Summary: This amp is awesome. The birth sheet that came with the amp rated it to be 623 watts rms at 2 ohms vs the promised rms power of 550 watts rms at 2 ohms. It's a very powerful amp for the price.
Summary: Bought this amp to power a single 2 ohm Dayton Audio RSS315HO-44 12" sub installed in a 1.5 cu ft ported enclosure tuned to 23 Hz. This is a very inefficient speaker (83 db/1w/1m) but the Alpine amp drives it to very high levels effortlessly.