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Old 1st July 2012, 06:44 PM   #4671
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Quote:
Originally Posted by Bruno Putzeys View Post
@juhleren if I follow your reasoning you're proposing that placing a large inductance across the speaker somehow affects the signal in a good way? Before discounting the resistor hypothesis it's worth an experiment to add a small resistance in series with the amp and hear what it does.
- Affecting the signal, yes that is what I suggest (Or rather the conditions under which the signal is transmitted / the way the O/P stage couples to the speaker).

- In a good way, that depends on what one is trying to achieve.

Ideally, we all probably agree that the more direct the O/P can drive the speakers coils, the better.

I haven´t tried adding a resistor to a ncore, but I have on UCD´s and several other amps. It is based on those experiences that I believe the "resistor hypothesis" doesn´t quite get the whole picture as to mimic what an O/P trafo does.

Interestingly, I found that ICEPOWER and UCD that both have very low O/P impedance suffered most from adding a 0,22R. They sounded very wimpy and lost much detail and "color" in tone.

BTW, regarding the smps600: does it have chokes on only aux supplies/driver supply only, and/or on the O/P stage supplies?

cheers,

Last edited by Juhleren; 1st July 2012 at 07:00 PM.
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Old 1st July 2012, 08:27 PM   #4672
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Quote:
Originally Posted by Julf View Post
DC magnetic currents? And in what way will a static magnetic field influence *anything* apart from a compass needle? (OK, it might pre-bias some transformers, but is that really a factor to consider?)
No, that is why I think stainless steel, aluminium, copper and so on works just as well as iron, steel etc.

Quote:
Originally Posted by Julf View Post
A ferrite on a speaker cable is a really bad idea.
Why do you think so?

Quote:
Originally Posted by Julf View Post
Have you measured the EMI from a nCore?
No
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Old 2nd July 2012, 12:15 AM   #4673
a.wayne is offline a.wayne  United States
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Hello,
Nc400 and Smps , where are you guys buying and how much ....?
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Old 2nd July 2012, 12:46 AM   #4674
gnomon is offline gnomon  Canada
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Quote:
Originally Posted by a.wayne View Post
Hello,
Nc400 and Smps , where are you guys buying and how much ....?
a.wayne, we are all buying the NC400 (€325) and the SMPS600 (€180) from the only current source, the Hypex web shop.
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Old 2nd July 2012, 12:57 AM   #4675
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Thanks for the responses concerning the chassis.

a.wayne - Check out NC400 for spec on the NC400. To purchase click the "Web Shop" link in the menu.
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Old 2nd July 2012, 12:58 AM   #4676
jtwrace is offline jtwrace  United States
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Quote:
Originally Posted by a.wayne View Post
Hello,
Nc400 and Smps , where are you guys buying and how much ....?
https://www.hypexshop.com/
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Old 2nd July 2012, 01:40 AM   #4677
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Big sale now for those in the US, with the exchange rate at $1.26 = 1 Euro.

Way better than the 1.4 something I bought at.

Alan
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Old 2nd July 2012, 04:24 AM   #4678
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If you search "aluminum magnet" on YouTube, a number of videos appear showing how aluminum interacts with a magnetic field. Here are a few:

Awesome Magnet Tricks - Eddy Currents - YouTube

Magnet Brakes its own fall - YouTube

I can see from these videos why some manufacturers use wood or plastic for their chassis materials.
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Old 2nd July 2012, 04:30 AM   #4679
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And copper's evidently worse!

Magnetic Levitation over copper - YouTube

Edit: Lenz's Law, evidently.

http://www.wimp.com/copperpipe/

Last edited by serengetiplains; 2nd July 2012 at 04:35 AM.
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Old 2nd July 2012, 06:49 AM   #4680
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@Juhleren, the chokes are in the high voltage lines. The low voltage lines use ordinary SMD beads. With regards to inductors in parallel, the only way that can make a load look more resistive is when you're driving only one frequency and the load is capacitive at that frequency. There is no generic "impedance improvement circuit" that you can slap across any speaker in the hope of making the whole thing less reactive. I think some SPICEing around may improve your intuitive feel for this problem.

@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.

(That is not to say that the NC400 needs that treatment though)
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