You may want to search for "DSP" on Renntech. There were quite a few "hits" when I checked.
Here's are a few that may answer your question:
http://www.renntech.org/forums/index.php?showtopic=22521&hl=dsp
http://www.renntech.org/forums/index.php?showtopic=3894&hl=DSP
http://www.renntech.org/forums/index.php?showtopic=13419&hl=dsp
They seem to say you need the controller, the 680 amp and a special wiring harness - pehaps more. I don't think I saw a post from anyone who made it work with a CDR-220 or CDR-22.
There also seemed to be a few folks that, like j.fro, were dissatisfied with the DSP. So you may want to consider your options.
Good luck.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 12-way driver & 8-way passenger seats, Litronics, silver console
Last edited by KevinH1990; 12-04-2009 at 02:03 PM.
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