Damage is done, your amp may or may not have clipped at one time but I bet your teeter is in need of replacement.
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No way the amp is clipping. Could be the tweeter or the amp/preamp. I assume its in one tweeter only? If so switch the speaker wires to the speakers and see if thre crackle follows, if so its the tweeter probably (or tweeter crossover).
Could be the volume pot, or any number of shorts, parts, you didn't mention if you had a preamp. Sometimes the volume pot has crud in it at higher volume settings of the rotation that causes just such a problem, just (unplug for a while) and blast it with some contact cleaner.
I tend to agree with Chadnliz, sounds like your tweeter got fried. Maybe you could hook up your Oppo CD player to a friend's equipment and see if you have the same problem, then you will know it's the CD player. Personally, I have never heard of any CD player as being the culprit in these types of situations, it's usually the power amp.
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.
Do you have any other source that you can try? If you have the same issue when using another pair of speakers, and you've ruled out the pre-amp, that only leaves the source (Oppo) or the amp. If you have a tuner, receiver with pre-outs, iPod or some other unit with RCA line outs, you could try it and rule out the source and/or isolate the issue to the amp. If you try another source and don't hear the problem, you know it was the previous source (Oppo). If you still have the problem, then it would seem to be the amp.