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Old 2nd July 2012, 08:08 AM   #4681
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Snickers-is said:

(Originally Posted by Julf
A ferrite on a speaker cable is a really bad idea.)

"Why do you think so?"


A COMMON-MODE ferrite on each speaker cable pair is a very good idea on class-D amps!
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Old 2nd July 2012, 10:29 AM   #4682
Julf is offline Julf  Europe
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@Julf, Ferrite beads on speaker lines are only a bad idea when you put one on each wire, because these things are hugely non-linear in the presence of current. If you put one on a neatly twisted pair it doesn't hurt because the audio currents in both wires cancel. [/QUOTE]

Thanks for the clarification, Bruno - I was thinking of the first case.
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Old 2nd July 2012, 11:13 AM   #4683
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The antenna effect is no big problem in differential mode, especially not if the cables are twisted.
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Old 2nd July 2012, 11:34 AM   #4684
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Having done a lot of radiated emissions testing from Class-D amplifiers (to EN55022), I can safely say that common-mode RF noise on the loudspeaker output lines is always an issue, and sometimes a significant problem.
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Old 2nd July 2012, 06:01 PM   #4685
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Originally Posted by waltzingbear View Post
Way better than the 1.4 something I bought at.
+1

Still well worth it, though. Of course,I've been considering buying more not because I need them, but to improve my overall average cost
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Old 2nd July 2012, 08:11 PM   #4686
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What is the total cost of Ncore if ordered today...? any ideas?...i guess euro is at 1.26
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Old 2nd July 2012, 08:33 PM   #4687
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Originally Posted by thisisvv View Post
What is the total cost of Ncore if ordered today...? any ideas?...i guess euro is at 1.26
Currency Converter - Google Finance
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Old 2nd July 2012, 08:55 PM   #4688
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Originally Posted by jtwrace View Post
that i know..asking what is the net price in euro/$ if someone has ordered it ..shipped it and made other diy things needed to make it work..

sorry if it was a stupid questions...
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Old 2nd July 2012, 08:57 PM   #4689
jtwrace is offline jtwrace  United States
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Originally Posted by thisisvv View Post
that i know..asking what is the net price in euro/$ if someone has ordered it ..shipped it and made other diy things needed to make it work..

sorry if it was a stupid questions...
Maybe these will help you:

Chassis & Parts Sources

Show Us Your Core-NCore!
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Old 3rd July 2012, 08:34 AM   #4690
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Quote:
Originally Posted by Mintzar View Post
No. Phase is correct.
We'll try again. I just noticed you said gain is low. It sounds like only the hot input wire is connected.
Quote:
Originally Posted by Ouroboros View Post
Having done a lot of radiated emissions testing from Class-D amplifiers (to EN55022), I can safely say that common-mode RF noise on the loudspeaker output lines is always an issue, and sometimes a significant problem.
In general terms, CM on cabling is the way most emissions leave the amp. But by all means do the same measurement on the NC400, just to see where the various class D amplifiers stand relative to eachother.
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Last edited by Bruno Putzeys; 3rd July 2012 at 08:37 AM.
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