yeah JBL are good kit, very good, maybe even too good ( careful you dont blow anything!) they have a habit of underrating their kit, which makes a change from most suppliers overrating stuff, this is fine if your spks are JBL as they too will also be underrated.
the problem is this, say the JBL amp is rated 100w rms and some JBL speakers rated 100 w rms will go together well and be very loud and quality but you get the same JBL 100w rms amp on some other 100w rms rated spks and it will kill them.
kenwood amps and stuff in general ( cept their cheeper HU's) are ment to be good too though.
In phase, ive seen their stuff before and im nearly 100% sure they are a side company of vibe and generally rebrand last years vibe stock with their name, which is fine because it pretty much gives you an inside look at some discounted vibe stuff!
vibe cannot make speakers to save their lives! subs and amps yeah, but speakers, no! every set of vibe speakers ive had have blown tweeters very quickly, they are loud which is why I (foolishly!) keep going back.
I could be wrong but their stuff looks pretty much identicle and I know it wouldnt be the first time audio manufacturers have done this.