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Re: EMI

Posted by RioTubes (A) on February 8, 2007 at 07:55:31

In Reply to: EMI posted by Christine Tham on February 7, 2007 at 18:16:51:

What I read John to say is that the average PC and other non audiophile quality devices--including the stock squeezebox--spew out more EMI than other hifi 2-channel audio components sitting in one's audio rack, and this is a concern if hi fidelity is one's goal...which was the context of the question in my post.

key word search "emi" under John returned 4 posts (excerpts below):

"How is the EMI form this device? My mini-ITX system puts out enough EMI that I can't put it next to the rest of the audio omponents (which is fine, I have it next to me, across the room from the audio stuff)."

"BTW I'm running I2S from my SB3 into my DAC using a ribbon cable with standard 3.3V signal levels, but I think I'm going to go with LVDS ovber CAT5, it has lower jitter and much less EMI."

"We also found that the SB3 EMI was causing part of the problem. By wrapping the whole SB3 in aluminum foil the sound significantly improved."

And from the above post: "Different computers spew out different amounts of EMI so its hard to make absolute pronouncements, but I would not put any computer right next to a stereo system. Ultra low EMI computers can certainly be built, but almost everything on the market is shielded just to the point of meeting the FCC regs and no better."

John seems to have gotten better performance out of a SB3 i2s feed relative to his usb efforts, so my conclusion is to take reasonable care in finding ways to reduce emi potential, regardless of device, via distance or reduced transmission (replacing enclosure, etc.).

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