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speaker hiss with audio aero capitole mkII

I have noticed a hiss from my egglestonworks andraII speakers that is noticeable from the listening position at the highest volume settings on the audio aero capitole mkII. The hissing comes from both the tweeter and the twin mid-range drivers from both speakers and is equal from both sp's. It gradually increases as the volume is turned up and is not present with the capitole turned off and the Krell fpb 300cx on. I have dedicated circuits with their own main panel and the capitole is connected to a PS audio P-300. The hiss is present also when the capitole is not connected to the P-300. I suspect that this relates to intrinsic noise or distortion in the capitole, possibly from the tubed analog output. Although the system sounds terrific, i am concerned that the hissing may be masking low level detail at moderate to high listening volumes. Has anybody had a similar experience with the capitole? Can this be improved? Any suggestions? Thanks.

Rafael
aponter4

Showing 5 responses by unclejeff

unclejeff
1,313 posts
 
My AA Mark II is perfectly quiet when run through my McIntosh Tebe receiver and when run through my other tubed amps. Hve tried running the AA through another amp?

If you have a really good rapport with your local high end audio shop, try bringing the AA down to them and try it on a couple of amps. Just remember, there is a skrew holding the transport in place that is meant to snap if the AA Mark II is bumped during, say, shipment. The problem is easy to repair, but might be a bummer of a new problem.
unclejeff
1,313 posts
 
So, we have here yet another AA Mark II beliver. Yes, the thing can be tempermental, but we do love it!
unclejeff
1,313 posts
 
Have you reversed your speaker connections st see if the problem moves with the change. Then, try it again with your other connections. If the problem changes "downstream" it might not be the Cd player.
unclejeff
1,313 posts
 
One more suggestion. Try reversing the connections at the Capitole. See if the hiss follows. Also, do you have XLR connections? Trying a different output (XLR) might tell you if this problem is just in the terminal, or a least somewhere past the DAC. When you have tried all of the above, call Globe Audio. They are very helpful. I don't have globe's phone number handy; it is an '800' number. You can find it by doing a search for 'Globe Audio'.

I do suggest all possible tests before calling. The more you can tell them, the better the help.

Good Luck!
unclejeff
1,313 posts
 
Interesting thought. Perhaps reversing the tubes will answer the question. Also, it could be possible--although a remote one--that one of the tubes just needs to be tightened.
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