I'm very pleased with this underseat sub. I use it in a Kenwood audio system, meaning the rest of the speakers and the player are of the same manufacturer. Although is small, the sub is very loud and punchy. At least for my 50 years old ears, the 3 mode active EQ switch is of little use. Doesn't make any bass difference or maybe I didn't test it enough. Frequency and Volume control do all the job. I use it in a little BMW E46 Touring. Thus, one could imagine the volume of the car. I recommend the product and the seller. Fast delivery, product as described.