I am using Onkyo TX-NR607 receiver along with polk RM87 surrounds and PSW111 Subwoofer. The speakers sound great, but the subwoofer is a very quiet even at Max volume on sub and receiver.
My connection is from receiver to LFE in on subwoofer via Monster THX cable.
I ran audessy setup twice with no improvement. I have manually adjust LFE level on the receiver as well - also to no avail.
I then hooked up an old SONY sub (previously part of a cheap HTIB) using the same cable and same receiver input. The bass was much fuller using this 10 year old sub.
Perhaps I am doing something wrong, but I also wonder if the Polk Sub is defective. Has anyone heard of similar problems?