Fooljam is partly right. The JL amp is the weakest part of the systems.
1) It's 9 million times better than stock amps
2) The differences between amps are compressed into a much tighter window than the differences between speakers.
We have no problem acknowledging that the XD amps are not as high-performance as, say, the Arc Mini series (which is not Class D). But there aren't many 6-channel options, and the XD doesn't suck. It just doesnt' sound as good as a $800 or $1000 6-channel amp that's bigger.
Musicar Certified audio upgrades
OE-Look Enclosures for F10/F30/F32/F22/etc
Add-A-Sub and Full-Bass Packages
Full Cabin 3W and 4W Upgrades
F10 Level Three Add-A-Sub