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Old 29th November 2012, 12:06 PM   #5701
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and now you say? I was in need of a readily available solution like that a while back. are there similar isolation boxes for SPDIF/AES-EBU?
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Old 29th November 2012, 12:14 PM   #5702
Julf is offline Julf  Europe
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are there similar isolation boxes for SPDIF/AES-EBU?
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Old 29th November 2012, 02:39 PM   #5703
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Please, don't do that (audio trasfo). they are terrific if not super hight quality, and will destroy all the performance of your set-up. And they are super expensive if high quality.

May-be you have some margin of gain ? Add a resistance bridge or a potentiometer to reduce the volume and so, the noise of the DAC.
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Old 29th November 2012, 02:48 PM   #5704
Julf is offline Julf  Europe
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Please, don't do that (audio trasfo). they are terrific if not super hight quality, and will destroy all the performance of your set-up. And they are super expensive if high quality.
But a cheap or borrowed one is great to try out with to see if it helps.

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May-be you have some margin of gain ? Add a resistance bridge or a potentiometer to reduce the volume and so, the noise of the DAC.
A carbon potentiometer is probably not a great solution either. There is definitely gain margin, I would suggest removing the resistor from the feedback network to drop the gain, but I remember all too well my own fumbling when trying to remove it... OK, someone who takes the time and uses a proper magnifying glass should be able to pull it off without problems.
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Old 29th November 2012, 08:54 PM   #5705
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How do those differ from a resistive based in line attenuator like this?

Sescom Sescom SES-IL-10DB XLR Male to XLR Female In Line Attenuator - 10db Impedance Matching Transformer at Markertek.com
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Old 29th November 2012, 10:25 PM   #5706
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Just wanted to follow up from a prior post regarding issues I having with my NCores. I'd been away for a couple weeks and wasn't able to get around repairs until recently. An employee at Hypex suggested a possible issue with my speaker posts not being isolated properly. I believe this is where the issue lied. Another problem may have been bad contact due to the binding posts being annealed. Lastly I purchased one of these Line-R 1200VA Automatic Voltage Regulator suggested by Bavmiike. In one fell swoop made all changes and hooked them up and they work perfectly. Furthermore I believe the apc voltage regulator has improved them to worthwhile degree. I sexond Bavmiike's observations and recommend it for digital components with SMPSs. Thank you for the suggestions and thought and also thanks to the people of Hypex in their ability to isolate the issue from fairly junky iphone pictures.
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Old 30th November 2012, 06:21 AM   #5707
Julf is offline Julf  Europe
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How do those differ from a resistive based in line attenuator like this?
A resistive attenuator doesn't provide any isolation. A transformer gives galvanic isolation from ground issues, and is pretty good at blocking HF noise too.
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Old 30th November 2012, 07:16 AM   #5708
qusp is offline qusp  Australia
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A resistive attenuator doesn't provide any isolation. A transformer gives galvanic isolation from ground issues, and is pretty good at blocking HF noise too.
for the same reason you have to spend good money on them to get good results, severe bandwidth limitations
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Old 30th November 2012, 07:24 AM   #5709
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robbby, why not try to ask other Mytek users, maybe at computer audiophile? maybe it's a known issue?
my DAC (made by a small local company) had similar issues, made an annoying noise audible even in a less than perfectly quiet room. returned it to the manufacturer and he fixed it, said it was related to some unannounced changes in the output buffer made by the manufacturer (TI). obviously this may have nothing to do with your problems but just sayin'...
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Old 30th November 2012, 07:42 AM   #5710
Julf is offline Julf  Europe
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for the same reason you have to spend good money on them to get good results, severe bandwidth limitations
Most decent ones go to well over 20 kHz...

Again, the reason I am suggesting a cheap one (or getting one on loan) is to see if the galvanic isolation solves the problem.
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