[94_AcCoRd_EX]

You need only 1 bass blocker per speaker.... and you'd pick a frequency based on the 652I specs. I have a couple of bazooka tubes, and they really don't sound good. They came in the last car I got, and I just never bought anything else. They aren't horrible, but not good by any means. If you crave bass, or just want good sound, you'll need to get an amp or two.