If you're still skeptical , here are 2 referrals to start with, call for surround prepro upgrades.

Raymond Sarno in NY (631) 842-6279 we've done a number of upgrades for Raymond, Classe SSP-800
Richard Nelridge in PA (484) 951-4119 Onkyo 885, NuForce, Denon, Lavry, Audio Research etc, Rich has performed A-B comparisons

Yours in Music,
David J. Schulte
The Upgrade Company - The leader in Hi-Fi upgrades and modifications
1222 Walkabout Lane
Harbor Springs, MI 49740
www.upgradecompany.com