No suround Sound Playing Out Of Rear Speaker's

On My ' Harman / Kardon AVR 20 Dolby Pro Logic Surround 5.1 AV

Receiver '.

There Is Not Any Sound Playing Out Of The Surround Sound's Right &

Left Rear Speaker's. But When I Press The 'TEST' Button The Tone Is

Heard Just Fine Through The Left & Right Front Speaker's & Also The

Center Chanel Speaker, But The Rear Surround Sound Speaker's Play's

The Test Tone At A Very Low Volume.

The User's Manual Say's On The Original Remote Control ( Which I

Don't Have ) You Can Adjust The Rear Speaker's Volume With The

Remote Control. Is This The Only Way The Rear Surround Sound

Speaker's Can Be Adjusted.