R6Rocket718 said:
This is the sign of a good set of speakers. If you're using a bad recording, you're gonna hear it. If you're using a Sheffield or Telarc recording, you will know why you spent the money on a good pair of speakers.
It could also be your sound settings.
What kind of processing (stereo) are you using? Where is the HPF set at on it, where is the HPF set on the amp?
If you'd like to see some good midbass from your mids, don't cross them over any higher than 80hz. 60hz would be better.
After you deaden your doors the increase in midbass will be very noticeable.
It's in the install, Boston Pro's are good speakers, and I feel the PRS comps are as good as them. Read this review of the PRS comps.
http://www.caraudiomag.com/testreports/0612_caep_pioneer_premier_ts_c720prs/
If your thoughts on these speakers don't match the author of that article, your install needs more work. If you are running off the stock headunit, I'd rec. getting a Pioneer DEH-P880PRS.
There are better options now than the IDQ, but they are a nice SQ sub. If you like the IDQ, the ARC 10D4(or 10D2 depending on your ohm load) is a better version of the IDQ.
To fill up air space, I'd use wood blocks and wood glue.