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lol! Yep, all the way out to a theoretical 0.04%!!
Get a couple of RCA Y-cables. Channel 1&2 both get left and bridge for mono left and Channel 3&4 both get right and bridge for mono right. I run my midbass with a 4channel this way
Got it, so basically splitting out the two existing RCA ends into 4 connectors, left side two go to left - channel 1&2 and the right two go to right - channel 3&4
I'll give it a try, since I can't quite see adding additional speakers anyways, so the extra channels in the 4 channel amp would have ended up unused.