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Old 28th July 2012, 10:49 PM   #4881
Studley is offline Studley  United Kingdom
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Quote:
Originally Posted by OllBoll View Post
Maybe you have accidently shorted the outputs, then the amp should click if I remember correctly.
Not that because it works fine when I connect it direct to my source
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Old 29th July 2012, 05:00 PM   #4882
DavidT is offline DavidT  United States
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Hello Studley,

Sounds like a frustrating issue. Input transformers can resonate 10 dB (or so) at around 40 kHz to 80 kHz. This may cause instability issues or perhaps input overload with a leaky DAC. At the least, resonance can give you a couple dB's of lift at 20 kHz. That lift might sound irritating...

You can properly damp the resonance with an RC Zobel using component values recommended by the manufacturer.

For reference, see pages 370 and 371 of DS's "Small Signal Audio Design" for his discussion of circuits and FR graphs of this issue. He shows a Zobel of 3K3 ohm in series with 4n3 across the output of a Sowter 3276.

Jensen Transformers, accompanied by their recommended compensation circuits, also work well IME.

Apologies, if you have performed this compensation already.

HTH,

David

Last edited by DavidT; 29th July 2012 at 05:13 PM. Reason: spelling
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Old 30th July 2012, 08:04 AM   #4883
Julf is offline Julf  Europe
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Quote:
Originally Posted by Studley View Post
Update: my preamp only has RCA outputs so I am using Sowter transformers to convert the signal to balanced.
Have you tried just using a RCA-to-XLR cable (wired according to the hypex data sheet) without the transformer?
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Old 31st July 2012, 04:11 AM   #4884
redjr is offline redjr  United States
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Is the NC400 module stereo or single channel? I cannot find this info on their product spec page.
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Old 31st July 2012, 04:23 AM   #4885
cab is offline cab
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mono. you need 2 for stereo.....
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Old 31st July 2012, 02:45 PM   #4886
redjr is offline redjr  United States
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Quote:
Originally Posted by cab View Post
mono. you need 2 for stereo.....
Oh great. My project just doubled in cost!
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Old 31st July 2012, 02:47 PM   #4887
tinitus is offline tinitus  Europe
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or listen in mono
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Old 31st July 2012, 04:15 PM   #4888
redjr is offline redjr  United States
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Question: Is the new NCore technology proprietary to Hypex, or is this a new Class D industry designation available to other vendors? I'm particularly interested in how this (NCore) technology compares to the B&O ICEPower Class D amp modules.
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Old 31st July 2012, 04:29 PM   #4889
3lviz is offline 3lviz  Finland
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The nCore technology is proprietary to Hypex (similar to how ICEpower is to B&O), but there are two versions of the modules, one exclusively aimed for DIY community and one aimed for commercial markets and brands (similar to how ICEpower modules are).
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Old 31st July 2012, 04:54 PM   #4890
jtwrace is offline jtwrace  United States
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Quote:
Originally Posted by redjr View Post
Oh great. My project just doubled in cost!
Just get 2x NC400 and one SMPS600 to start then add the second SMPS600 when funds allow.
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