I will add to what my colleague just posted. Our measurement should look pretty good, as we have done on earlier PCB. One of the challenge in measuring switching amplifier (see
http://www.audioprecision.com/index.php?page=resources&id=1000000162) is how to seperate the very low level modulating frequency from noise and distortion. This is especially hard when an amplifier such as NuForce has 100Khz of bandwidth. User after user have found that this amplifier provide a wide sound stage among other benefits. We believe it is the effect of the wide bandwidth that allows hunman ear to distinguish the position of the sound. You can try this experiment if you have an AP equipment. As you move up the cut off frequency, the THD+n goes up proportionally. What it tells you is that the measuring equipment is being confused by the modulating frequency and think that it is noise. Publishing only 1Khz plot is a joke. But that's the best number everyone is able to get. We will show THD vs Freq plot and also THD vs power plot AT DIFFERENT FREQ.
You will also find almost all vendors use AES17 filter set at 22khz cut off. The effect of doing that is to practically drop the THD+N of anything > 10Khz. Meaurement result can be manipulated and presented in the best light.
For all those skeptics out there, I would say read up on the tech notes at Audio Precision website (so that you can tell if the vendor is hiding something), interpret the plots yourself, don't believe in marketing BS that claims 0.0x% THD at 1Khz. Or 0.0x% at 300W. Come on, as the power goes up, noise becomes less of a component of the output voltage.
You will hear what Jerry has to say. He is the first guy who recieved the amp in audition. We just posted a review from a user on the website. He is not a dealer. Listen for yourself. What we wrote on our website (home page, FAQ etc) are not marketing BS. Well, it certainly sound like it when you first read it. How can all that be true.
Well, we let our customers speak for us. It is time to throw away the misconception that a top performing amp has to cost a lot of money. Some people will say, hey, the amp is so small and light, there's nothing here. But wait a minute, look closely. What do you see in a linear amp that weighed 100 lbs ? Most of the space are filled up by big transformer. NuForce amp has more components than any linear amp. And it is not digital. If you compare all the reviews, you will find something unusual. They're all pretty much saying the same thing. We're still pretty shocked by what people have been telling us. If we have to write the reviews ourselves, we don't even dare to write it that way, even if we're a little drunk
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Ok, lets see what Jerry has to say. Who knows, he might be the first one to say we suck. By the way, if you can read Italian, Dutch or Swedish, go read what those customers have to say on the internet. We have an Italian customer who started posting all over in Italy 2 days after receiving the amp.
Jason
