Several months ago, I upgraded my 2010 Prius 2 speakers to Alpine SPS-600C components in front and Alpine SPS-600 full range in the rear. They were uncomfortably harsh when running with the factory head unit. I waited in hope that it would improve when I replaced the head unit later. I recently updated the head unit to a Kenwood Excelon KDC-X994. The speakers sound better but still harsh, especially at mid to high volume. Even after aggressive use of the EQ and DSP features, I find that they always sound either harsh or muffled. I just can't get the nice clean warm sound I want. So I'm beginning to think the Alpine SPS-600C is a poor choice for this vehicle. Does anyone else have experience with this combination, or advice for making them sound warmer and less harsh? Perhaps a recommendation for another speaker that I might like better? I'm considering swapping them out for Polk MM6501.