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Class D Switching Power Amplifiers and Power D/A conversion

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Old 19th July 2012, 11:48 AM   #4831
Studley is offline Studley  United Kingdom
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Default warm up

Does warm up affect the sound - in other words are there benefits to leaving the smps in standby? What are owners' experiences?

Second question: there is reference way back in this thread to a case GB. I've tried searching the GB forum but can't find anything. can somebody point me to it if its still live.
 
Old 19th July 2012, 11:55 AM   #4832
jtwrace is offline jtwrace  United States
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Quote:
Originally Posted by Studley View Post
Does warm up affect the sound - in other words are there benefits to leaving the smps in standby? What are owners' experiences?

Second question: there is reference way back in this thread to a case GB. I've tried searching the GB forum but can't find anything. can somebody point me to it if its still live.
I don't find any difference with warmup but I usually put the system on before I"m going to listen anyway. I'm still a believer that it's your ears that need to warmup.

Try listening and then walking out of the room for 5 min or so and come back. You will most likely find that it's too loud.

This case? CNC mono chassis $71.50ea + shipping Utah

http://www.audiocircle.com/index.php?topic=106336.0
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Old 19th July 2012, 12:11 PM   #4833
Julf is offline Julf  Europe
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Originally Posted by jtwrace View Post
I'm still a believer that it's your ears that need to warmup
I agree - "warmup" is usually a perceptual effect. With the nCores, I would assume most of the possible temperature-related changes in component values (if any) would be compensated for by the feedback loop.
 
Old 19th July 2012, 02:11 PM   #4834
sonnenwender is offline sonnenwender
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Default B1

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Originally Posted by Mark Verhoeven View Post
I am not Bruno, but I do own a (non DIY, but originally build by First Watt) B1 which is modified quite a bit. (better caps and better pot, different resistors) Even before owning a NCore amp, it was clear to me that the B1 isn't the last thing for resolution (to say the least...). So I woulnd't recommend you to use it, it isn't balanced either. I like connecting my DAC (12 Ohms output impedance balanced output) directly to the NCore with TKD pot a lot better. But why not try it yourself? (assuming you own a B1 yourself)
No, I don't own a B1. I just thought when I'll have finished building the ncore amp I might opt for something more difficult to build. The ncore will me my first DIY project in the electronic domain...but thanks for your comments on the B1 . I would definitely want something with high resolution powers.
 
Old 20th July 2012, 08:18 AM   #4835
StigErik is offline StigErik  Norway
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Quote:
Originally Posted by Studley View Post
Does warm up affect the sound - in other words are there benefits to leaving the smps in standby? What are owners' experiences?
The only advantage of leaving the SMPS (and NC400) on is that it might have a longer life. There is no sonic advantage at all.

I always turn my system off when its not being used, it saves me a little on the electricity bill ....
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Old 20th July 2012, 09:54 AM   #4836
sonnenwender is offline sonnenwender
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Default Up and running

After some difficulties to understand which cable needs to connect to which pin of the XRL input the first mono amp is up and running. Connected it to an old loudspeaker just to make sure that I didn't make any mistake in order not to blow up my main rig. But sounds just fine. After the holidays when the amp cases hopefully will have arrived I will report on my sound impressions.
 
Old 20th July 2012, 12:13 PM   #4837
Studley is offline Studley  United Kingdom
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Originally Posted by Julf View Post
I agree - "warmup" is usually a perceptual effect. .
Hi Julf - you've clearly never owned a Class A amp then! Certainly with Pass and First Watt amps there is a very big difference between initial turn on and 1 hour later - but that is fully to be expected because its about reaching optimal operating temperatures for the FETS. Its pleasing to hear that the ncores don't require the same.
 
Old 20th July 2012, 12:20 PM   #4838
jtwrace is offline jtwrace  United States
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Originally Posted by Studley View Post
Hi Julf - you've clearly never owned a Class A amp then! Certainly with Pass and First Watt amps there is a very big difference between initial turn on and 1 hour later - but that is fully to be expected because its about reaching optimal operating temperatures for the FETS. Its pleasing to hear that the ncores don't require the same.
I did this test on my Class A amps before I purchased NCores.

How long does it take for your amp to heat up?
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Old 20th July 2012, 01:13 PM   #4839
barrows is offline barrows
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Default My...

Experience with the nCores has been different... I found that they, at the very least, needed a few days of break in to come on song. I found them to sound good at first, but that the low level detail retrieval and high frequency extension was just not there initially. In fact I was quite dissappointed in the sound at first (the reports from others had my expectations quite high). Considering the number of electrolytic caps in the SMPS 600 and nCore itself, I do not find this surprising.
I have not had enough experience with them yet to know if the same factors will aplly to warm up, but I suspect that they will. Good news is that keeping the nCores "on" is really not a big deal, especially compared to my Pass which uses 250 watts at idle...

I have read a couple of "shootout" type comparisons with other amps vs nCore where some have said the nCore sounded a little veiled in the high frequencies... I suspect that this observation may be related to the nCore being compared in a cold state to amps that were powered up continuously (or, maybe, the traditional amps had quite a bit of rising distortion with frequency ...)
 
Old 20th July 2012, 01:39 PM   #4840
jtwrace is offline jtwrace  United States
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We were speaking about warmup not break-in.
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