I was looking for something to help pump out a little more volume while keeping my two underseat subs, which means having a big amp is out of the question. I chose this because it was compact and hide it behind the headunit. It really boost the Midrange and Tremble up, everything sounds clearer with them. Only issue is that I lost half of my bass, even with the 2 underseat subs. I manage to get a little back tweaking the system but not all of it.This is a cheap way of amping up the stock headunit, usually playing about 25-35 volume before, it is now about 17-25. It does bring out the stock speakers for sure.