I had the same problem. Was using the Air Matrix when I changed CD players (went from Cary 303/200 to MF Nu-Vista 3DCD). The Air Matrix were well-burned in and were still somewhat bright when I used them with the Cary. But, my ears were aching after I used 'em with the MF. I initially attributed it to necessary break-in on the MF, but the brightness remained. I then switched to a pair of Transparent Links (for connections to CD and amp) and the brightness was gone. I've tried other ICs in the system which are not silver over copper and there's no brightness.
I think system synergy is extremely important, as my experience shows. Interesting side note ... my tape deck (Nakamichi DR-8) was sounding a bit dull so I used the Air Matrix on the tape deck. WOW! Tape never sounded so good - great detail and palpable bottom end. You really DO have to experiment with ICs to get the sound that's right for your ears.
I think system synergy is extremely important, as my experience shows. Interesting side note ... my tape deck (Nakamichi DR-8) was sounding a bit dull so I used the Air Matrix on the tape deck. WOW! Tape never sounded so good - great detail and palpable bottom end. You really DO have to experiment with ICs to get the sound that's right for your ears.