I have a 5 channel pyle amplifier (4 X 250, 400 X 1). The amp is not 2 ohm stable but I wish to hook up two subwoofers to the 400 X 1 Channel. I believe my only alternative is to hook up two (8 ohm) subs wired so the amp see's a 4 ohm load. In this mode I am assuming my subs would see a max RMS of 200 watts per speaker. Are there any other alternatives?