I have an Onkyo TX-SR501 receiver, Velodyne CHT-12 sub, and Polk RTi6 fronts I always go stereo for music, so thats all ya need to know by way of equipment. I tried running a 40 hz test tone from my computer (which is basically my media machine) to my receiver via a mini-to-rca cable. The crossover is set to 80hz on the receiver, and direct on the sub, so as I understand it, all of the low frequency crossover is handled by the receiver, and anything 80hz and below directly to the sub. When I ran the test tone, I was able to hear something very faint coming from my speakers. Is this normal, or should I do some more inspector gadget about whats going on?