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I'm going to toss the challenge flag here regarding the ASK diagram. The have a pdf for a 987.2 Boxster ASK amp (that I am unable to upload) that seems to indicate that the amp feeds all speakers, not just the woofer & center speaker unless the mid/tweeter path is merely a passthru which I would doubt. I was toying with adding the rear speakers to my 987.2 BS (SPP CDR 30) by installing the Cayman ASK amp which has rear outputs. The output connector has different keying but that can be overcome. Haven't gotten past the pondering phase of the project.