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Old 28th November 2012, 07:41 AM   #5691
Julf is online now Julf  Europe
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Quote:
Originally Posted by robbbby View Post
With the source hooked up to the amps input I still get the white noise though, should it not be silent if the source has an output impedance of less than 1k ohm?
Even with the source turned off? And unplugged? That would indicate that the output circuitry (or cabling) inside your source is picking up the noise. Is the DAC placed near anything that could be causing electrical noise?
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Old 28th November 2012, 12:08 PM   #5692
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Originally Posted by Julf View Post
Even with the source turned off? And unplugged? That would indicate that the output circuitry (or cabling) inside your source is picking up the noise. Is the DAC placed near anything that could be causing electrical noise?
Julf, did not try it with the dac off, will do that when I get home from work.

The dac is sitting on the amp for my subwoofer for my 5.1 setup but that amp is never on unless i'm watching a movie.
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Old 28th November 2012, 12:27 PM   #5693
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that's weird.
have you ever used the Mytek with other electronics? have you checked with headphones (I see it has a headphone out)? when you connected the 1k resistor at the input, was it after a cable run or directly at the board connector (or XLR in)? so far what you're writing is implying that this a result of NCORE+Mytek interaction. how about some pics? that might avoid a long forum ping-pong game.
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Last edited by mr_push_pull; 28th November 2012 at 12:32 PM.
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Old 28th November 2012, 12:32 PM   #5694
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Originally Posted by mr_push_pull View Post
how about some pics? that might avoid a long forum ping-pong.
robbbby posted some pics Here
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Old 28th November 2012, 12:34 PM   #5695
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Originally Posted by robbbby View Post
Julf, did not try it with the dac off, will do that when I get home from work.
Looking forward to hearing how that goes!

Quote:
The dac is sitting on the amp for my subwoofer for my 5.1 setup but that amp is never on unless i'm watching a movie.
But the 5.1 amp is still plugged in? It might still have parts of the power supply and logic circuits "alive" even when in stand-by/"off".

Just to be sure (and I might have asked this before), is everything powered from the same power outlet?
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Old 28th November 2012, 09:39 PM   #5696
robbbby is offline robbbby  Canada
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Originally Posted by Julf View Post
Looking forward to hearing how that goes!

But the 5.1 amp is still plugged in? It might still have parts of the power supply and logic circuits "alive" even when in stand-by/"off".

Just to be sure (and I might have asked this before), is everything powered from the same power outlet?

Ok, with the dac output plugged into the ncore but leaving the dac off I still have the tiniest bit of white noise. I have to very close to hear it, but honestly it is very little.
However, when the dac is powered up then all the very audible white noise comes back and so do the loud pops on power up/down of the amp.

The amp the dac was/is sitting on is not powered up at all, I have a furman "power conditioner" (really just a surge protector), that takes a 12V input to power on some plugs that powers up the subwoofer amp, so that amp never has power unless my 5.1 amp is on.

With regards to the outlets, the amps are plugged directly into the wall to a 20amp dedicated circuit.
The DAC has been plugged into those same outlets, plugged into a different circuit, has been plugged into the furman power conditioner/surge protector which was on the 20A ncore circuit and also plugged into the furman which was plugged into a different circuit. Every combination yielded the same result.


Quote:
Originally Posted by mr_push_pull
have you ever used the Mytek with other electronics? have you checked with headphones (I see it has a headphone out)?
No I have not, probably worth trying.

Quote:
when you connected the 1k resistor at the input, was it after a cable run or directly at the board connector (or XLR in)? so far what you're writing is implying that this a result of NCORE+Mytek interaction. how about some pics? that might avoid a long forum ping-pong game.
The 1k resistor was added at the end of the input cable. I grabbed a male xlr connectors, soldered the resistor to the xlr and plugged it into the back of my amps female xlr input.
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Old 29th November 2012, 06:24 AM   #5697
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Originally Posted by robbbby View Post
Ok, with the dac output plugged into the ncore but leaving the dac off I still have the tiniest bit of white noise. I have to very close to hear it, but honestly it is very little.
However, when the dac is powered up then all the very audible white noise comes back and so do the loud pops on power up/down of the amp.
OK, so we have proven that the problem is the DAC, not the amp.

Any chance of borrowing an audio isolation transformer?

Quote:
The 1k resistor was added at the end of the input cable. I grabbed a male xlr connectors, soldered the resistor to the xlr and plugged it into the back of my amps female xlr input.
Good way to do it.
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Old 29th November 2012, 12:13 PM   #5698
robbbby is offline robbbby  Canada
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Originally Posted by Julf View Post
OK, so we have proven that the problem is the DAC, not the amp.

Any chance of borrowing an audio isolation transformer?
I don't know what an audio isolation transformer is so probably not. Is it something costly to purchase?
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Old 29th November 2012, 12:37 PM   #5699
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Nope can be very cheap, try googling "DI box", be careful to select one that uses xformers and look at the F response / distortion, look for passive ones.

Something likes this should work: http://artproaudio.com/art_products/...duct/dual_rdb/ Just an example!
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Last edited by Mark.Clappers; 29th November 2012 at 12:50 PM.
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Old 29th November 2012, 12:55 PM   #5700
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Originally Posted by Mark.Clappers View Post
Nope can be very cheap, try googling "DI box", be careful to select one that uses xformers and look at the F response / distortion, look for passive ones.

Something likes this should work: ART Pro Audio Just an example!
Indeed. And that one has the benefit of providing -20 dB of attenuation to better match the gains in your setup (ideally you want -10 dB). The downside is that that one has single-ended input jacks.

Here is another: Whirlwind ISO-XL Line Isolation Transformer - it is XLR to XLR, but no attenuation.

The big brand name is Jensen, pricey, and I haven't found a suitable XLR-to-XLR, balanced 1:5 one in their range.

But before you buy anything, I would try to borrow one (or rent one from a pro audio / music store) to see if it actually helps.
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