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Old 21st January 2012, 11:43 AM   #1751
back is offline back  Greece
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ncore have no dc block caps.
ucd does.
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Old 21st January 2012, 12:54 PM   #1752
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Originally Posted by back View Post
ncore have no dc block caps.
ucd does.
So you think I should put a capacitor on the input?
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Old 21st January 2012, 01:43 PM   #1753
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Dear friends,

From the comments on the smps supply opposed to a classic linear one, it does sound like there is a consensus that the "new" technology has surpassed the old one also on sound quality. Please correct me here, as I am trying to get a hold on the possibilities that comes with smpsīs over linear PS designs...

I have a few Qīs regarding how to read the specs and chose a proper smps for various applications that I hope someone would be helpful to answer:

As I get it the smps tech generally regulates in a different way to that of the linear PSīs as the recharging circles are not restricted to the main frequency but designed to be fx 100kHz. This should mean that smps should be "stiffer" than linear supplies, no?

This should also mean that the distortion artifacts produced by the charging is moved up in frequency according to reduced charging circles, no? Hence probably also related to subjectively different audible signature, no?

Generally, what counts in smps design to achieve the very best audible performance of the active circuitry hooked on it?

How big audible differences should one expect from one smps design to another? Has anyone tried various smps designs on the same circuitry to assess this?

Does power rating still count, or does it just need to be adequate. In the linear days a 1000VA donut would blow a way a 200 VA one although only a few watts was actually used... Does this translate into the smpsīs too, hence more authority can be gained by getting a more "stiff" supply by fx choosing a 1200watt over a 400 watt one?

Also when making linear PSīs there is little doubt regarding getting greater performance from dedicated rails per channel opposed to share one big pair of +/- VDC. Does this also count for smpsīs, and if so which of the hypex offerings does offer plural dedicated pairīs VDC rails? Or do one need to purchase a dedicated smps for each channel to get the very best performance?

I would be greatful for any comments.

cheers,
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Old 21st January 2012, 01:49 PM   #1754
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Quote:
ncore have no dc block caps.
Running B&W 802 Diamonds from a DAC with no output caps... that *scares* me. :/
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Old 21st January 2012, 08:52 PM   #1755
HFGuy is offline HFGuy  Canada
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Your speakers will have a series cap for the tweeter anyways.
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Old 21st January 2012, 10:54 PM   #1756
back is offline back  Greece
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Quote:
Originally Posted by sherlockth View Post
So you think I should put a capacitor on the input?
with a tube preamp i think yes.

make sure you add two if your preamp is balanced.
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Old 21st January 2012, 11:03 PM   #1757
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Quote:
Originally Posted by back View Post
with a tube preamp i think yes.
When the preamp has an output cap why put another one at the input of the power amp?
Capacitors are evil so avoid them when possible.
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Old 22nd January 2012, 09:04 AM   #1758
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How close can the SMPS and NC400 be placed? It there a minimum recommended distance? I'm thinking of making a very compact design with the PSU right next to the NC400 module, with the NC400 placed on the long side of the SMPS. See drawing below.
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File Type: png NC400_SMPS600.png (54.0 KB, 550 views)
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Old 22nd January 2012, 09:19 AM   #1759
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Quote:
Originally Posted by StigErik View Post
How close can the SMPS and NC400 be placed? It there a minimum recommended distance? I'm thinking of making a very compact design with the PSU right next to the NC400 module, with the NC400 placed on the long side of the SMPS. See drawing below.
As close as you can get them...
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Old 22nd January 2012, 09:24 AM   #1760
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Ok.
I was only thinking that the way I oriented the modules on my drawing, the input stage of the NC400 would be very close to the input filter chokes of the SMPS... could potentially be a problem.... but then maybe not.
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