Mcodanti -
Thanks for the suggestions. Actually, I know my original post was a little ambiguous because I talked about bringing line levels up higher, but what I really meant was bringing up the line levels of the low-level input from the receiver. I'm not using the high level speaker line inputs on the sub. Maybe I should try using the high level inputs in the manner you suggested. Actually, I have an old integrated amp with one side blown that I could use to amplify my low-level input, and then feed that into the high level inputs on the sub, split with a Y-connector as you suggest.
