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Old 20th December 2012, 03:08 AM   #5741
6sigma is offline 6sigma  United States
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I thought the Class D/nCore/UcD amps were cool like T-amps. What happened to all that efficiency and the Ncore contrast to the monster Class A amps? I'm asking...not being snarky. Dreaming of making the Hypex products a part of a new career...so I'm really curious.
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Old 20th December 2012, 06:18 AM   #5742
akasha is offline akasha  Denmark
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Quote:
Originally Posted by Mark Verhoeven View Post
Anyone who did comparison between SMPS power supply and decent linear power supply at the NC400 lately?
some month ago we compared on my 108 db/w horns, and agreed the difference was minor and a little leaner overall character of SMPS, the horns presenting a eeeeasy load, and we never used more than 1 watt from the nCore for obvious reasons ;0)

2 weeks ago we did a comparison on some 91 db/w difficult and down to 2 Ohms impedance, this made the SMPS take the lead in every aspect and really made the nCore shine, faster, cleaner more control of the speakers and more dynamic, a match made in heaven, or by Bruno.
P:S: the "normal" PS is absolute top class
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Old 20th December 2012, 07:11 AM   #5743
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally Posted by yetis View Post
I have a three channel Ncore amp and I just leave the unit on all the time. However, the heat buildup is too great, almost too hot to touch. I want to setup the SMPS to go into standby. I know I use pin 1 on J1 connector of the SMPS and need build/buy a trigger circuit that applies a constant voltage, to keep it in standby mode? I also understand that once the SMPS is in standby, it will send the amp portion into standby, within 15 min? My question is, how do I go about setting up this circuit. Any help would be great. I have never build something like this.
my ncore (only 2 channel) never got anywhere near warm, lukewarm at most.

I know ds23man has made a hypex standby print which will supply the 9V to the SMPS standby pins, and has a relay to switch the ampon at the same time. he set it up that it will work with both pushbutton or a switch
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Old 20th December 2012, 07:19 AM   #5744
Julf is offline Julf  Europe
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Quote:
Originally Posted by 6sigma View Post
I thought the Class D/nCore/UcD amps were cool like T-amps. What happened to all that efficiency and the Ncore contrast to the monster Class A amps? I'm asking...not being snarky. Dreaming of making the Hypex products a part of a new career...so I'm really curious.
Well, a class A amp that could output 400 W per channel would heat up your house pretty nicely. But even with 93% efficiency (a remarkable number compared to a linear amp) you will still be dissipating 30 W per amp at full power. Add the power supply losses to that, and you realize 3 or more amps in one box will still produce a bit of heat.

The idle power of one amp is specified at 5W, and the same goes for the SMPS, so if you have even 2 nc400's and 2 SMPS's in one enclosure, you will have to dissipate 20 W at idle.

Compare that to what a 2 x 400 W analog amp would burn...

Don't take this the wrong way, but this is all based on basic stuff from the hypex data sheets. If you want to build a career on the Hypex products, I would suggest partnering up with somebody with a solid technical background.
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Old 20th December 2012, 07:23 AM   #5745
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Class-D amps are very efficient at full power, but their idle consumption can be suprisingly high. The switching signal is still running at 50% duty cycle at idle, and in a high power amp, the switching losses in the MOSFETs and the filter inductors are still there. If the output bridge been set for a low dead-time (to improve distortion), the losses may be higher still.
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Old 20th December 2012, 07:25 AM   #5746
Julf is offline Julf  Europe
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Originally Posted by robbbby View Post
I have not noticed any negative effects with regards to the sound with having a small transformer in parallel with the supply power.
Considering all the stuff that is connected in parallel with your power mains (dishwashers, microwave ovens, power drills, light dimmers, computer SMPS's and you name it), I would be somewhat surprised if adding a small transformer would make any difference
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Old 20th December 2012, 07:26 AM   #5747
Julf is offline Julf  Europe
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Originally Posted by Ouroboros View Post
If the output bridge been set for a low dead-time (to improve distortion), the losses may be higher still.
5W for each nc400, 5W for each SMPS600.
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Old 20th December 2012, 07:30 AM   #5748
Julf is offline Julf  Europe
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Originally Posted by yetis View Post
I get that you have a device that reduces a 120VAC current to a 9VDC. This connects to the IEC and then to pin one on J1, via the power button. I am just not sure what I am looking for on Digikey, despite a couple hours of searching. Any help would be great.
The small DC supply robbbby linked to should do it, possibly coupled to a small relay if your power switch isn't AC level.
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Old 20th December 2012, 01:41 PM   #5749
yetis is offline yetis  United States
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Thank you everyone!
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Old 20th December 2012, 09:16 PM   #5750
robbbby is offline robbbby  Canada
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Quote:
Originally Posted by Henkjan View Post
my ncore (only 2 channel) never got anywhere near warm, lukewarm at most.

I know ds23man has made a hypex standby print which will supply the 9V to the SMPS standby pins, and has a relay to switch the ampon at the same time. he set it up that it will work with both pushbutton or a switch

Is there a post where he shows how he did it? i'm a bit curious. Where did he get the 9V from?
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