Summary: These speakers are a steal! The 4 way system provides really clean crisp mids and treble. The low end is slightly lacking, but that's to be expected from having such pronounced mids and highs. I'm using my Kenwood head unit to power them. They work great! Pair these speakers with a sub and you will not regret it!
Summary: If you're looking for something that will provide a lot of good bass, look elsewhere. Although the bass from these speakers were clear, it's very anemic. You pretty much have to max out the bass on the EQ if you want to get even a decent amount of bass. Definitely an issue if you're into bass heavy music. The mid range is okay, nothing special here. The high notes are done pretty decently for the price.
Summary: Excellent Lows, Loud mid-range and Crisp Highs These speakers are the best sounding 6x9 I have ever heard, and I did my research when shopping. The price did not break my wallet either. They can get loud and bump hard with no distortion, big difference from my factory speakers. Sorry, I could not tell you how they would handle on an amplifier.