i have a kinetic 600 and also have a small thump sometimes but i can live with it.i didn't have that thump before i installed the kinetic and i know it's wired correctly.i would like to point out that highs can also benefit from a cap i had a punch 800a2 on my highs and the tweeters were dimming my head lights.caps are still good if you get em cheap you can't have too much currant available it think that's impossible.i also have a 6 farad cap on the way going in the car that has the kinetic,and i have a 1/2 farad under the hood buy the alternator