I purchased this because I wanted to compare it to another Bass Restorer that I own thinking that it would not reduce bass in bass heavy songs like the other one did, but it still did. Although not quite as much as the other one. This is a better product than the less expensive ones, and is priced more because of that fact. If you listen to older music or rock, then this exponentially increases bass, and even does so with some rap/hip hop/dance music. Overall, it's better than other bass restorers, and if you listen to older music, it's a must have piece of equipment. I have it hooked up to 2 10" JL W3V3'S and it makes them DANCE BIG TIME. Got a 13W7 on the way, we will see how that works out with it.