The manuals posted on Soundstream's website say the 405s will run 2 ohm x 4 stereo, and 2 ohm x 1 for the sub. The 405 specs say 4 ohm x 4 stereo, and 2 ohm for the sub. I have 2 ohm soundstream spl components, coaxials, and subs and I want one amp but dont think I need a 705. The 405s seems...