Most recommendations I've seen for these speakers are in excess of 200W RMS, but Hertz told me 150W would be plenty, they said if you need more, your amp is likely crap (that was maybe not the exact wording, but ......). You could opt for an Audison SRx2S, that is 2 channels and the only price I have seen is 300 US a piece. That will give you 2 x 200W RMS at 4 ohms.