Thank you for the replies, it is much appreciated.

I found the receiver specs for the SONY STR-GX6ESII...

8-ohm load, both channels driven, from 20-20,000 Hz, rated 100 watts per channel minimum RMS power...Dynamic Power Output 140 watts + 140 watts (8 ohms, at 1 kHz IHF), 190 watts + 190 watts (4 ohms, at 1 kHz IHF).

Unfortunately the receiver does not have a Pre Out or sub out. Will I take any kind of a performance hit using the high level input on the sub?