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Old 4th September 2007, 01:22 PM   #21
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Default Re: ELEKTOR September article

Wow, my own result is not too bad, compared to some tested class D modules...chic!
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Old 4th September 2007, 01:38 PM   #22
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Default Re: Re: ELEKTOR September article

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Originally posted by Bender.ru
Wow, my own result is not too bad, compared to some tested class D modules...chic!

Really? Post here as chart please!
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Old 4th September 2007, 01:53 PM   #23
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One moment please:
to be continued...
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Old 4th September 2007, 01:57 PM   #24
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...next one.

source: http://www.elektor.com
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Old 4th September 2007, 02:44 PM   #25
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Thanx. Well, little bit strange point is -1db power, why not -3db as usual? Actually, and Bender can confirm it, i always told -real pro=Bruno IMO NCD1 THD&Noise measurement vs promises looks quite predictedly yet, Classd4sure was right..
http://www.newclassd.com/index.php?page=10
Quote:
THD levels are the lowest in the Audio Industry at most load conditions, and at the most common conditions such as 1W @ 8 Ohm and 10W @ 4 Ohm, the distortion of the NewClassD module is 3 to 15 times lower than the leading other brands of Class D modules. This is a difference you can hear instantly.
Furthermore you get 115 dB of usable dynamic range, very low background noise, and wide bandwidth up to 120 kHz.
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Old 5th September 2007, 07:08 AM   #26
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Lightbulb Re: Re: Re: ELEKTOR September article

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Originally posted by IVX
.. Bender can confirm it, i always told -real pro=Bruno
Exactly! In view of modules perfomance/price rate (UcD120euro vs NCD286euro), hypex put on the market excellent product. Imho other words original UcD is quality standard for D class amp in midpower range, or entire range for home use amps.
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Old 6th September 2007, 05:38 PM   #27
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Quote:
Originally posted by IVX
Thanx. Well, little bit strange point is -1db power, why not -3db as usual? Actually, and Bender can confirm it, i always told -real pro=Bruno IMO NCD1 THD&Noise measurement vs promises looks quite predictedly yet, Classd4sure was right..
http://www.newclassd.com/index.php?page=10

Hello Ivan

We double checked the modules when they returned from the test in Elektor, because the level of THD would be rejected in our quality control. So it looked strange that a module with this high THD (0.03%) would have gotten through.

Our control check showed that the 0.03% was correct on one of the modules, at 10 kHz, while at the rest of the audio band the THD was 0.005%. After a further examination, it turned out that the trimmers on the module had been tampered with, even if they are locked with laquer, and it takes quite a bit of violence to loosen them. The other module showed 0.002% THD throughout the audio band, and the trimmers were locked.

As we examined the test in Elektor more carefully, they measured the output power to ~100W with a 40V supply, even though it is stated in our datasheet that the nominal voltage is 60 - 63V DC. This might give the less observant reader the impression that our module is only delivering ~100W while our competition put out ~200W. When in fact the only difference on that point is the power supply voltage being wrong by the test team.

We don't know if these 'faults' are deliberate or just sloppyness on behalf of the journalist, however we find it of less importance how our product is rated in Elektor, while it is much more interesting how our customers rate the sound and quality of our modules. So we have no reasons to worry.

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Old 10th September 2007, 09:54 AM   #28
Puffin is offline Puffin  United Kingdom
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Can't get hold of Elektor in Guildford WHS ?

Withdrawn because of missing free gift ?
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Old 16th September 2007, 04:38 PM   #29
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Lars,

I find it a bit strange that you post here that they tampered around with your modules before testing them. Did you ask ELEKTOR before what happened? It may seem easy to blame others when the test did not work out as expected.
How do you justify the relativly high price of your modules?

Klaus
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Old 16th September 2007, 07:03 PM   #30
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Klaus: Thank You for posting these questions.
You are right, maybe it does look a bit strange. I wanted to point out some discrepancies in the test, as a comment to the conclusions made by IVX earlier in this thread.
One flaw of the test is very obvious if you look at the data presented in Elektor. Our amplifier is only putting out around 100 W in the Elektor test, which is only half of what we promise in our datasheet. Some people who read the test might notice this underperformance, and think we oversell our product.
However if you study the test specs in Elektor carefully you will see they have tested our module at 40V and not the recommended 60-63V from our datasheet, building instruction etc. That is the obvious reason the module is only putting out half the promised power. Why did they do that?

I hope for your understanding that i will not wish to make any futher comment on this issue, partly because i have said my points, and also because i don't think that Elektor as a media really target our customers. Personally when i used to buy Elektor, it was because i wanted to see schematics, and new components. Not so much finished audio modules. But admittedly thats some years in the past now.

Why our amplifier is highly priced compared to many other Class D modules? Well our module cost just almost the same in components, as we can estimate other modules cost. So it's not so much about the material cost.
However on top of that we put about one technician hour into each module for THD adjustment, to cancel dead-time distortion. This has to be done at working temperature, and a THD curve is drawn for every module from 20 to 20.000 Hz. The module does not pass until the THD at all frequencies is below 0.004%. They are typically 0.002% though. (1W 8 Ohms). About 1 of every 5 modules don't pass at all, because they have too high capacitances in the Gates of the MOSFET, and so they can not fully meet the test limit.

Why don't we launch a low cost 'light' version on the market without this heavy adjustment? Well we did exactly that 8 months ago to see if there was a market for low cost options at half the price of the NCD1. But after 2 months we had received all but no interest from the market for this low cost module. However in the same period, we sold hundreds of full price - full adjusted modules. So we took it as a sign, that people are actually interested to pay a little more to get the best module.

I think a good explanation to this is that the 'mid price' market is already crowded with dozens of other brands, and the other main reason is, that even though the NCD modules might cost double what other modules cost, when the whole amplifier is finished with enclosure, transformer, plugs etc. the price difference is only maybe 20%. And i think most people are more than willing to pay 20% more for the amplifier if the sound is notably better.
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