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Fuzzy white noise sound coming from tweeter?

Hi everyone, I just bought a floor demo model of the B&W 702 S2 paired with a demo model of the Rotel RA-1592 integrated amplifier and connected with Rocket 11 speaker cables. I noticed there is a quiet static or white noise sound coming from the tweeter on both speakers. It does not seem to increase in volume when I turn the volume up and I cannot hear it much from where I sit, but it is very pronounced when I put my ear up to the tweeter while playing a song. The noise is also there when I pause the song and apparently anytime the amplifier is on. The speakers are not bi-wired. I was told that maybe this could be caused by intereference with power cords but I moved all the wires away from eachother and the problem still persists. I have also tried playing movies from a bluray player via optical cord and that is also having the same issue. Could this have anyting to do with the break-in period? It is not overwhelmingly noticable from where I sit but I think it is slightly masking the clarity of the high frequencies. I would try to isolate the issue using other speakers/amplifiers/cables but I do not have any others to subsitute in. If anyone has any ideas or suggestions I would greatly appreciate it!
km1181
4 responses Add your response
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georgehifi's avatar
georgehifi
10,312 posts
 
Well first of all you have to isolate the fault to either the amp or speakers so therefor do you have a friend who can loan you and amp so you would be able to hook up the speaker to and see if the hiss still comes through.
He has "it doesn’t go up or down with volume" that means it’s the poweramp section of the Rotel that is noisy on both channels, needs to be looked at, tweeters are fine.
With these figure it should be quiet
S/N RATIO (IHF "A" Weighted)
Line Level Inputs: 103dB Digital Inputs: 102dB

Cheers George
arcticdeth's avatar
arcticdeth
1,572 posts
 
Dirty electrical. 
  Try a. Jam session at 3-4 am, see if it’s still there. 
  Try cables and different stuff. 
  Does the sound play when only amp on?

 Or does the sound go louder when the pre is turned on.

  
jim204
881 posts
 
Well first of all you have to isolate the fault to either the amp or speakers so therefor do you have a friend who can loan you and amp so you would be able to hook up the speaker to and see if the hiss still comes through.
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