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Old 15th November 2012, 12:46 PM   #5421
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Originally Posted by StigErik View Post
And what would that be? I think you will have a hard time finding any purely technical "matching" problems with any of the two amps, since they are both having extremely low output impedance and the same frequency response.
Current delivery capability.. lower THD..
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Old 15th November 2012, 12:48 PM   #5422
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When comparing UcD400 and NC400, THD & IM is far from the same.
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Old 15th November 2012, 12:58 PM   #5423
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When comparing UcD400 and NC400, THD & IM is far from the same.
Indeed, as far as I understand, the nCore is using an improved feedback loop that specifically reduces THD and IM.
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Old 15th November 2012, 01:00 PM   #5424
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Indeed, as far as I understand, the nCore is using an improved feedback loop that specifically reduces THD and IM.
Yes, it's in the whitepaper but from memory Ncore uses a 5th order loop UcD a 3th order, also 20dB more loop gain in the nCore.
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Old 15th November 2012, 01:22 PM   #5425
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Originally Posted by Mark.Clappers View Post
Yes, it's in the whitepaper but from memory Ncore uses a 5th order loop UcD a 3th order, also 20dB more loop gain in the nCore.
Right, I was going to check on that but seems the hypex web site is not feeling very well right now :-/

Anyway, it is just possible that the reason the nCore sounds better than the UcD is that Bruno's theory actually works...
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Old 15th November 2012, 01:27 PM   #5426
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Originally Posted by Julf View Post
Right, I was going to check on that but seems the hypex web site is not feeling very well right now :-/

Anyway, it is just possible that the reason the nCore sounds better than the UcD is that Bruno's theory actually works...
Good guess

The reason the site is down (look at the posts from 13-11-2012): Hypex DSP module(s)
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Old 15th November 2012, 04:28 PM   #5427
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Yes, it's in the whitepaper but from memory Ncore uses a 5th order loop UcD a 3th order.
What do-you mean ?
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Old 15th November 2012, 05:37 PM   #5428
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Originally Posted by Esperado View Post
What do-you mean ?
if you're inclined, this is written by Bruno: http://www.linearaudio.nl/Documents/Volume_1_BP.pdf

maybe some people are probably assuming that everyone posting here knows all the background. NCORE, just as UCD employs high amounts of negative feedback to reduce distortion.
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Old 15th November 2012, 05:53 PM   #5429
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Originally Posted by mr_push_pull View Post
if you're inclined, this is written by Bruno: http://www.linearaudio.nl/Documents/Volume_1_BP.pdf

maybe some people are probably assuming that everyone posting here knows all the background. NCORE, just as UCD employs high amounts of negative feedback to reduce distortion.
You're right, but 1 of the things that sets it apart from the majority of the competition is that is does that over the whole audio range only dropping of @ 50KHz. Disclaimer: this is all from memory as the Hypex web site is still down.

edit: typo again..
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Old 15th November 2012, 06:36 PM   #5430
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if you're inclined, this is written by Bruno: http://www.linearaudio.nl/Documents/Volume_1_BP.pdf
If i understand well, Bruno takes its feedback source AFTER the output switching frequency filter, witch is good to cancel the introduced non linearities of it but add at least 2 poles at the traditional 3 ones. That implies feedback high frequency phases have to be tuned in order to avoid oscillation when you want huge open loop gain and feedback. Such a 5 pole calculation is affraying and require high mastery.
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