC
Input Power Connection:
IEC 2-wire receptacle with integral fuse holder
Power (Mains) Fuse:
3.15A 250V T3.15AL (5x20mm) style Slow Blow
Power Modes:
Auto signal sensing and always on
Auto Off Delay:
~10 minutes
Dimensions:
15-3/8”W x 17-5/16”H x 14-3/4”D, (390W x 440H x 375D)mm (without feet)
Weight:
43lbs (19.5kg)
Shipping Dimensions:
21”W x 20”H x 20”D, (533W x 508H x 508D)mm
Shipping Weight:
51lbs (23.2kg)
P-1200
OWNER’S MANUAL
10
APPENDIX
Initial Settings
These are the recommended control settings that should be used as a starting-point when configuring your
P-1200. Please refer to Pages 9 and 10 of this manual for more information on “Fine Tuning the Controls.”
Option1 utilizes the speaker-level connections and is typically used with two-channel audio systems.
Option2 utilizes the line-level connections and is typically used with two-channel audio systems.
Option3 utilizes the LFE/subwoofer connection and is typically used with Home Theater systems.
Level
Crossover Freq.
Phase
Crossover Switch
P-1200
OWNER’S MANUAL
OPTION 1
OPTION 2
OPTION 3
Middle (12 O'clock)
Middle (12 O'clock)
Middle (12 O'clock)
120Hz
120Hz
N/A
0 Degrees
0 Degrees
0 Degrees
Variable
Variable
Bypass
11
P-1200
Preference
®
F R E E - STA N D I N G
P OW E R E D S U BWO O F E R
Rev. A
Note: Specifications are subject to change without notice.
For the most up to date manual information please check our website.
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