a/d/s/ PQ40.2 - Manual (Page 7)

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.
Using the AC502 (optional)
The AC502 remote level control, available as an accessory from your a/d/s/ dealer, may be used with
your PowerPlate
TM 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.
tuning
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 bi-
amping 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 high-
pass 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.
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:
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/ PowerPlates
TM
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
System 1 – PQ40 used in 4-channel mode with front and rear full range speakers.
6 17