HELP USB to DAC = Loud Bursts of Volume

In the recent past I used a Mac G-5 wireless to Airport Express. When my wife used the Microwave to cook something I would get a loss of signal. Weird! Other than that Airport Express never gave me a problem.

Is your Airport Express encrypted? Someone may be trying at access your network. Can you connect the Macbook directly to the DAC? If you can see if it happens again. Also go the apple.com and check the FAQ's, see if anyone else has had issues with the Airport Express.

Good luck

I have exactly the same set up, and exactly the same issues.

I can only tell you that each time this has happened, I've touched
the MacBook Pro, and received a sometimes barely perceptible static
shock ( but sometimes the static shock was very perceptible and almost
lit up the room! ).

I intend to contact the nice people at Bel Canto about this
for their advice. If I reach them before you do, I will file a report here.

It is *very* disconcerting, and I was afraid each time that I might
have damaged my speakers.

Can you recall any of the actions/symptoms I've outlined above?

It has only happened when connected via USB and while music was playing. Once you mentioned static a light went off. I am sure that at least two of the times this has happened, it was as I touched the MB Pro, and I distinctly remember static electricity. I immediately killed the music because I was concerned for my speakers.

It makes perfect sense to me now, because before I upgraded to the Pro, I had a Macbook for a few weeks. The issue never happened as the Macbook uses plastic casing.

I will call Bel Canto again tomorrow and ask for Matt and I will make sure to mention that I am not the only one having this problem. Hopefully they can resolve this issue. I have resulted to using the Airport Express again, not that it sounds bad, but I prefer the USB set-up since the general consensus is that is sounds better than using the AE.

A follow-up to my previous post, which is awaiting approval ...

This sudden volume 'up' has nothing to do with which tracks
happen to be playing, or wireless, or anything else, I'm 99% sure.
It's happened to me at least a half-dozen times, and only at
moments when I've touched the MacBook Pro, while music
is playing.

I do think it might have something to do with the MacBook Pro's
aluminum casing, and a build-up of static electricity. But that's
only my best guess at the moment.

It really is the darndest, and strangest, and scariest thing.

Tweeters still intact, so far,

Michaelct

Guys - if Bel Canto fails to provide satisfaction, you might consider trying the Opticis USB cable. This is a fibre optic cable that lives between the USB output and the USB input. Net effect is that it provides complete electrical isolation between the computer and the DAC - meaning that it might be a way around your static issues.

I would be pleasantly surprised if Apple acknowledged this problem, but some of the Mac tech sites might have some coverage.