MTX Thunder 4250D Car Amp

Pros: Compact and Clean Class D Circuitry
Cons: No Markings on the Gain, Boost, and Crossover adjustments.

After adding my new head unit to my SUV, I soon found my mids and highs in a concert of their own. My Alpine 6x9s and front stock component setup couldn't produce enough bass when driven from the head unit(27W x 4 RMS) alone. So I followed the age-old...

Pros: Class D amp, small and compact, RCA inputs *AND* outputs
Cons: remote bass controller sold separately

Ok, I wanted to get this amp because it was recommended by a circuit city salesperson and because it was a brand-name amp. I was originally gonna use it to power a 12" alpine sub, which I was also planning on purchasing. When it came time for checkout, I...