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Old 12th March 2013, 07:13 AM   #6541
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Join Date: Apr 2010
Quote:
Originally Posted by klamia71 View Post
i experience a problme with my ncore
when i,m turning it on..the led are turning on nad then turned off and it doesn work at alla
has anyone experienc e something like that?
No - I had one that clicked on and off but RMA process sorted that quickly
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Old 12th March 2013, 07:42 AM   #6542
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Quote:
Originally Posted by AP2 View Post
then you would not have said that the transient response audio does not have a relationship with the psu
I'm sure you'll be able to find the post where I wrote that and link to it here.

worst case, I would think that it comes down to a combination of factors. I rarely see huge capacitance used in in well-received A/B amps. I believe that you are using the "change the goal posts" fallacy which Bruno once mentioned.

I am not attacking you, I am asking for facts and you provide relentless hand waving. I will keep doing it ad infinitum, until you start giving more that "haha", "everyone knows this" or "is not simple to explain".

moreover, coming to this thread in order to "embarrass" me... I'll let others decide what's that called. please, do it in the other thread, people here want do discuss about Hypex Ncore.
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Old 12th March 2013, 10:10 AM   #6543
Julf is offline Julf  Europe
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Quote:
Originally Posted by AP2 View Post
DS450M Class D mono amp has a power reserve of 1368 joules of energy, way beyond the power reserve in the Merrill Veritas or the new upcoming M1 amps from Hypex coming out in June. [U]The DS450M has over 176,000 microfards of capacitor storage.
And the Hypex SMS600/nC400-specified output of 550 W for 90s corresponds to 49500 joules of energy. If we only talk about "reserve" (capacity above continuous power), it is 210 or 300 W (depending on mains voltage) for 90 s, or 18900 / 27000 joule - 14 or 20 times that of the DS450M. How's that for meaningless numbers?

Quote:
The large block transformer, choke regulator, and the Class D switching device in each DS450M amp are in house custom designs exclusive only to Audio Research.
Is that a linear power supply? The "large block transformer" would imply it is.

Quote:
why have used this big capacitors bank?
Because they are needed on a linear supply?

Remember that Bruno states very clearly that the SMPS600/nC400 combination has an effective power supply storage capacitance of 4700 μF, and recommends against adding any more.
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Old 12th March 2013, 10:13 AM   #6544
Julf is offline Julf  Europe
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Quote:
Originally Posted by Juhleren View Post
Not necessarily -apparently Hypex SMPS600 deploys chokes on the HV rails too...
A choke for a 100/120 Hz linear supply is a very different (and much more restrictive) beast than one for hundreds of kHz...
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Old 12th March 2013, 10:35 AM   #6545
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Quote:
Originally Posted by Julf View Post
The first thing to check for is a shorted output (maybe just a stray strand of your speaker wire?). If you are really sure there is no short on the output, I suggest contacting hypex, as there have been some nc400's with the overvoltage protection set to slightly too sensitive. It can be recalibrated, but it is a slightly complicated procedure requiring a stable and precise 3V source.
I,ve checked. Just to be sure i have completely disconnect the speaker wires an d still have the same problem. If there WAs a shorted output, ncores don't have a protection for that?
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Old 12th March 2013, 11:19 AM   #6546
Julf is offline Julf  Europe
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Quote:
Originally Posted by klamia71 View Post
I,ve checked. Just to be sure i have completely disconnect the speaker wires an d still have the same problem. If there WAs a shorted output, ncores don't have a protection for that?
They do have protection - the behaviour you are describing could be the protection kicking in. But I suggest you contact hypex.
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Old 12th March 2013, 01:44 PM   #6547
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i,ve swiched nc400 and smps. still the nr1 nc400 has the same problem. the nr1 smps works fine with nr2 nc400
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Old 12th March 2013, 03:47 PM   #6548
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Quote:
Originally Posted by Julf View Post
A choke for a 100/120 Hz linear supply is a very different (and much more restrictive) beast than one for hundreds of kHz...
Yes -especially if we talk choke input supplies. I'd guess that chokes after the first supply caps should be more comparable as I understand them be more about main noise filtration and damping of various HF artifacts from PS itself. Yes I know that the higher switching freqs of the SMPS should still require smaller chokes, but the switching artifacts might not be only the target.

Regarding the SMPS600 I understood Bruno to hint at the damping effect as the intention which would let me to believe that its definitely not a choke input arrangement. (Please correct me speculation)

The AR class D probably also features a cap input supply and use choke(s) to separate the capacitor bank into smaller and more controllable storage banks... This should also make the chokes magnitudes smaller and thus less intrusive. See for instance the Avondale CLCLC supply -not that I would recommend it for class D.

Anyway from the pics I've seen, I cant see any chunky chokes.
-More speculation I know. Anyway, cap input and chokes for damping would be my approach if I had to use chokes :-)

cheers,
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Old 12th March 2013, 06:16 PM   #6549
Julf is offline Julf  Europe
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Quote:
Originally Posted by klamia71 View Post
i,ve swiched nc400 and smps. still the nr1 nc400 has the same problem. the nr1 smps works fine with nr2 nc400
Get in touch with hypex.
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Old 13th March 2013, 10:44 AM   #6550
3lviz is offline 3lviz  Finland
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I think it is sometimes a good idea to put an RC-filter in front of the NC400 with certain kinds source devices. I have been testing R=510 C=10n (cut off at 31khz or so) filter now a while with M-DAC, which supposedly outputs very high frequency garbage with its Optimal Transient filters.

To me the sound is indeed a tad smoother and stable with the filter. I implemented the filter as XLR-F--filter-->XLR-M, so its removable like attenuator pads. I think at least its worth a try in some cases. Well, there ain't many mods for NC400 anyways .

http://www.pinkfishmedia.net/forum/s...&postcount=165

Last edited by 3lviz; 13th March 2013 at 10:50 AM.
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