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Old 11th February 2013, 06:37 AM   #6311
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Quote:
Originally Posted by Julf View Post
Did you do the comparison as a double-blind ABX, or as a sighted subjective evaluation?
We just listened to the same song with subjectively the same volume.

I am not claiming its the truth, just what we experienced

The bridged one also sounded a bit warmer.
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Old 11th February 2013, 06:38 AM   #6312
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Quote:
Originally Posted by ds23man View Post
I am missing the cap across the output terminals!
Why? It is there! A little small red wima cap.
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Old 11th February 2013, 07:08 AM   #6313
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Quote:
Originally Posted by Julf View Post
Did you do the comparison as a double-blind ABX, or as a sighted subjective evaluation?
...or level matched within 0.1 dB?
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Old 11th February 2013, 07:20 AM   #6314
Omholt is offline Omholt  Norway
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About level matching. Is there a finish product on the market where this is can be easily done as well as connecting two units and switching with a button?
Or PM if someone would like to build something like this for me.
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Old 11th February 2013, 07:24 AM   #6315
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Its easy if you can individually adjust the level going to the amps: simply connect a speaker between the + terminals of both amps, play music and adjust the level of the amps until you have no sound from the speaker.
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Old 11th February 2013, 08:32 AM   #6316
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I have had them running all night today playing low volume. The cases are very hot. I can hold my hand on them without pain, but it is hotter than anything I have had before.
I will check if Hifi2000 sells more ventilated top covers to this case (Galaxy Maggiorato with aluminium top/bottom)
The internal regulators are working in the nc400 because I do not have the smps600. So they are dissipating more heat than the in normal case.
Without the top cover it was not running hot at all.
Any other advice what I can/should do? I know theat many class-A amplifiers are running very hot, maybe it is ok?
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Old 11th February 2013, 08:40 AM   #6317
Julf is offline Julf  Europe
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Quote:
Originally Posted by Rajapruk View Post
Any other advice what I can/should do? I know theat many class-A amplifiers are running very hot, maybe it is ok?
The hotter you run electronics, the sooner they fail, so ventilation holes would be a good idea.
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Old 11th February 2013, 08:54 AM   #6318
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Rajapruk,

Interesting observations on the bridging.

Regarding the heat, then how about making a small VDR supply. You shouldn´t need more than a small 12 to 15 VAC coil, a bridge and a small cap say 2200uF. Then use the negative HV supply as reference and you should have the 17-21 VDC you need for the VDR. It should save you half the heat dissipation form the modules and maybe that could also bring other improvements too

Best,
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Old 11th February 2013, 09:39 AM   #6319
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally Posted by Rajapruk View Post
I have had them running all night today playing low volume. The cases are very hot. .
strange.. I had my ncore at a DIY gathering last WE, and even at elevated music levels the cabinets were lukewarm at most. (standard aluminium Hifi 2000 slimline cabinets, ncores just mounted on the bottom)
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Old 11th February 2013, 09:55 AM   #6320
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Quote:
Originally Posted by Henkjan View Post
strange.. I had my ncore at a DIY gathering last WE, and even at elevated music levels the cabinets were lukewarm at most. (standard aluminium Hifi 2000 slimline cabinets, ncores just mounted on the bottom)
Henkjan,

I think the point here is that the external VDR is not used which roughly doubles the standby heat dissipation of the ncore modules. Playing music loud or not makes close to no difference as you have very good efficiency (probably > 90%) when neglecting the standby consumption hereunder the internal VDR (5W per module).

I don´t think the bridge configuration should make any noticeable difference on the heat dissipation form class D amps although it usually do on other classes of operation...
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