OK - to answer your original question - don't bother upping the voltage. Not worth the trouble. You will only get a small fractional percentage increase which means nothing, and the other guy will never see it.
Yes, you can increase voltage slightly to lower the amp's IMD, but even that is not significant, and not worth the bother.
Run your amp at 13.8 VDC and be done with it. If you want more power, get a bigger amp. Besides, I don't like RM's amps as they are all basically low-drive amps. My basic amp of choice is the 4 X 2879 (or it's mosfet equivalent). Anything else is a waste of time and $$$.
Yes, you can increase voltage slightly to lower the amp's IMD, but even that is not significant, and not worth the bother.
Run your amp at 13.8 VDC and be done with it. If you want more power, get a bigger amp. Besides, I don't like RM's amps as they are all basically low-drive amps. My basic amp of choice is the 4 X 2879 (or it's mosfet equivalent). Anything else is a waste of time and $$$.