This amp looks remarkably similar to the 250W Sub Amp that Parts Express sells for $130. Check it out before you spend more $$ than you need. The Parts Express spec sheet rates the amp at 180Wrms @ 8 ohm and 250Wrms @ 4 ohm. It is possible the Stryke Audio amp has uprated electronics.

I have a pair of these amps powering a pair of 12" sub cabinets in my listening room. More power than I need to generate really solid, clean bass.