UcD400 listening vs. Halcro & Gamut - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th November 2006, 03:05 PM   #1
diyAudio Member
 
Alfetta87's Avatar
 
Join Date: May 2003
Location: Alsace
Cool UcD400 listening vs. Halcro & Gamut

A few weeks and today we made an extensive comparison listening test of a slightly modded UcD400 dual mono amp: 22F coupling caps cap bridged, Axon 5.6F + Auricap 1.0F in //, four times directly from the input XLR to the modules, 500VA tranny per channel, Cerafine caps with 40,000F total, Hexfred diodes in rectifier.

The amp was compared within an existing setup:
dCS Verdi Edgar CD/SACD drive, converter Elgar Plus directly into a pair of Halcro's DM88, with Synergistic cables (active biased).
Speakers were Focal Grande Utopia, and the Top model of Electra Be (1000) series, both models use similar versions of the Berrylium tweeter.

Other setup (few weeks ago) was a fully Gamut set: L7 speakers, M200 monoblocks, D3i preamp, CD3 CD player, all wired in Wireworld.

To make it short: the Ucd came damned close to the Gamut amps, with similar tonal balance, (very slightly) less room and depth, but same musicality. For amps which cost more than 10 times my kit...

The Halcros are incredible good amps, and beat the UcD. But not by miles! First they have a different tonal balance: less bass weight, and upper band more present. They are more transparent, without any doubt (maybe I should change my coupling caps to something better?). High frequencies seem to have no limits.
One listener though preferred the more controlled, yet more forward LF band of the UcD (Grand Utopia have tendance to play on one sibgle note below 100Hz), and he said he heard the Focals for the first time that well controlled in the bass.
Image was in both cases excellent, the Halcro added a few yards to the backstage, but placement of instruments in the room was equal.

Conclusion was that for a fraction of the Halcro price (less the a hundreds), you can get so much quality is a real sensation. Bravo to Bruno and Jan-Peter.

If I would find the f@&*%g camera, I would make a picture of the setup (Halcro-dCS-Focal), and post it here leter.

Cheers,
- dan
__________________
It is worth to keep your mouth shut and let people think youre stupid; rather than to open it and thus eliminate any doubts...
  Reply With Quote
Old 25th November 2006, 10:30 PM   #2
diyAudio Member
 
DEQ+TheEnd's Avatar
 
Join Date: Nov 2005
Default Input buffer?

Thanks for the review Dan!

My guess this is the version with the AD8620 input buffer that is revived here? Do you think feeding the buffer with separate 12V power lines or maybe replacing the buffer with the new LM4562 could help the UcD compare even better up against those expensive amps?

regards
Hans
  Reply With Quote
Old 26th November 2006, 07:04 AM   #3
diyAudio Member
 
Alfetta87's Avatar
 
Join Date: May 2003
Location: Alsace
Default Input buffer

Yes, the modules are equipped with AD8620, but they are not fed with a separate PS. Will think about it! I don't know the LM4562, did you test it?
I'm quite happy with the AD, using it also at I/V converter and output amp in my CD player. Will try to get some and test them.

- dan
__________________
It is worth to keep your mouth shut and let people think youre stupid; rather than to open it and thus eliminate any doubts...
  Reply With Quote
Old 26th November 2006, 07:10 PM   #4
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
Get rid of the coupling caps in the signal path and you'll probably find them to be even better. DC coupling is the way to go if you can do it.
__________________
Brian
  Reply With Quote
Old 26th November 2006, 07:17 PM   #5
diyAudio Member
 
DEQ+TheEnd's Avatar
 
Join Date: Nov 2005
Quote:
Originally posted by BWRX
DC coupling is the way to go if you can do it.
Talking about that. Have anyone testet if the DC-protection on the Hypex HG or ST supply has any sonic impact ?
  Reply With Quote
Old 27th November 2006, 01:15 PM   #6
diyAudio Member
 
Join Date: Sep 2003
Location: -
Quote:
Originally posted by DEQ+TheEnd


Talking about that. Have anyone testet if the DC-protection on the Hypex HG or ST supply has any sonic impact ?
No...the DC-protection of the HG/ST supply has NO sonic affect!

Jan-Peter
  Reply With Quote
Old 27th November 2006, 05:45 PM   #7
diyAudio Member
 
maxlorenz's Avatar
 
Join Date: Oct 2003
Location: osorno , Chile
Thanks Dan for the nice review...and for the good news

I subscribe what has being said about DC coupling.
I will soon put those LM4562 (into UCD180 first). It is a very transparent opamp. Everyone that has tried it say so.
I use it on a DVDP with excellent result.
Hypex could use them in standard UCD to avoid us the trouble

I don't know what PS caps are stock on the latest version. I replaced them for Rubycon ZL 470uF/100V and I'm very pleased with the improvement: faster, more dynamic and transparent sound. More precise.
I swapped at the same time the output filter cap for Wima MKS2 polyester, wich may account for softer and extended highs. I understand that new modules feature new Panasonic film caps.

I hope this helps,
M
  Reply With Quote
Old 28th November 2006, 06:54 AM   #8
diyAudio Member
 
Alfetta87's Avatar
 
Join Date: May 2003
Location: Alsace
Quote:
Originally posted by BWRX
Get rid of the coupling caps in the signal path and you'll probably find them to be even better.

Am afraid that some DC coupling might harm my UcD. Knowing that my personal preamp has already a CD coupling, I can bypass the one in the (input) signal path, but will leave them for "outdoor" applications (i.e. when I use it elsewhere where I don't know if the preamp is AC or DC coupled.

- dan
__________________
It is worth to keep your mouth shut and let people think youre stupid; rather than to open it and thus eliminate any doubts...
  Reply With Quote
Old 28th November 2006, 02:58 PM   #9
diyAudio Member
 
Join Date: Feb 2005
Location: Antwerp
I've read about the LM4562 also...

Is this something that can be dropped in as replacement on the UCD400AD, or do I need to change anything else?

Thanks
  Reply With Quote
Old 28th November 2006, 03:35 PM   #10
diyAudio Member
 
Alfetta87's Avatar
 
Join Date: May 2003
Location: Alsace
Quote:
Originally posted by Yves Smolders

Is this something that can be dropped in as replacement on the UCD400AD, or do I need to change anything else?

Thanks
According to National's data sheet, it could be a direct replacement w/o any mods or adds.
Ordered some LMs thru my company and will try, let you guys know when done.


Cheers,
- dan
__________________
It is worth to keep your mouth shut and let people think youre stupid; rather than to open it and thus eliminate any doubts...
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
halcro amplifier rickpt Solid State 81 23rd January 2014 02:14 PM
Halcro - The Worlds Only Super Fidelity Amplification Products SkinnyBoy Everything Else 22 6th December 2012 09:35 AM
anyone know anything about the new class d from Halcro called Lyrus? kuribo Class D 19 29th January 2005 12:35 AM
gamut amp brian t Solid State 1 10th August 2002 11:37 AM


New To Site? Need Help?

All times are GMT. The time now is 03:17 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2