Soundz recommends 2 amp on and 8 speakers on. That's what mine is flashed as. I have Focal KRC 165 speakers and Arc XDI 600.4 amp. Sounds amazing.
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finally got my flash done and verified its correct (2 amp on 8 speaker on per Peter's instructions) and installed the new system. It sounds awesome, crisp clear music. I haven't had a chance to ride yet but so far its one of the best upgrades I've done.