OK, so I am in the same boat and think I have 3 blown speakers.
Here are my questions before I replace everything:
1) I remember someone suggested a cheaper alternative to Dynamat called something like "Breadboard." Is there a quality or durability issue going with the cheaper alternative?
2) It looks like a hole for a 6x9 speaker could be cut into that bracket which, in my novice mind, would give a richer sound. Am I wrong on this?
3) No one has answered about the need (or not) to get an amp. For someone who doesn't need to have anyone but the persons in the VX hear my music, is an amp necessary if I just want a clean sound? Is MOSFET technology built in a head unit a decent alternative?
Thanks in advance for any advice/answers you stereophiles can provide.