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 your subwoofer. On the P450.2, the AC502 will control the
level of the low-pass output of the 3/4 crossover. If the 1/2 crossover switch is in the 3/4 position the 1/2
level will also be controlled. You can use P450.2 as a bridged two channel subwooofer amplifier this way.
On the P650.2 the AC502 will control the level of the low-pass output of the 5/6 crossover. On the
P850.2 the AC502 will control the level of the low-pass output of the 7/8 crossover. To use this feature,
simply connect the AC502 into the DIN connector on the Powerplate and install the AC502 in the desired
location. 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.
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