Here's an easy troubleshooting step.
Plug your Oppo's L&R analog outputs directly into the Belles Amplifier. Turn the Oppo on, press the volume down button on the Oppo remote about 20 times to insure the built-in digital variable volume is set to a very low level. Turn on the Belles and play a tune. Once a CD is playing, gradually turn up the Opp's volume using the volume up button on the remote.
The Oppo has variable volume built-in, so you can bypass the pre-amp as a test. Actually, if you have a single source, you don't even need a pre-amp. Try it. If the problem goes away, its the pre-amp. If the problem still exist, try a different source or a different amplifier if you have one or can borrow one.
Enjoy,
TIC
Plug your Oppo's L&R analog outputs directly into the Belles Amplifier. Turn the Oppo on, press the volume down button on the Oppo remote about 20 times to insure the built-in digital variable volume is set to a very low level. Turn on the Belles and play a tune. Once a CD is playing, gradually turn up the Opp's volume using the volume up button on the remote.
The Oppo has variable volume built-in, so you can bypass the pre-amp as a test. Actually, if you have a single source, you don't even need a pre-amp. Try it. If the problem goes away, its the pre-amp. If the problem still exist, try a different source or a different amplifier if you have one or can borrow one.
Enjoy,
TIC