a/d/s/ PQ40.2 Car Stereo System User Manual

owner's manual
©2001 analog and digital systems, inc.
8900-3110 REV A
analog and digital systems
table of contents
about this manual...................................................................................................
features of your PowerPlate TM..................................................................................
warning and tips.....................................................................................................
mounting locations.................................................................................................
system planning......................................................................................................
signal sources..........................................................................................................
system configurations..............................................................................................
amplifier controls.....................................................................................................
controls and connections.........................................................................................
multi-crossTM crossover and configurations.............................................................
warranty information...............................................................................................
Although it may be hard to remember, back in the 1970’s, car audio as we now know it didn’t really
exist. Sure, music lovers could buy a cassette or 8-track tape deck and some 6” x 9” three-way
speakers. Advanced stereo buffs might even add a “power-booster” to increase output to as much
as 12 watts RMS! But none of this really delivered the power to cut through road noise with sound
quality that compared with the best home audio. Not until 1979 that is, when a/d/s/ introduced the
revolutionary PowerPlate TM P100 amplifier and 300i 2-way plate loudspeakers. Aesthetically, the P100
introduced the low profile design which has been an a/d/s/ trademark to this day. Technologically, the
P100 combined a high efficiency switching power supply with a state-of-the-art, discrete highcurrent stereo power amplifier. For the first time, a car audio system existed with the musical
integrity and dynamic range that made you want to take long drives to nowhere, just to listen to the
music. High quality car audio was born, and the original a/d/s/ PowerPlateTM P100 made it happen.
The latest improvements to the PowerPlateTM line-up include increased heatsink area to facilitate
higher power output, Constant Bass circuit for subwoofer signal that can be mixed into all channels,
and fully balanced high-level inputs compatible with any source. The amplifier you have purchased is
an enhancement of the respected P-series multichannel amplifiers. In this version, we have improved
upon the already acclaimed sound quality by addressing internal details, and upgrading selected
components to incorporate the latest technology which was not available when the P-series was
originally designed. Selected low-noise, high-speed op amps are used in critical circuits. Class A-B
biasing is used throughout the voltage-gain and active crossover stages. Numerous modifications and
“tweaks” were also performed which improve the power supply dynamics and reduce noise. These
changes improve transparency and dynamic linearity, resulting in a smoother and more detailed topend, tighter bass, more explosive dynamic contrasts, and virtually holographic imaging. Left intact are
the P-series unequalled flexibility, high efficiency and superb reliability. These, along with
multichannel design, are fundamental in the a/d/s/ approach to systems engineering, which makes
achieving true high fidelity reproduction simple and predictable in any installation.
There are two things you must do to ensure trouble free service in the event you need warranty repairs.
1. Keep your original sales receipt in a safe place. A copy of the receipt will be required to obtain warranty
2. Be sure your retail dealer has written the date, model number and serial number (if applicable) of the
product on the receipt. To give yourself an extra measure of protection, make a separate record of the
information about your purchase and keep it in a safe place. In the event you misplace the sales receipt,
your dealer may be able to give you a copy.
Take a moment now to read the terms of your warranty. Check to be sure your sales receipt is dated and
has the product model number and serial number (if applicable) on it. Then put it away in a safe place.
When shipping a Product in for service:
Enclose a copy of your original sales receipt that has the date, product model number and serial
number (if applicable) written on it.
Always ship Products in the complete original packing material.
Avoid shipping Products via the postal service. If you must use the postal service, be sure to
register and insure the package.
a/d/s/ Limited Warranty
Analog and Digital System, Inc. (a/d/s/) warrants to the original consumer purchaser of the a/d/s/ Products
described in this manual, that the Product will be free from defects in materials and workmanship for a
period of one (1) year after the date of purchase, if the Product is installed by an authorized a/d/s/ retail
dealer, the warranty is extended to three (3) years. a/d/s/’ sole obligation under the warranty shall be to
provide, without charge, parts and labor necessary to remedy the defects, if any, that appear during the
warranty period.
This warranty is the sole and exclusive express warranty given with respect to the Product. All other express
warranties are hereby excluded. Neither a/d/s/ not the authorized dealer who sells the Product is responsible
for indirect, incidental, or consequential damages. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation or exclusion 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.
IMPORTANT – This warranty does not cover:
Damage that is the result of misuse, abuse, accident (including but not limited to damage by
water), faulty hookup, defective or maladjusted associated equipment, or the use of the Product
with equipment of which it was not intended.
Cosmetic defects that appear more than thirty (3) days after the date of purchase. Cosmetic
damage caused by improper handling is also excluded.
Products that are used for commercial purposes.
The cost of removing or reinstalling the Product.
Damage that occurs while the Product is being shipped to whoever will service it. See the infor
mation above regarding shipping procedures.
This warranty is void if:
The Product identification or serial number is removed or defaced in any way.
The Product is serviced or repaired by anyone other than a/d/s/ or an authorized a/d/s/ dealer or
service agency.
Original sales receipt:
Be sure the retail dealer has written on it the date, model number and serial number (if
applicable) of the Product. This information is required for warranty service.
This warranty is limited to:
Products purchased from authorized a/d/s/ retail dealers in the United States. a/d/s/ will supply a
list of authorized dealers on request.
In order to obtain warranty service you must:
Return the Product, freight prepaid, to the a/d/s/ dealer from which it was purchased, an Authorized a/d/s/ independent service agency, or to a/d/s/., If necessary you may call a/d/s/ Customer
Service Department for the names and address of authorized independent service agencies in your area.
Provide proof of purchase in the form of a copy of your original sales receipt. The date, model
number and serial number (if applicable) of the Product must be written on the sales receipt.
amplifier section
power output 4
about this manual
PQ 40.2
4 channel 4 x 100
2 channel 2 x 300
To get the most from your a/d/s/ PowerPlateTM, we recommend that you have the installation
performed by your qualified authorized a/d/s/ dealer. If this unit is installed by your dealer, we will
extend the warranty to three years instead of the standard one year. However, if you feel that you
have the necessary skills and prefer to perform the installation yourself, this manual will guide you
through the process of installation and set-up. Please read through it completely before beginning
the installation so that you may familiarize yourself with the total procedure before you begin. If
there is anything that you do not fully understand, please consult with your a/d/s/ dealer before
attempting the installation.
power output 2 (watts)2
fuse type
distortion all channels driven
4 x 150
60 A maxi
13” x 16 1/8” x 2”
<0.1% 20Hz to 20,000Hz
frequency response
±1dB 10Hz to 30,000Hz
signal-to-noise ratio full
bandwidth @ rated output power
damping factor @ output
connector full bandwidth
Sustained listening to loud music over 100dB has been shown to cause permanent hearing damage.
Systems using a/d/s/ components are capable of achieving volume levels which substantially exceed
this level. When operating your system for sustained periods at high volume, be sure to use hearing
protection to prevent long-term exposure. We want you to be able to enjoy the music for many more
input sensitivity
100mV to 8Vrms for full output
features of your PowerPlate™
input impedance
47 k
Remote Level Control Capability – Can be used with accessory control AC502 to provide a
dashboard mounted rear channel subwoofer or Constant Bass level control
crossover section3
ch 1 & 2
high-pass 12dB/octave variable 45Hz- 5kHz
ch 3 & 4
high-pass & low-pass 12 octave variable 45Hz- 5kHz
constant bass
low-pass 12dB/octave 30Hz- 300Hz
keep listening, but be safe!
Digital Crossover Frequency Display – The crossover frequency for each channel pair is displayed
on the top of the amplifier for quicker, more precise system tuning
Detachable Plug in Connectors – High current speaker and power connectors simplify installation.
Multi-cross™ Variable Built-in Crossovers – High-pass, Low-pass and Bandpass functions are
built-in, virtually eliminating the need for external crossover networks in even the most elaborate
Constant Bass circuit – Signal from all input channels is summed, low-pass filtered and then made
1 All channels driven, continuous FTC rated 4
voltage at 13.8DVC.
2 All channels driven, continuous FTC rated 2
load, 20Hz to 20,000Hz, <0.1% THD, power input
PowerPlate™ Design – a/d/s/ original low profile, high efficiency heatsink design keeps size to a
minimum and allows mounting where space is limited.
load, 20Hz to 20,000Hz, <0.1% THD, power input
Wide Input Sensitivity Range – Allows connection to virtually any source unit from factory OEM
radios through low output preamps
voltage at 13.8DVC.
3 All channels are selectable with infinitely variable adjustments from 45Hz to 5,000Hz with a slope
of 12dB/octave and a “Q” of .707.
Simultaneous Stereo and Mono – Each channel pair may be used Stereo, Mono, Bridged or both
Stereo and Mono simultaneously. This allows an additional Mono speaker to be used with a stereo
pair for center-channel or subwoofer applications from each channel pair using passive crossovers.
Same Side Adjustments – The P-series PowerPlate™ makes system adjustment easy by organizing
all signal processing controls on one side of the amplifier. This layout allows convenient system
adjustment and facilitates a variety of installation possibilities when access to the controls is desired.
warnings and tips
Always disconnect the battery ground wire before doing any work on your vehicle. Reconnect the
cable only after the installation is complete and the wiring has been checked to make sure that there
are no problems. If your radio features a code type security system, be sure you know the code
before disconnecting the battery!
Your a/d/s/ PowerPlate TM should be installed in 12V negative ground vehicles only. Connection to
other types of electrical systems may cause damage to the vehicle or the amplifier.
Wear Eye and Ear protection when using power tools.
Do not bypass or modify the fuses, or replace with one of a higher rating. The fuse should not fail
under normal operation. Repeated blowing indicates a problem with the amplifier or improper
An additional power supply line fuse (not supplied) must be installed on the 12V supply line and
located as close as possible to the battery in order to protect the wire in the event of a short circuit.
Make sure the system is turned off when making or breaking any connections.
Do not use your PowerPlate TM with speakers which have either terminal connected to the speaker
frame or to the vehicle chassis.
Never operate the vehicle without the PowerPlateTM firmly mounted. An unmounted amplifier can be
a dangerous missile in an accident or abrupt stop.
possible cause
action to take
poor bass response
Speakers wired with wrong
polarity causing cancellation
at low frequencies
check speaker polarity and
repair as needed
crossover set incorrectly
reset crossovers referring to
the multi-cross TM crossover
configuration section of this
manual for detailed
impedance load to amplifier
too low
check speaker impedance
load, if below 2 stereo or
4 mono rewire speakers
to achieve a higher
short in power wire
or incorrect power
check power and ground
connections and repair as
fuse used is smaller than
replace with proper fuse
too much current being
check speaker impedance
load, if below 2 stereo or
4 mono rewire speakers
to achieve a higher
battery fuse blowing
mounting locations
Due to its low profile, there are many possible choices of mounting locations. Always mount the
PowerPlateTM in a place that protects it from the elements. In addition, mount the PowerPlateTM on a
stable, flat mounting surface. Whenever possible, pre-drill the mounting holes. Remember to check
behind the panel for hidden dangers in the form of hoses, fuel or brake lines or electrical wiring. Use
a marking pen or awl to mark the hole locations and pre-drill using a 1/8” bit.
Passenger compartment mounting: All PowerPlates TM have been designed with a low profile to make
under seat mounting possible. Regardless of where you choose to mount your PowerPlateTM be sure
to keep a minimum of 1” of clearance around the amplifier for adequate airflow to prevent
Trunk compartment mounting: The most common mounting location is in the trunk or cargo
compartment. For optimum cooling, mount the PowerPlateTM chassis vertically with the fins running
vertically, or mount the PowerPlateTM horizontally with the fins pointing upward. Avoid horizontal
mounting locations with the fins pointing downward.
Also, locate the PowerPlate TM where it, and connections to it, will not be damaged by cargo or tools
which may shift during vehicle operation.
Engine compartment mounting: Don’t even think about it! The PowerPlateTM was not designed to
endure the harsh chemical and heat environment of the engine compartment. Failure to obey this
warning will void your warranty.
check power and ground
connections and repair as
amplifier fuse blowing
impedance load to amplifier
too low or wired 2 stereo
or 4 mono
check speaker impedance
load, or 4 mono, rewire
speakers to achieve a
higher impedance
short in power wire or
check power and ground
power connections
connections and repair as
fuse used is smaller than
replace with proper fuse
size recommended
too much current being
check speaker impedance
load, if below 2 stereo or
4 mono rewire speaker to
achieve a higher impedance
check power and ground
connections and repair as
no output
audio cycles on and off
system planning
possible cause
low or no remote turn-on
action to take
check remote turn-on
voltage output at amplifier
and correct as needed
fuse blown
check power wire integrity
and reversed polarity, repair
as needed and replace fuse
power wires not connected
ground connections and
check power wire and
repair or replace as needed
audio input not connected
or no output from source
check input connections and
signal integrity, repair or
replace as needed
speaker wires not connected
check speaker wires and
repair or replace as needed
speakers are blown
check system with known
working speaker and repair
or replace speakers as
make sure there is proper
ventilation for amplifier and
improve ventilation as
thermal protection engages
when amplifier heatsink
temperature exceeds 85° C
distorted output
loose or poor audio input
check input connections and
repair or replace as needed
amplifier level sensitivity
set too high; exceeding
maximum output
capability of amplifier
reset gain referring to the
tuning section of the manual
for detailed instructions
impedance load to amplifier
too low
check speaker impedance
load if below 2 stereo or
mono rewire speakers to
achieve a higher impedance
shorted speaker wires
check speaker wire
connections and repair or
replace as needed
speaker not connected to
amplifier properly
check speaker wiring and
repair or replace as needed
refer to the installation quick
reference section of this
manual for detailed
reset crossovers referring to
the for speaker multi-cross™
internal crossover not set
crossover configuration
speakers are blown
section of this manual
check system with known
working speakers and repair
or replace as needed
Proper system planning is the best way to maximize your PowerPlate’s TM performance. By planning your
installation carefully you can avoid situations where the performance or the reliability of your system is
compromised. Your authorized a/d/s/ dealer has been trained to maximize your system’s sonic potential.
Your a/d/s/ dealer is a valuable resource in helping you with your system design and installation.
speaker requirements
Each channel of your PowerPlate can
easily drive 2 Ohm speaker loads when
used in the stereo mode. When a channelpair is bridged, the recommended
minimum load impedance is 4 Ohm. Do
not use speakers or combinations of
speakers that result in less than a 4 Ohm
load when in bridged mode or 2 Ohm in
stereo mode.
Most speakers designed for car audio
operation have in 4 Ohm impedance.
Connecting two such speakers in parallel
will result in a 2 Ohm impedance load as
seen by the amplifier. Some a/d/s/
subwoofer models feature a dual 4 Ohm
voice coil design. Connecting these voice
coils in parallel will result in a 2 Ohm
nominal impedance which is not
recommended for use with bridged
channels of your PowerPlate TM .
signal sources
adjusting input sensitivity
Due to the wide input level adjustment range, all a/d/s/ PowerPlatesTM can be driven with either a
conventional preamplifier drive signal or the amplifier signal from a powered source unit. This makes
the PowerPlateTM perfect for upgrading an OEM (Original Equipment Manufacturer) stereo system while
retaining the factory installed radio.
The input sensitivity setting is important to ensure proper performance, low noise levels, and maximum
system reliability. As a general rule, components at the “front end” of the system should be set as high
as possible with the input sensitivity of the amplifier set as low as possible while still providing adequate
volume levels. Using a high signal level from the source and a low input sensitivity setting on the
amplifier will keep the background noise levels of the system low. The following procedure will help
you get the widest dynamic range from your system:
1. Start with the input level controls of your PowerPlateTM at the minimum (counterclockwise)
Because of the high impedance of the a/d/s/ input stage, the factory radio drives an easy load. This
ensures lower distortion levels than if it was driving speakers or a Line Output Converter accessory. As
a result, a high quality factory installed radio can deliver high quality sound which is nearly as good as
the sound from a high-end aftermarket source unit. The speaker outputs of the factory radio are simply
connected to a mini-DIN adapter as shown below. From this point on, the signal can be treated exactly
as you would a preamp-level signal, except that the input level controls on the PowerPlateTM will be set
to a lower than usual level when you make your final adjustments.
Conventional aftermarket sources may be connected using standard shielded RCA cables from the
source units preamp outputs to the PowerPlateTM inputs.
When using 4 channels of input, be sure to configure the 2ch/4 ch input switch to
4ch input. Failure to do so may result in damage to the source unit.
2. Set the tone controls and any controls on equalizers or other signal processors to their flat or
bypassed positions.
3. Set the input and output level controls, if any, on any associated equipment such as equalizers
or outboard electronic crossover as recommended by their manufacturers.
4. Select a well recorded CD or Tape containing material recorded at a fairly high level. Musical
content is not important except that the music chosen should be recorded such that any
system distortion can be clearly heard, not masked by musical content.
5. Increase the source unit volume control about halfway. Increase the PowerPlateTM level
control associated with the front full range (or midrange in a bi-amplified front system) until
you can hear sound at a low but clear level.
6. While listening carefully for any signs of distortion, slowly increase the source unit volume
control until you either hear the first signs of distortion or you can’t turn it up any more.
Back down on the volume control slightly until the distortion goes away. You have just found
the maximum undistorted output level of your source unit. Do not exceed the level in normal
operation, as doing so will just send a distorted signal to the rest of the system.
7. Returning to the PowerPlateTM level control associated with the front main speakers, slowly
increase it until you reach the point where distortion just begins to appear. This will be at the
point where either the amplifier reaches its maximum output level, or the speakers reach their
output limits. Either way, you have just calibrated the system so that the maximum system out
put occurs at the same point as the maximum output from the source. This will give you
minimum system noise yet the system will reach its maximum output capability.
Pin Wire Color Connects to Head Unit
1 gray front right +
2 violet/black rear right 3 white front left +
4 gray/black front right 5 white/black front left 6 green rear left +
7 green/black rear left 8 violet rear right +
8. Reduce the source unit volume to a comfortable listening level. With the balance and fader
controls still centered, adjust the remaining level controls for the proper system balance. If
you are adjusting a system with multiple amplifiers, it is easiest to adjust the controls in the
following order: 1. Front speakers 2. Rear speakers 3. Subwoofers
9. If using an AC502 remote level control, adjust the subwoofer level with the AC502 in the
mid position. This will give you the ability to boost the subwoofer level approximately 6dB
when the AC502 is turned fully clockwise.
10. Double check your system levels by increasing the source unit volume control to the previously
determined maximum position. If you hear distortion from any of the channels, reduce the
PowerPlateTM input level for those channels until the distortion goes away.
Adjusting the input levels in this way will get maximum undistorted output from your system and will
make it unlikely that you will cause damage to any of the components of your system by overpowering
Constant bass circuit
To mix sub-bass information into channels 1/2 and 3/4, select a low-pass crossover point, and use the
level controls to set the level of sub-bass signal sent to channels 1/2 and 3/4.
The throughput DIN connector allows easy access to Channels 1-4 inputs for routing to additional
amplifiers in your system by using the optional AC202 (DIN to female RCA) or AC207 (DIN to male
RCA) adapter.
DIN throughput connections:
Using the AC502 (optional)
The AC502 remote level control, available as an accessory from your a/d/s/ dealer, may be used with
your PowerPlateTM to remotely adjust the level of channels 3/4, OR to remotely adjust the constant bass
level. To use this feature, simply connect the AC502 into the DIN connector on the PQ40, and install
the AC502 in the desired location. To adjust the constant bass level, Locate the AC502 control switch
on amplifier and push IN, or leave it OUT to control the level of channels 3/4. This remote capability
can also be used on channels 1/2 when the PQ40 is used in the 2-channel bridged mode. Refer to the
“adjustments” section for information on setting up the AC502 for the appropriate adjustment range.
pin 1 ch 4
pin 2 audio signal ground
pin 3 ch 2
pin 4 ch 3
pin 5 ch 1
pin 6 not used
pin 7 not used
pin 8 remote power control
system configurations
All a/d/s/ PowerPlatesTM provide extensive features which make a variety of system configurations
possible. It is not feasible to cover all of the possibilities within the few pages of this manual. There are
a few system configurations, however, which are extremely popular when used alone or as a “building
block” of a larger more elaborate system. Please review systems 1 through 4 described below for
suggestions on how to configure the most popular combinations. Larger systems may be built from a
combination of the simpler building blocks as shown in systems 5 and 6.
button is disengaged
control is non-operational
button is engaged
control is operational
tuning the crossover
All of the crossover controls in the multi-crossTM crossover section are marked at four reference
frequency points. These are 45Hz, 175Hz, 600Hz and 5,000Hz. Specific crossover points should be
chosen based on the operating range recommended by the manufacturer of your speakers. The 85Hz
position is a good starting point to use for subwoofer low-pass or midrange high-pass use. When biamping a/d/s/ loudspeaker components 2500Hz is a good starting point for the midrange low-pass,
and 3500Hz is recommended as the tweeter high-pass. Once installed, you can fine tune the crossover
points using your ears or with the aid of an RTA to achieve maximum performance. With any
loudspeaker, minor deviations from the recommended frequency ranges may provide superior results,
depending on your speaker locations and your vehicle’s acoustics. Setting crossover frequencies higher
than recommended will not cause damage and may provide good results. However, DO NOT set highpass tweeter crossover points below the tweeter’s recommended operating range. Doing so will likely
cause damage not covered by the manufacturer’s warranty. If you are using non-a/d/s/ speakers, refer
to the manufacturer’s recommendation for selecting the proper crossover frequencies.
System 1 – PQ40 used in 4-channel mode with front and rear full range speakers.
System 2 – PQ40 used in 3-channel mode with high-pass main speakers and low-pass subwoofer.
Note: Although shown as 2-channel, the source unit may be either 2 or 4-channel depending on the
setting of the 2/4 channel switch.
digital crossover frequency display
To facilitate quicker system tuning, we have incorporated a digital display that shows the crossover
frequency for each crossover section, including the lowpass crossover for the constant bass circuit.
Push the select switch to scroll through the different sections, and a blue led will indicate which
crossover is currently displayed.
Level controls – Independent level controls for channels 1/2, 3/4 adjust the input
sensitivity from 100 mV to 8 VRMS.
Note: When crossover 3/4 output is selected for channels 1/2, the 3/4 level control adjusts the
output level for channels 1/2 and 3/4 simultaneously.
System 3 – PQ40 used in 4-channel mode with 2 channels high-pass, 2 channels low-pass or
bandpass. Depending on the crossover frequency chosen, this configuration may be used for
satellite/subwoofer operation or to bi-amp a midrange/tweeter combination as shown.
Note: Although shown as 2-channel, the source unit may be either 2 or 4-channel depending on the
setting of the 2/4 channel switch.
Output – Three position switches determine the output configuration. Each stereo pair of channels can
be configured in either stereo, summed-bridged and bridged-mono.
When the switch is in the left position, the output channels are configured
for stereo operation.
When the switch is in the center position, the output channels are configured
for summed mono bridged operation by mixing the left and right input
signals together.
When the switch is in the right position, the output channels are configured
for a bridged mono output using a single RCA input. Ch 1 input is used for
channels 1 & 2 and ch 4 input is used for channels 3 & 4.
Internal signal routing
2-channel/4-channel input switch – routes RCA input from channels 1/2
to channels 3/4. When the switch is engaged,
channel 1 input is routed to both amplifier
channels 1 and 3 with input channel 2 routed to
amplifier channels 2 and 4.
System 4 – PQ40 in 2-channel bridged mode. Commonly used for subwoofers but may also be used
for full range, midbass or midrange applications depending on crossover mode and frequency setting.
Optional: AC502 can be used in this mode.
Switch in the engaged position.
When the switch is disengaged, channels 1, 2, 3,
and 4 receive signal individually from their
respective inputs.
Switch in the disengaged position.
multi-cross crossover configuration
xover control 1/2 The crossover selection for channels 1 & 2 has three possibilities:
When the switch is in the left position, the crossover section of the amplifier is
bypassed. Channels 1 & 2 output is full range.
When the switch is the center position, channels 1 & 2 are filtered through a
12dB per octave high-pass crossover that is infinitely variable from 45Hz to
System 5 – PQ40 used in front high-pass , rear tri-mode operation. Channels 1 & 2 can be configured
for high-pass or full range operation. Rear channel must be configured for full range operation.
Important! Choose passive crossover frequencies for the subwoofer and high-pass speakers
that do not overlap.
When the switch is in the right position, channels 1 & 2 receive signal from the
crossover output of channels 3 & 4. Note: When the switch is in the right
position, the output level is controlled by the ch 3/4 level control.
The crossover sections dedicated for channels 3 & 4 are activated by
depressing the switch next to each frequency adjustment control.
Both high-pass and low-pass crossovers are infinitely adjustable from
45Hz to 5,000Hz. The high-pass and low-pass sections may be used
individually or together to create a bandpass filter.
Note: When using both sections to create a bandpass filter, make sure you have selected a
low-pass frequency which is higher than the high-pass frequency!
System 6 – Two PQ40s, both set up as shown in system 3. One amp drives bi-amped midranges and
tweeters with the second driving rear fill speakers and subwoofers.
speaker connections for stereo configurations
Minimum recommended impedance is 2 Ohm stereo.
Speaker terminals accept up to AWG #12 speaker wire.
speaker connections for bridged configurations
Minimum recommended impedance is 4 Ohm when bridged.
Speaker terminals accept up to 12 gauge speaker wire.
System 7 – Two PQ40s, both set up as in system 2. One amp drives front speakers and one subwoofer
with the second amp driving rear speakers and one subwoofer.
1. Disconnect the battery ground cable. Reconnect the ground cable only after the installation is
complete and the wiring has been checked to make sure that there are no problems. If your
radio features a code type security system, be sure you know the code before disconnecting the
2. Run a minimum AWG #8 power wire directly from the battery to the PowerPlateTM mounting
location. Install a fuseholder at the battery end of this cable either within 18” of the battery or
before the wire runs through any metal partitions. Do not install the fuse at this time.
3. Attach a minimum AWG #8 ground wire to a solid chassis ground point near the mounting loca
tion. Keep this wire as short as possible. Scrape all paint and primer off of the sheet metal at the
ground point to ensure a good electrical connection. Attach the wire to the ground point with a
nut, bolt and star washer. If this doesn’t work, we recommended that a seperate #8 ground be run
back to the battery-terminal.
4. Run the signal leads and remote turn-on leads from the head unit to the PowerPlate™ location.
Refer to the “signal sources” section for the proper wiring connections.
5. Run each of the speaker leads to the PowerPlateTM location. Connect the speaker, remote, and
power wires to the appropriate terminals on the plug-in connectors. Refer to the “controls and
connections” or “system planning” sections for information on the proper connections.
6. Preset the 2/4 channel selector switch, crossover and channel mode switches, and crossover fre
quency switches to the desired positions. Refer to the “controls and connections” section for
more information.
7. Adjust all amplifier input level controls to the 1/4 position to full counter-clockwise, than turn
clockwise 1/4 turn.
8. Mount the amplifier into position and plug in the power and speaker terminals. Attach the input
signal cables.
9. Reattach the battery ground cable.
10. Attach a minimum AWG #8 ground wire from the battery ground terminal to a solid chassis
ground point near the battery. see#3
11. Double check your switch and control settings. Install an 80A fuse in the fuseholder you have
installed near the battery.
12. Turn on the signal source at a low volume level. Using the balance and fader controls, check to
see that each channel is connected to the proper speakers. Make sure that the proper frequency
range is being sent to each speaker if you are using the crossover features built in to your
13. Adjust the input sensitivity and crossover frequencies as described in the “tuning” section.
controls and connections
Use AWG #8 or larger power and ground cable.
Install an 80A fuse in the power wire within 18” of the battery.
Keep the ground wire to a minimum length and attach solidly to a clean metal part of the vehicle. The
addition of a .5 Farad to 1 Farad power supply capacitor, mounted as close as possible to the
PowerPlateT M, may improve
performance in some systems.