Just put 4 new speakers (these) in tonight. I was hoping to improve the overall sound quality.

The sound is much worse. The highs are better, but the lows are really bad. When cranked, the speakers hardly move.

I was actually impressed by the sound of the stock speakers, but the ones I've bought should be quite better. I'm a bit stumped. It's possible that it's the amp, but how could the amp have made the stock whizzer cones sound relatively good?

Any idea of what's going on here and if there is any fix? The way I bought these speakers would make it pretty much impossible to return, and buying a new head unit isn't an option...if I can't improve it then I'm just gonna put the stock ones back in, sell the Kenwoods, and cut my losses.