I just finished hooking up the speakers to my Pioneer VSX-510 reciever. Anyway, I ran the test tone and all the speakers seem to be at the same volume, however, when immersed in a movie I find the surrounds are very hard to hear. I turned them up a little(they now sound louder on the test tone) but they seem to be at the right level in movies. Aside from that, I am VERY happy with the sound from my new audio setup! Very clear and powerful.