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Old 7th June 2013, 01:00 AM   #6901
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All multi-core unshielded cables should be twisted. (power, speaker, signal or control) as it reduces interference pick-up.

Cat5 is a perfect example.
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Old 7th June 2013, 07:24 AM   #6902
Julf is offline Julf  Europe
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Quote:
Originally Posted by Speedskater View Post
All multi-core unshielded cables should be twisted. (power, speaker, signal or control) as it reduces interference pick-up.

Cat5 is a perfect example.
Cat5 is an example of a high-speed, (relatively) long-distance connection that is susceptible to interference. While "all multi-core unshielded cables should be twisted" is a good rule of thumb as a first approximation, it should not be taken as an absolute commandment. Low-impedance, slow-speed control connections (such as nAMPON) are pretty immune from interference, so twisting is not required.
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Old 7th June 2013, 07:36 AM   #6903
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Quote:
Originally Posted by Julf View Post
Cat5 is an example of a high-speed, (relatively) long-distance connection that is susceptible to interference. While "all multi-core unshielded cables should be twisted" is a good rule of thumb as a first approximation, it should not be taken as an absolute commandment. Low-impedance, slow-speed control connections (such as nAMPON) are pretty immune from interference, so twisting is not required.
but nampon is just a single wire, theres nothing to twist it with!
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Old 7th June 2013, 07:42 AM   #6904
Julf is offline Julf  Europe
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Originally Posted by ufokillerz View Post
but nampon is just a single wire, theres nothing to twist it with!
Just like the mythical battery with just one pole

If nampon would need to be twisted, it should be twisted with a ground lead. But it doesn't.
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Old 9th June 2013, 02:18 AM   #6905
miero is offline miero  Czech Republic
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I've found interesting post in the history of this loooonng thread related to "dragons" beyond 20kHz:

Quote:
Originally Posted by Bruno Putzeys View Post
They are nonsense. I know the game. Someone has a case to make (e.g. for the existence of supernatural beings, telepathy, etc) and they try to prove this by pointing at evidence which perchance hasn't been collected yet but which will surely vindicate their beliefs when provided. And when you say "bollocks" they'll then proceed to challenge you to disprove them, thereby suggesting that by default their theory holds. And by accepting to play their game you accept their terms. Well, before doing so, be aware of what follows: you do the hard work to do the experiment of which they claim to know the answer without bothering to try. You provide evidence which flatly refutes their claim. What happens? Instead of saying "you're right and I was wrong" they'll just invent another story for you to disprove. That tactic is called "moving the goalposts". It is one of a range of techniques nitwits use to give the impression that they are in a position to take on actual experts. I haven't the foggiest whose claims you are referring to but I'm imagining some forum discussion where someone says "oh THD is nothing, it's IMD that matters" and someone else says "go and check out the IMD plot then, it's all there" followed by the first speaker replying "yes but their plot stops at 20kHz and beyond that be dragons". It just keeps going, there's no telling what they'll come up with next.

Now, to answer your question technically. Ncore's loop gain is plotted in the white paper. Unlike linear amplifiers, open loop distortion is fully independent of frequency so the distribution of various harmonics is the same for all frequencies. You can take that as a given. You can read the distortion spectrum either from the 30W plot I posted earlier or you can glean a good indication from the IMD plot done at even higher output powers. So you look up how much lower loop gain is at various harmonics of 10kHz, you look up the amplitude of the matching harmonics from a known spectrum and from there you can work out what the HD would be at 10kHz. Since loop gain includes the output filter, be sure to scale the calculated HD back down 40dB/dec after 35kHz.

In short, the information is already there. Querulants often rely on their inability to read in order to make a point
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Old 9th June 2013, 07:48 AM   #6906
Julf is offline Julf  Europe
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Quote:
Originally Posted by miero View Post
I've found interesting post in the history of this loooonng thread related to "dragons" beyond 20kHz:
Ah, thanks for the reminder - I am sure we have all come across people like the ones Bruno talks about...
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Old 9th June 2013, 08:04 AM   #6907
qusp is offline qusp  Australia
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yes, I must bookmark that post, it'll save me some time ... Every few days it seems there is someone that needs reminding of that. hey Julf?
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Old 9th June 2013, 08:08 AM   #6908
Julf is offline Julf  Europe
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Every few days it seems there is someone that needs reminding of that. hey Julf?
I did save it too, I do think it might come in handy
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Old 9th June 2013, 09:20 AM   #6909
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Frans,also try at www.zelfbouwaudio.nl dutch forum
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Old 13th June 2013, 12:48 PM   #6910
fpitas is offline fpitas  United States
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I am constructing an amp with two NCORE 400s, intended to drive 2 ohm loads on each output (4 x 8 ohm drivers in parallel for each channel). This is for my home stereo system, where the average power will be a few watts at most. Is one SMPS600 supply still sufficient, or should I use one per channel for best performance? And, would constructing the amps as monoblocks result in better performance?

Thanks in advance,
Francis

Last edited by fpitas; 13th June 2013 at 12:51 PM.
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