I use this pair of speakers for 4 years and there's not much to complain about. 500W RMS into 4 ohms, 50 to 16kHz bandwidth. Very good output level, thanks to double 38 slamming hard. I never had much of her in the ass of my QCS USA 900 with these speakers, and I've tried a few: TSB Range, Peavy Eurosys ... there ever photo.
The sound is excellent as a low-high level: clear, slamming, accurate. I served as speakers at home, to the front with my group or to host parties as DJ.Ca may lack a little depth in the bass (double 38 does not replace a sub) but to On the other hand it also comes from the amp. They are lightweight and compact speakers for this format I lug around all my stuff in a corsa or a 206.
The price / quality ratio is very correct. It's an investment that I have never regretted.