I'm hard pressed to call those speaker "low end". Memphis makes some of the best stuff you can get, and those are good speakers. the 6x9'* take 60 watts RMS...the 4x6'*, you really can't get them that take a lot.
I'm looking for speakers to top off this:
Amp : MTX Thunder 3401 - 400 watts RMS
Sub: Kicker L5 - 450 watts rms
Head unit: Panasonic CQ-7301U
How about these for the rear? http://www.crutchfield.com/*-vdvZGYp...00&I=107MMC690
Could you give me suggestions on speakers if the above ones suck?