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Old 28th July 2012, 08:49 PM   #1781
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Quote:
Originally Posted by barrows View Post
a spiky noise floor normal for the B-II?
Before my B-II board went kaput, I used to listen to it directly via Ivy III and balanced Senn. HD600s. It was totally silent when music wasn't playing.
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Old 28th July 2012, 09:04 PM   #1782
LeonvB is offline LeonvB  Netherlands
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I think it's the combination of nCores with Legato. I know the IVY3 is silent with those.
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Old 28th July 2012, 09:29 PM   #1783
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Originally Posted by Russ White View Post
A sound like that sounds like it could EMI or some form of HF oscilation (after the IV). That certainly should not actually be coming from the DAC unless for some reason it is enbedded in the digital signal itself, which is possible. It also could be that your amp is very sensitive to HF, and you may need more aggressive low pass filtering. Some class D amps are very prone to this.
Thanks Russ. I am going to do some more testing. The noise definitely goes away when the DAC mutes, so is not related to the IV stage. I will try process of elimination with the DAC, computer server source, and USB interface to try and determine the source of the noise, and then will try address the cause.
I will try headphones connected directly to the Legato to monitor it as well to determine if it might be due to an interaction with the amp.
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Old 29th July 2012, 09:33 AM   #1784
NICKEL is offline NICKEL  New Zealand
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Default Fault Finding

Hello - help needed please

A friend of mine put together a Buffalo II with SPDIF connection to my SB Touch. Its been working perfectly for months till yesterday.

Both channels stutter or lose volume sometimes, but then resumes normal volume. I noticed that a "power off and on" and everything was fine. I lifted the lid off the case and saw that the D1 LED is not constantly bright - it fluctuates in intensity, almost going out. A power off and a power on, and it burns brightly again.

D2 burns fine, and the lock LED is lit, but not the mute. Both Placids are illuminated.

Can someone advise the likely cause, remedy.

Cheers
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Old 29th July 2012, 10:21 AM   #1785
avr300 is offline avr300  Denmark
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Heat issue ?
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Old 29th July 2012, 10:41 AM   #1786
NICKEL is offline NICKEL  New Zealand
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No I don't think heats an issue.
The sound stuttered at the very beginning of a listening session, so the DAC was cold. However, it did lose sound almost completely after a couple of hours, but the power off and on meant it was fine again.

Thanks
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Old 29th July 2012, 10:48 AM   #1787
avr300 is offline avr300  Denmark
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(carefully) measure the 2 outputs of the AVCC module (both sides).
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Old 30th July 2012, 05:24 AM   #1788
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Dry solder joint(s)?
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Old 30th July 2012, 07:45 AM   #1789
NICKEL is offline NICKEL  New Zealand
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Default Fault Finding

Thanks for the suggestions.


It might a few days till I can get it checked. If anybody thinks of anything else please sing out.

Cheers
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Old 3rd August 2012, 09:13 AM   #1790
NICKEL is offline NICKEL  New Zealand
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Well the votages were all over the place. So a check of one of the connector blocks to the Placid revealed it was loose. It looks good now, so will run for awhile.

Thanks everyone
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