GS Audio BC-101 (BC-1)

Ruined my signal and made it all sloppy.. Rode on it for a week then took it out. When I took it out, I noticed a big increase in sharpness.

Great if you have a wide variety of musical (and talk radio) taste. Quick, on the fly adjustments. When John B. Wells starts speaking, bass must go.

Works fine as a gain knob, but the crossover doesn't really act as such. It acts like second gain knob. Save money and get a plain gain knob.

Well, this thing is a pretty neat idea. Easily change crossover settings from drivers seat as well as gain. However, i dont believe the settings on the dials are completly accurate. You may have to adjust some on the amp in order to open the range enough for this to take over. On the plus side, install was simple and took 20 mins. Once it's hooked, it does work. Best advice, dont look at the numbers on it while adjusting, use your ears. Overall, for 12 bucks, pretty cool add-on. BTW, get at LEAST a 3 foot rca to go with it, the rca's are its leash, and limit mounting location accordingly.
PROS: easy install, cool gadget, price,
Cons: not 100% accurate, may not last for years.

Perfect for in car use instead of trying to tune off the amp. Best money spent.