UcD modules' limits on delivered current. - Page 2 - diyAudio
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Old 26th September 2006, 03:09 PM   #11
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Hey Yves, you said unmodified, though I trust you've removed the AC coupling electrolytics? Same here, also 400AD's, they're outstanding just with the AC couplers gone.
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Old 26th September 2006, 03:27 PM   #12
beppe61 is offline beppe61  Italy
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Quote:
Originally posted by classd4sure
Hey Yves, you said unmodified, though I trust you've removed the AC coupling electrolytics?
Same here, also 400AD's, they're outstanding just with the AC couplers gone.
May I ask you which speakers are you driving with them?
Which amps have you already compared with your UcDs?
I heard of people selling their high-end amps in favour of DIY creations based on UcD modules.
Thanks a lot.
Regards,

beppe
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Old 26th September 2006, 05:06 PM   #13
fokker is offline fokker  China
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Quote:
Originally posted by classd4sure
fokker you should read the AES paper on the Hypex website on UCD and you'll know the answer to that question.

Cheers

questions are sometimes asked other than to get answers.
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Old 26th September 2006, 05:17 PM   #14
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Quote:
Originally posted by fokker



questions are sometimes asked other than to get answers.

Yeah if you're trolling, you're right though, it really wasn't worthy of an answer, that's why what I gave you was more along the lines of rtf.
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Old 26th September 2006, 06:59 PM   #15
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Quote:
Hey Yves, you said unmodified, though I trust you've removed the AC coupling electrolytics? Same here, also 400AD's, they're outstanding just with the AC couplers gone
Nope, I'm really running them unmodified! I have thought a lot about shorting the AC couplers, but I'm unsure about my Denon 4306 (acting as pre) having good quality DC free outputs...

If my amp is on and I turn on the Denon later, there's a very very quiet click...
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Old 26th September 2006, 07:02 PM   #16
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@Beppe,

Yes, I was in the market for a high-end amp to match the N804's, as they weren't sounding like I heard them in the shops... Of course I knew that before, those puppies are quite hard to drive and I would need good clean power.

Then I found out about UCD here, and though, hey why not give it a try.

And really, it's money well spent. I've never looked back. There could be better stuff out there, but I don't think there is at the price I paid!

Regardless of sound, "power"-wise they are extremely good. Lots & lots of power, high amperage available when needed.

And soundwise well... just buy a few UCD400AD's and be turned to class-d!
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Old 26th September 2006, 07:13 PM   #17
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Quote:
Originally posted by Yves Smolders


Nope, I'm really running them unmodified! I have thought a lot about shorting the AC couplers, but I'm unsure about my Denon 4306 (acting as pre) having good quality DC free outputs...

If my amp is on and I turn on the Denon later, there's a very very quiet click...
That little click is probably the settling of the receiver's output coupling cap and you don't need two in series. see if you can measure a milivolt or less at the output of the receiver, it'll probably be zero.

Try one module DC coupled and measure it's DC output level, if it doesn't look too bad , say less than volt or so, try it with a cheap speaker, you should see it drop to within spec of 50mV, probably less.

With the newer 400's you can just let the amp warm up for a little while and then use the DC trip pot on the daughter card to fine tune it to zero.

If you should need to keep it AC coupled upgrade with a film cap at least.
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Old 26th September 2006, 07:46 PM   #18
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Beppe, I'm Italian and I live in Torino (well, close enough... Chieri). I've built a 6-channel power amp based on unmodified UCD 400.
It sounds awesome with any kind of load: I own both ribbon speakers (Apogees) and horn speakers (Avantgarde) and the sound is always fantastic.

If you want to send me your coordinates via email we can arrange for meeting and having some listening sessions...

In Italian:
Mandami per mail le tue coordinate, così ci possiamo sentire e/o incontrare!

Here's a picture of my amp with only 2 channel power supply installed...
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Old 26th September 2006, 07:48 PM   #19
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...and here is the power supply for the remaining 4 channels.
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Old 26th September 2006, 08:11 PM   #20
beppe61 is offline beppe61  Italy
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Quote:
Originally posted by Yves Smolders
@Beppe,
Yes, I was in the market for a high-end amp to match the N804's, as they weren't sounding like I heard them in the shops...
... And soundwise well... just buy a few UCD400AD's and be turned to class-d!

Actually a very solid recommendation.
Thank you very much Mr. Yves.
Kind regards,

beppe
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