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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™ 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 PQ40.2, 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 PQ40.2 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-cross™ 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 tweeters 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.