I'm fond of Infinity Reference and Kappa lines of speakers. They have wonderful high end, and reasonable mid to mid low. The sensitivity and the Infinity tweeter are strong selling points. IMHO one of the best bang for your buck in auto speakers. My Tacoma which had a very nice system with two power amps and a pair of 12" Subs was all Infinity. You will definitely get better high end, and I would certainly imagine a good bump in volume due to the sensitivity. There's no question that aftermarket speakers will offer an improvement in the overall sound as compared to the anemic speakers that came stock with the Clarity. (I hope that nothing I have said prior would lead anyone to believe otherwise) The discussion about powered low end woofers was specifically about someone asking about improving bass response.