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Old 23rd December 2011, 11:42 PM   #1011
ChrisPa is offline ChrisPa  United Kingdom
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Bruno

a question about separation of smps and nc400

The physical design of the nc400 allows for some pretty funky case design, whereas the smps is a big (comparatively) rectangular lump

What are the limitations if any on going for a modular approach and mounting them in separate enclosures with an umbilical between them. Any problems of any kind with noise if the PSU interconnection goes between 2 cases?

Thanks
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Old 25th December 2011, 08:18 PM   #1012
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@dallas: The Ncores Steve heard are the NC1200 demo's that are in Alan Silverman's possession. Alan's been demoing the amps around and so far Steve is the only person who didn't like them. I can only surmise that the Bel Canto's are pleasantly coloured. This is quite likely because Bel Canto's owner has a good pair of ears and, knowing the limitations of the actual amplifier hardware he has probably hammered the things into such a shape that whatever they couldn't do in terms of neutrality at least they did in terms of pleasantness. The Bel Canto vs Ncore comparison has been done elsewhere too and even someone who I'd expect to have been significantly biased towards the BC's called the Ncores the finest amps he'd ever spent time with. I think it's a fact of life that people have tastes.

@chris: I think the umbilical should work fine. Do keep the cable in a tight bunch.
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Old 25th December 2011, 11:01 PM   #1013
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Bruno, maybe you should post some square wave plots once and for all, as you can see some people can't seem to sleep well thinking what might be lurking there
and maybe explain to them why the 60kHz ringing should not be a problem.
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Old 26th December 2011, 11:32 AM   #1014
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The frequency response plot is given in the data sheet. It shows a ripple around 60kHz (corresponding to a local minimum in the loop gain, see the white paper) and for no reason other than ordinary time-frequency duality this means that the impulse response (and its integral, the step response) must have a corresponding wrinkle as well.
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Originally Posted by mr_push_pull View Post
and maybe explain to them why the 60kHz ringing should not be a problem.
Isn't this getting the wrong end of the stick? Perhaps any armchair amplifier theorists might first come up with a hypothesis why the ripple in the frequency response should be a problem. Then we can see what to do about this particular hypothesis. Otherwise it's like asking a physicist why apples don't fall up, or up and slightly sideways, or sideways, or generally down but somewhat sideways. It's a great way of keeping him busy.
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Old 26th December 2011, 11:44 AM   #1015
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Well done!
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Old 26th December 2011, 11:46 AM   #1016
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Bruno, works pretty well for me.
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Old 26th December 2011, 12:38 PM   #1017
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Old 26th December 2011, 03:52 PM   #1018
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Default dc offset?

For those of us who run fully active, what is the normal dc offset range at the output terminals?
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Old 26th December 2011, 05:43 PM   #1019
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I measured my two modules now. The "worst" of them has 25 mV offset, and the other one 18 mV.

25 mV is approx 0,08 mW into 8 ohms.......
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Old 26th December 2011, 06:26 PM   #1020
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Yup that's about it (50mV abs max). Now you mention it, that's not in the data sheet. To be fixed once everyone's back.
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