Ive heard some Xplode'*, and didnt like them much at all....not to mention they were blown within a week (powered by a Sony Xplode cd deck)
JBL - i dunno, never heard these.
Kenwood - a good brand, just never heard their speakers either.
Now i have a pair of Mtx 3way 6x9'* and they are great, was running a sincle 12" JL sub with a 600W amp that bumped okay, and they 6x9'* easily overcame the bass, and could hear them loud and clear (also hardly any distortion) - this was in a lowered nissan single cab truck.
Next im going for a pair of Kickers 6x9'*....i hear they are real good.
theres soooo many to choose from, just Please dont waist your money on any Sony speakers...