I would say something complementary about it or having it and then mention that you you have a system and were able to improve the sound by doing X. The trick is to be tactful, interested, and helpful and offer some evidence of your knowledge and that big improvements are possible without being a Hilroy or being condescending or critical. Human nature is that someone coming in acting superior or condescending to you will ruffle your feathers and close off communication. It is all in the approach. But it offers a great opportunity to start discussing something your are passionate about and offer some assistance.