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Need help with Hypex NC400 build
Need help with Hypex NC400 build
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Old 31st July 2014, 04:57 PM   #1
jayzon87 is offline jayzon87
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Join Date: Jul 2014
Default Need help with Hypex NC400 build

I started a new build a coupe of days ago.

It's a dual mono configuration with 2x nc400 and 2x SMPS600 in one alu-case.

I've just completed building the case, and i am about to install the connectors.
The NC400 modules are shipping at this moment.

I have some questions about earth/ground in the installation.

I am going to use XLRs for inputs, but i just have RCA in my pre-amp.
There is a mic-cable RCA- XLR that should work. Hypex recommend to always use XLR for better sound quality.

In the manual is says to add a cap if you are going to earth the mains, as i going to do.

The question is: Are you supposed to ad this in this installation with mains grounded?
http://www.hypex.nl/docs/NC400_datasheet.pdf
Page 13, figure 3.

I'm also wondering: the NC400s will have grounded mains, the pre-amps does not have grounded mains. But the computer of course have grounded mains. Will i get a ground-loop and bad sound? I also use a USB-DAC between.

Thankful for some help.

Regards
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Old 14th October 2014, 11:39 PM   #2
microbiologycory is offline microbiologycory
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Join Date: Oct 2014
Default hum

Cannot speak to the first questions, but if one of your amplifiers is grounded and pre-amps or sources aren't you could definitely have some hum. Could use a cheater plug that has the ground removed, or simply connect them all to the same high quality RFI/EFI filtering power strip (which will probably be grounded). I'm interested in your earlier questions as I'm planning an NC400 or Anaview build soon myself.
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Old 15th October 2014, 10:42 AM   #3
Julf is offline Julf  Europe
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Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by jayzon87 View Post
I started a new build a coupe of days ago.
You might want to read through the Hypex nCore thread in the commercial section.

Quote:
I am going to use XLRs for inputs, but i just have RCA in my pre-amp.
There is a mic-cable RCA- XLR that should work. Hypex recommend to always use XLR for better sound quality.
Just to be precise, Hypex recommends balanced connections. XLR just happens to be the most common connector for balanced connections.

Quote:
In the manual is says to add a cap if you are going to earth the mains, as i going to do.

The question is: Are you supposed to ad this in this installation with mains grounded?
Yes - if your mains isn't grounded, you don't need the cap (and resistor!). But grounding mains to the chassis is a good idea.

Quote:
I'm also wondering: the NC400s will have grounded mains, the pre-amps does not have grounded mains. But the computer of course have grounded mains. Will i get a ground-loop and bad sound?
Maybe. The nc400 has a proper differential balanced input, so it won't be affected by ground loops, but your unbalanced preamp will now be connected to mains ground through two paths - through the RCA connector to the nc400's, and through the computer-DAC-preamp chain. Thus the nc400's aren't a factor here - ground loops depend on your DAC and pre, not the hypex stuff.
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Old 15th October 2014, 10:43 AM   #4
Julf is offline Julf  Europe
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Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by microbiologycory View Post
Could use a cheater plug that has the ground removed
On the power connection? That could prove lethal...

Quote:
or simply connect them all to the same high quality RFI/EFI filtering power strip (which will probably be grounded).
How will RFI filtering help with ground loops/hum?
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