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Old 4th October 2006, 11:36 PM   #1
Anzgar is offline Anzgar  Sweden
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Default Interested in discussing the sound quality of NewClassD (and other class d amps)?

The thread "New module by Lars Clausen" has been closed by the moderator.
I think that is a pity, since it not until now that the modules are being shipped out and we have a fair chanche to take part of more than one persons point of view.Also it might be interesting to have it compared to other class d amps, old as well as new ones.
If there are more people interested in this issue I hope someone will start a thread or hang on to this one.
With all due respect:

Anzgar

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Old 4th October 2006, 11:41 PM   #2
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I'll post the RMAA results here for ya.
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Old 5th October 2006, 12:07 AM   #3
soongsc is offline soongsc  Taiwan
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I've started a thread here for comparison of class Ds and linear amps.

http://www.diyaudio.com/forums/showt...02#post1021702

Seems like a friendly discussion up to now.
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Old 5th October 2006, 12:53 PM   #4
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Hi, all.

Thank you Anzgar for the thought to start a new thread for the listening impressions of the NewClassD modules.

Let's hope that we can all contribute with unbiased opinions to whatever listening experiences will be gained with this new design by Lars.

I have followed the previous post from day one and although great insight was gained (thanks classd4sure), in the end i was left with a bitter taste in my mouth for the words exchanged between fellow diyiers (of shorts..).

Anyway as i am also waiting for the modules to arrive to Greece, when i finish building the true dual mono power amp, i will revert with my findings against linear amplification (Audia Flight Pre / Power 100 class-A designs) and two different sets of loudspeakers: one of the sensitive kind (Furuyama Audio Labs full range assisted by a Great Heil tweeter and Backes&Muller Sub1) and the other of the low sensitivity kind (Dynaudio Confidence 5 - one of the best for my liking anyway).

Let's hope that we will get many replies on this thread with all sorts of comments on sonics only. I will not be posting any measurments or graphs, just plain comments of how they sound.

I might be tempted to test it against the zappulse 2.3Se and XE700 amps i have also built in the past.

Bye for now,

Nikos.
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Old 5th October 2006, 08:20 PM   #5
Anzgar is offline Anzgar  Sweden
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Hi marmasuoris and welcome to the thread!
I see you have got your 700XE modules,congratulations!I have not got mne or got my money back either, I got a copuple of faulty modules which I returned and when LC Audio announced they will not deliver any of them I thought I'd get my money back but so far I only payed for nothing.
I obviously will receive the NewClassD modules tomorrow and I can hardly wait until then,,, I hope I'll won't do any mistake in assembling the amp but spend tomorrow evening listening to the new class D for the first time.
Will you tell a litte about how you experienc the sound of 700XEs?To start with....

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Old 6th October 2006, 01:26 AM   #6
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I am also interested in knowing more about the 700XE and possibly how it compares against the Audia Flight Pre / Power 100 class-A designs.
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Old 6th October 2006, 01:29 AM   #7
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hmmmmm..... while you're at it, maybe you can compare 700XE to mueta too. That'd be super interesting.
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Old 6th October 2006, 01:35 AM   #8
fokker is offline fokker  China
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great idea to have this thread as I was thinking about opening one just like this as well.

Let's focus on the modules themselves and how they sound. there will always be detractors but let them be detractors.
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Old 6th October 2006, 02:19 AM   #9
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Originally posted by classd4sure
hmmmmm..... while you're at it, maybe you can compare 700XE to mueta too. That'd be super interesting.
Those are made of unobtanium:
http://www.unobtainium.com/


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Old 6th October 2006, 09:29 AM   #10
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Anzgar: O.K. then, let's start...

I did not experience any problems so far with these modules and i have implemented two different power amps. The first one was with the stock power supply/transformer as supplied by LC Audio (i.e. Predator extended with 2X15,000mF caps and 550VA single transformer) and the other was a dual mono power supply using two 650VA transformers plus 4X18,000mF Nippon Chemicon Gold Tune caps with 4X35A diodes (normal ones no ultra fast soft recovery ones).
The main difference between the two P/S was a better soundstage, more unconstrained sound better transiets when the stiffer power supply was used. The difference was the same as moving from the zappulse 2.3SE to the 700XE modules. BTW the stiffer power supply can justify the extra expenditure easily and the same applies as well as moving from the 2.3Se modules up to the 700Xe ones. It's a pity though that tey are discontinued but wait...let's be optimistic..let's see how NCD compares....

Soongsc: The Audia power amp is a real beast in the way it was put together: 32 Toshiba IGBTs 2x750 VA trans with a total of 200,000mF Kendeil caps for just 100watts etc. But the end question is how it sounds... Well the 700Xe with the stiffer p/s has better low end, quicker and more robust, the midrange is more clear and the highs more extended but not as holographic as the class A design. Also the microdynamics are better resolved through the class A design but the overall sound is more laid back than with the class-D. If your loudspeakers have high sensitivity and sound up-front and you still want to use the 700XE class-d design then you can combine it with a passive unit (i have used one with a 10k pot) with v.good results.
There was a mismatch when i used the Audia Flight Preamplifier with the 700XE amp and my 95db high sensitivity speakers...there was a high hissing sound that would not go whether i used the single ended or balanced connection. I believe it was the fact that the class-d amp has a higher gain than the matching Audia amp. When the Dynaudios were used the hissing sound diminished a lot but still it was not as dead quite as i have read the UcD amp is (according to classd4sure).

classd4sure: I have not built any other class-d amps except the LC Audio kits (from the first version of zappulse 2.1), but i have heard ready made ones from CI Audio, Tact, Jeff Rowland, Sharp etc. I believe you can tailor the final sound from a diy to your liking and i believe that if you know what you are doing the final result can outperform many ready-made units.

Bye for now,

Nikos
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