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Horrible 60 Hz
Horrible 60 Hz
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Old 15th July 2012, 08:13 PM   #1
tvrgeek is offline tvrgeek  United States
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Default Horrible 60 Hz

Setting up my portable speaker measurement for field use, as in not in my office, but back yard, friends, etc. Picked up a M-Audio Solo box off the auction real cheap. Problem is, horrible 60 Hz hum. I mean like -60 dB. If I held on to it and touched ground, it would drop 10 dB. Wrapped it with foil duct tape. Gained 15 dB in hum rejection. Not great, but puts me in the useable range. I remember I had an external Audgey box and it too I had to wrap. My M-Audio ProFire is clean as can be.

Any other tricks would be appreciated. I guess a steel box would help.
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Old 15th July 2012, 09:21 PM   #2
whizgeek is offline whizgeek  Ireland
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Join Date: Feb 2010
Are you powering this from the Firewire bus or externally?
I presume its a laptop connected to run this. Many laptops cannot provide enough power from firewire port. Try a different power supply, try on battery only, also try with no ground on the power input.
Otherwise I rarely come across a mains powered pc thats quiet enough to measure with.
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Old 15th July 2012, 09:35 PM   #3
Pano is offline Pano  United States
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Location: SW Florida
Horrible 60 Hz
The noise floor in my USB powered M-Audio cards is way down, like -130dBfs Only the tiniest peaks at 60Hz. Does running the laptop on battery help?
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Old 16th July 2012, 11:10 PM   #4
tvrgeek is offline tvrgeek  United States
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Join Date: Dec 2009
Location: Md
This is not by big Profire. It works fine and is powered by my desktop. It happens to be in a steel box. This is my little old version (no phantom power) Fast Track box, USB powered plastic box unit. Laptop is only line powered at this time. It quit charging batteries. Good thought. The ProFire does have provision for external power. I might try that and see if I can eek out a few more dB. I have had quite a time getting my test bench clean enough. Which box do you have Pano?
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