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Old 21st December 2011, 05:59 PM   #951
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And what about your speakers' design and specs?
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Old 21st December 2011, 06:09 PM   #952
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and signal source...
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Old 21st December 2011, 06:23 PM   #953
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The Ncore is maybe a bit "faster" at the end of transients?

Its almost like the UcD adds som kind of "reverb" or longer decay of transients. In technical terms it doesn't of course, I'm talking purely of subjective impression here. It's like a layer of "something" thats there all the same, which the Ncore is free from.
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Old 21st December 2011, 06:24 PM   #954
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Ah... speakers are B&G RD-75 ribbons. Signal comes directly from a DAD AX24 DA-converter. No preamp.
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Old 21st December 2011, 08:29 PM   #955
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let in burn in for a a few days and come back with more details
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Old 21st December 2011, 10:39 PM   #956
back is offline back  Greece
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Originally Posted by StigErik View Post
Ah... speakers are B&G RD-75 ribbons. Signal comes directly from a DAD AX24 DA-converter. No preamp.
i wonder compared to a ucd400hg+hxr if the difference would be smaller

because now you have double+ power.
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Old 22nd December 2011, 06:29 AM   #957
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Hello Erik,
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Originally Posted by StigErik View Post
The gold output terminals may look fancy, but they dont hold the wire good enough I think. The wires have come loose several times here. Guess it won't be a problem when the module and wiring is mounted in a case though.... so its a minor issue.
Could you use a spring beneath the screw, a (tooth) lock washer at best or even better, on each side of the cable shoe? No flat washer at all. This should fix the screw and the issue. (The precision mechanics "trick", the contrary is to be seen all over the industry.)

Quote:
LEDs. Why, why, why are there SOOOOOO many of them. Looks like Amsterdam's red light district over here now..... I waiting for dubious women to appear behind my speakers any time soon.
This is an issue I could live with, if the dubious are pretty and kind enough...

Bruno, thank you for the great work! The paper data are nearly unbelievable.
I found some simple measurements regarding the noise of LEDs and Zeners anywhere. Following this, some Zeners are comparable to the LED's behaviour at least.
When did you decide for litz wire? I did in 2006.
Click the image to open in full size.

Cheers, Timo
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Old 22nd December 2011, 07:26 AM   #958
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Thanks for the great comments! I know what the modules sound like but it's always nice to hear someone else say the same

Concerning the screw tag I think it's the springiness of stranded wire that gives the impression that the screw is tightened fast enough before it really is. It certainly fooled me the first time. When you use solid wire, silvered wire (which has thicker strands that stay tighter together) or fork lugs ("cable shoes" in germano-dutch-english), you get a much better "feel" for when it's tightened well. I've set the purchasing department on the search for fork lugs that we can include in the package.

Regarding the input cable: did you actually push the locking lever when trying to remove the cable? In the pulling contest between locking lever and crimp connection, the lever always wins...

Red LED district: Being (reluctantly) Belgian I'm not so much used to seeing red light districts as garishly lit private houses sprinkled along the main roads between cities. They come in any conceivable colour so long as it's fully saturated.

@tiki: I've also seen the noise test, it's somewhere on Diyaudio. I couldn't reproduce it so the one zener voltage that came out as really quiet appears to be an an exceedingly brand dependent outlier. Admittedly LEDs are brand dependent as well but on the average they outperform zeners. Not wanting to settle for average I've tested loads of them and finally settled on a particular colour from Agilent which has both lowest 1/f noise and white noise of the pack, and which no standard zener diode can even approximate.

I didn't switch to litze per se. It simply becomes necessary on account of fringing losses when the ripple current is high (i.e. inductance is low) and the air gap is wide. Otherwise foil is fine and rather cheaper. The reason why you see more and more litze in our modules is because I've decided to reduce inductance.
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Last edited by Bruno Putzeys; 22nd December 2011 at 07:28 AM.
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Old 22nd December 2011, 07:41 AM   #959
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Great that you want to supply fork lugs! That will fix this minor problem I think. For the record, I used stranded speaker cable.

I did push the locking lever, but pulled the cable to hard I guess. My fault entirely.
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Old 22nd December 2011, 07:43 AM   #960
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Quote:
Originally Posted by back View Post
i wonder compared to a ucd400hg+hxr if the difference would be smaller

because now you have double+ power.
If so, it's not because of more power. I rarely exceed 1W peak output from my amps.
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