You will want this...
Crutchfield Customer Review (What's this?)
Works as advertised. It's nice to be able to set the subwoofer level in your head unit to maximum and then just adjust the gain and crossover with the remote on the fly. Saves time and distraction fiddling with your head unit's settings and menus. It's also fairly inexpensive.
Pros: Fast, remote control of the tube's gain and crossover frequency.
Cons: Didn't come with directions (maybe they were supposed to?) and the birections for the tube mention the remote but do not give details. I ASSUME that you are supposed to set the controls on the tube itself to max and let the remote cut as needed but for all I know the remote bypasses the tube's control pots altogether. Not a huge deal but it would be nice to know.Crutchfield response on June 17, 2014 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.