I tend to agree that it doesn't sound like your speakers, especially if the tape doesn't do it at the same type of volumes. It sounds like the CD is overloading the input of the preamp, or if the CD player is too close to one of the speakers, it could be affected by the vibration and create a weird type of distorted "feedback". Try moving the speakers farther away from it and see if the problem gets better some.
Are my speakers blown???
I have slowly began to notice that my stereo sounds badly distorted (crackling), mainly in the tweeters of my Alon1's, at a medium to high volume. I REALLY noticed it when I replaced my ancient Sonographe CD player with a Rega Planet. It sounds wonderful at lower levels, but can't handle loudness. I suspect that my Conrad Johnson PV10A (pre-amp) may need new tubes. I am not a techie, so I'm guessing. Amp being used is a BK ST1400 (older). The wierd thing is, my Nak tape deck does not cause any noticable distortion. I aslo suspect that the Planet has a higher output level and a greater freq range than the tape player. I really appreciate everyone's help!!!! Brad - Atlanta