distortion on U-dimension ProX 420.4

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i got distortion on all my 4 channel at high frequencies!:bawling: cracking sound when pavarotti do his magic. no its not the speakers, other amp seem fine with my speaker, even tried it on dynaudio tweeters.

what's the possible reason for this? im sending it for repairs, but i love this amp, and it looks so complicated inside:confused: im abit worried that it falls in the wrong hand:bigeyes:

wish to get some ideas from you guys so hopefully i can tell the technician roughly what to look for rather then tearing it apart:whazzat:

yea probably he got some ideas too, hmm....am i paranoid?:dodgy:
 
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