actually Jensen isn't that bad. I have a VM9512 and it's never messed up on me and resolution is as good as a pioneer that I've had. the only thing is the preouts are weak so a line driver will more-than-likely be necessary.
a line driver increases the rms voltage of your signal sent from the rca outputs on your headunit. the jensen are only 2 volts rms, i have a line driver that does 7 volts so that i don't have to crank the gain on your amp.