Bought this to support the bottom end of my pair of Evox J8's at high levels, 'cause they do a great job at low to mid levels, but start to limit when pushed. And there a times at my gigs when I need to push harder than what the J8's are designed for. So once the sub joined the party with the J8's crossovered at 80 hz (H3 preset on the sub) everything is superb in terms of quality of sound and I can reach much higher levels of volume without sacrificing the bass. I found the sweet spot of volume on the sub to be around -9 db to perfectly fit with my J8's, so I have plenty of headroom as well. So at this point - I'm satisfied with my purchase and can consider myself a happy customer. Impeccable service by Thomann! Thank you!