UCD180 questions

Jump to Latest
#203
Hi Jan,

It's at

http://www.audioprecision.com/index.php?page=support&id=1000000292

The program is called GraphBuilder. Haven't tried it myself yet, but do tell me how it went.

It works with a system one but: you need to use the APWin software, which in turn requires that the PC interface board is the newer version. I gather you've got your S1 for quite some time now, so you might not have the board needed to run the windows software.

Bruno

PS: I love the quote on your signature. It would be wonderful if more people knew and understood it, but I'm afraid the Strong Anthropic Principle is beyond most...
 
#206
Too late, Rane included the hamster already in their DJ mixer TTM54i. See http://www.rane.com/ttm54i.html
Click to expand...

Steven, I was particularly interested in the switching Hamster technology. I believe that this mixer was based around a different topology.🙂

Bruno, Thanks for the Audio P link on the Graph Builder. Most useful. I will most definately use this to characterise any amplifiers I get to evaluate. I've been wanting to try this for some time. It gives a far more complete picture about the THD+Noise issue.
Also, as a quick aside, your own CD player design has been mentioned, a one bit D2A. I'd be interested to hear your thoughts on output modulator design and more importantly, the effect of noise shaping order and oversampling rate on the sound quality. It's of particular interest to me at the moment.

F.

PS I feel moderately naked without a suitable quote at the end of my posts. JohnW, a light hearted observation, "Fools you are..." Otto von Bismarck I believe? I think that Freund himself would have trouble figuring that one out, A man from an engulfed culture, who shares his name with an ultimately brilliant but doomed piece of german precision engineering that will live in infamy forever more 😉
 
#207
"Fools you are..."

Wish I could remember - read it once....

But I like Steven's the best,

"The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973"

How very true - maybe even more so today.

BTW, the R&S has the waterfall 3D graph display option, but not colour graded, so very hard to tell whats going on...

I find the "Waterfall" option very usefull when sweeping Freq, level & THD - always shows up any "Issues" with digital modulators...

John
 
#208
Bruno,

You wrote "A good class D designer can always design a class AB amplifier of better performance".
Logically, assuming that Class A designs usually sound better than AB, and that a good (excellent) Class A tube amp leaves any SS-amp in the dust, shouldn't audiophiles better forget Class D and go back to those power-hungry valve amps to get the best sound 😀 ???
Or can we state a better AB amp hasn't been designed yet ?

More seriously, I'm willing to try those UCD-modules, but do they provide as much air around the instruments and reveal those nice tonalities ('timbre') as good tube designs do? 😕

Yves
 
#209
Question to Jan-Peter:

1 I think it can be an advantage to sell OEM modules whitch clearly states that you have AD8610. This can make your modules even more high-end and attractive.

I don't know though if it's good or bad to mention that your "regular" modules have NE5534 (even though I donä't think that NE5534 isn't so horrible, you can't get more hifi for the money)


2 Can't you let someone build an amp and let it be tested in the danish/swedish hifif magazine High-Fidelty? A similar thing was made by ICE and they offered modules to a promotional price.
 
#210
Tangui said:
You wrote "A good class D designer can always design a class AB amplifier of better performance".
Logically, assuming that Class A designs usually sound better than AB, and that a good (excellent) Class A tube amp leaves any SS-amp in the dust, shouldn't audiophiles better forget Class D and go back to those power-hungry valve amps to get the best sound 😀 ???
Or can we state a better AB amp hasn't been designed yet ?
Click to expand...
I was only talking measured performance, not necessarily "sound". One reason why the "good class D" designers have not yet been seen embarking on the "better class A(B) project" is because sonically the class D's (nearly) invariably have a substantial edge over linear amps of similar measured performance.

Tangui said:
More seriously, I'm willing to try those UCD-modules, but do they provide as much air around the instruments and reveal those nice tonalities ('timbre') as good tube designs do? 😕
Click to expand...
IMHO they do.
 
#212
Peranders,

It's indeed an idee to use the AD8620. For OEM manufactures we can always make a special version, however this is only possible in bigger orderquantities.

It also a very good idee for a review by the Danis/Swedish Hifi magazines. I don't have any contact in that area.

Perhaps we better have a private email contact about this.

Regards,

Jan-Peter

www.hypex.nl
 
#213
A PWM amp I developed about 15 years ago sounded very nice, transparent and by no means harsh, despite having around 0.5% THD.
The two main advantages class-d amps have over most linear amps:

1.) No crossover distortion (this is a little exagerated but soemtimes you have to 😉 )

2.) Capability of driving complex loads with ease (they don't have to be specifically designed for this they "just do it").

Regards

Charles
 
#214
Jan-Peter said:
It also a very good idee for a review by the Danis/Swedish Hifi magazines. I don't have any contact in that area.
Click to expand...

They are nice blokes so just get in contact with them 🙂

The magazine has also the right attitude for your products. They are towards high-end equipment.

http://hifi.dk

I'll guess you can get in contact with Thomas Madsen which has written for them.
 
#218
matjans said:
and while you;re at it (jan peter), you might want to read this thread on biasing opamps in to class a.

I;ve sent you an email, btw. Next week i;ll be working near groningen (haren) so i was wondering whether it;d be possible to pick 2 ucd180;s up at your factory (which saves me shipping costs).
Click to expand...

Should be nothing stopping you from making that mod yourself, not everyone seems to like it, and it would run hotter/less reliably. Could be something to try though.
 
You must log in or register to reply here.
Top Bottom