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Computer Audio Asylum Music servers and other computer based digital audio technologies. |
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In Reply to: Re: EMI posted by RioTubes on February 8, 2007 at 07:55:31:
Your excerpts helped a lot.*** 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.). ***
I would certainly agree with this. I would also add that it doesn't hurt to look for ways to improve EMC (electromagnetic compatibility) in all your audio equipment.
Older equipment may not have good EMC, but newer equipment should meet FCC standards which means that in theory the sort of EMI generated by an FCC compliant PC (or any other consumer electronics device that is DSP based) should NOT pose a problem. Particularly since newer PCs implement spread spectrum on the high bandwidth busses (generally memory, graphics) which also help to reduce EMI and newer power supplies have active PFC.
I suspect a factor in John's case (and possibly yours as well) is that on both his Mini-ITX PC and SB3 he's transmitting digital audio signals across components.
The problem is that any cable carrying digital signals is a very strong EMI transmitter (and receiver!). It basically acts as an EMI antenna. Ribbon cables are terrible in this respect. CAT5 is not that great either.
In my case, I have gone for the opposite approach, which is eliminate digital cables where possible. In my setup, I try where possible to do D/A conversion in the source components, and carry analog downstream to the speakers. I'm relying on the EMI shielding in each source component and EMC in downstream components to minimise any issues. I also do a lot of power supply filtering, as that can be a good noise transmitter between devices as well.
If I had to carry digital signals (say, from a PC to an external DAC) I would recommend using quad shield coax cable (plus word clock sync, to reduce jitter).
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Follow Ups
- Thanks - Christine Tham 15:15:38 02/08/07 (0)
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