I have just started using this with my Roland kit in a large Christmas show. It really is good, and comparable to the the much more expensive Porter and Davis BC system. It has adjustable volume and low pass filter so you can set it to your liking. The quality of the product is nice, and what you would expect from a Pearl collaboration. Basically it really gives you the feel of the music, and some how it does actually help the bass freq become louder in the ears. One great benefit of this type if system is that it stops you feeling you need to hit the bass drum so hard and so helps add fitness to playing, plus you are less likely to cause yourself an injury from over working you foot/leg joints. Previous I actually had a sub woofer to sit on to create the same effect, however this interferes with the sound too much and is much bulkier to carry around than this nice little red unit.