Great things in small packages
I Used two sets of these in a regular cab Chevy truck ,one set in the b-pillars and the other in a set of PODS sealed boxes for four inch speakers. I have them amped with the alpine mrp-f300. The set in the PODS have better mids and even a little bass likely due to the sealed enclosure but that being said they all sound very exceptional for a four inch speaker. The highs are very "crispy" or "bright" and I'm good with that. I love being able to hear a drummer come off the high hat or the chimes over the thumps from the subs. If your looking for a good highs speaker, this will do the trick.
Pros: Great highs, decent mids, works well with and without amp
Cons: Don't expect a lot of bass. Its a four inch speaker.