Second the Parasound BUT you would not want to send the LFE channel to your main speakers. Instead you would want to set your main speakers to LARGE in the set-up menu and your subwoofer to NONE. If you do in fact have a subwoofer you could simply amplify your main speakers with something like a Parasound HCA-1000 and use the loop outputs to feed the sub a stereo signal. Assuming your sub is placed right and of decent quality you will get the desired affect.
Good luck!
Good luck!