I run these speakers off of an Alpine KTP-455 and it is a great match. The highs are nice and bright and the mids and lows are tight and punchy. They get really loud with nice full sound and there is never a hint of being pushed too hard. I don't get much deep bass, but it may be because they are in the side compartment of hatch and not in a trunk. These speakers cannot be beat for the money. Run them with a small amp and they will sing. Sonic Electronix is the only place to buy car audio.

After 6 months the only thing wrong with them is that the mtx stickers on the magnets fell off from the summer heat other than that they are still sounding great.

These are the other set that my girl bought for me along with the 6.5s and together they sound loud and clear. Hopefully I can pair them with an amp and push them to their limits but as of now they are running off the the head unit and even then they sound clean and put out some serious bass. Highly recommended.

I thought they would be decent speakers but i got these and the 5-1/4 and just these made my rear view mirror vibrate. Pretty good bass, and sounds awesome! Quick delivery, too. It was like 4 days.