I've been looking for an amp for my Infinity RS-IIIb speakers for some time now and have found a Phase Linear DRS-900 Amp, preamp, and tuner for sale locally. He is asking $500 for all three. The amp has been checked by a tech to ensure that everything is working correctly. I've heard that these speakers need a lot of power, around 200 wpc, but the amp is rated at 150 wpc. I think the amp will work fine but if anyone has any advice I would appreciate it. I also don't know a ton about Phase Linear so if I could hear some thoughts on that too. Thanks.