The CDR220 has a built in amplifier. I believe it's 18w/channel for 2 fronts and 2 rears. The brown harness that you can get from becker (and usually comes stock with the rear speaker kit) is wired for 4 out of 8 pins for the rear speakers. Technically you can wire the remaining 4 pins for another set of speakers - these were intended for the fronts. So, I guess if you have an existing amplifier, you can add two sets of speakers wired directly to the CDR220. I am sure others will chime in to verify or rebuke. Good luck.
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