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Old 20th November 2013, 02:00 AM   #11
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The suggestion of the fan is great. I will looking for a fan that silent enough for this application. According to your description a small fan is enough. I think the fan should be mounted on the back front rather than top cover.
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Old 20th November 2013, 02:06 AM   #12
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oh...It seems that there's no room for fan non the back.
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Old 20th November 2013, 04:25 PM   #13
AClarke is offline AClarke  United States
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Default Fan-cooled RE2507-NC enclosure for dual NC400

Quote:
Originally Posted by siliconray View Post
oh...It seems that there's no room for fan on the back.
If you find a fan small enough to fit on the back, the reduced size would have to be compensated with increased fan speed to match the same volume of air flow as my 120 mm fan. Obviously, the 120 mm fan is going to beat a smaller fan since it won't have to turn as fast to accomplish the same amount of work and it will be quieter and last longer. I build desktop computers for a living and decided long ago to abandon any power supply equipped with 80 or 92 mm fans because of their higher failure rate and louder noise. I started using Seasonic power supplies with 120 mm fans and have never looked back. They are quieter and not one fan (or PS) has failed me after ~200 builds. The 120 mm Notcua NF-S12A FLX fan I chose for my dual NC400 stereo build has a mean time between failure (MTBF) of 150,000 hours which translates to 17 years. Since I'm running it at half its 12V DC rating, the fan could potentially last even longer.

I held a piece of tissue paper over the ventilation holes present in your case and the paper rises to about a 45 degree angle because of the air flow exiting the case. I couldn't be more pleased with the lower temperatures. And as I said before, the transformers on the two NC400's (which are the hottest part of the amp) get a direct hit from the fan. This benefit may not be achieved from a rear-mounted fan.
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Old 20th November 2013, 11:02 PM   #14
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Neither machining nor LED fan is a problem for us. But do you think a case with big LED fan on top really looks like a professional hifi device?
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Old 21st November 2013, 04:52 AM   #15
AClarke is offline AClarke  United States
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Quote:
Originally Posted by siliconray View Post
do you think a case with big LED fan on top really looks like a professional hifi device?
I think you should offer it as an option since opinions vary on aesthetics. For me, a beautiful case that causes an amplifier to overheat because it lacks a fan is not a professional hifi device. Several people who saw my amplifier before I replaced the the LED fan with the ugly-looking Noctua fan thought it looked exotic. The black LED fan also matched the case better than the beige Noctua. If the fan grill is also black instead of chrome, the entire thing will be less noticeable. Do a Google image search for "120 mm black fan grill" without quotes.
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Old 21st November 2013, 08:00 AM   #16
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OK. I will redesign the vent holes on the top, then add 4 holes to mount the fan. I'm going to find a silent fan for this case.
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Old 21st November 2013, 01:17 PM   #17
AClarke is offline AClarke  United States
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Default Fan-cooled RE2507-NC enclosure for dual NC400

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Originally Posted by siliconray View Post
OK. I will redesign the vent holes on the top, then add 4 holes to mount the fan. I'm going to find a silent fan for this case.
The existing vent holes seem to be fine and have no need of redesigning. Only the one big hole for the fan & the screw holes need to be added. For what it's worth, my hole diameter is 115 mm and is located 32.3 mm from the back edge of the case.

I'm curious as to why you would modify a case to suit only one person. Has anyone else requested modifications to lower the NC400 amplifier temperatures?
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Old 21st November 2013, 08:47 PM   #18
ro9397 is offline ro9397  United States
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Quote:
Originally Posted by AClarke View Post
My only temperature measurement was with my hand. After running the amp at a medium to near-high sound level for 1 hour, I could not keep my finger on the NC400 transformer for more than 2 seconds. If one were to forgo using a fan, I would deem anything short of mounting a heatsink directly to the NC400 transformers to be insufficient...INSIDE the case!
Prior to building the first six NC400/SMPS600 mono blocs in Siliconray RE2207 chassis I was concerned about component temperature. I read a lot on the subject including Bruno's posts in this forum. (Since that time I built about twenty more mono and one stereo/SMPS1200 in this RE2507.)

Bruno stated quite clearly the hottest running component is the largest capacitor in the PS. I'm sure of this because he went so far as to state that after X years (20 IIRC) the capacitor running continuously at X temperature (somewhere within its rated specification range) might change its value but might/could/would still be within spec. He also posted about recommended spacing above/below the PS, etc.

The poster states his transformer is hot, but states nothing about the largest capacitor in the SMPS1200A400.

IMO, and I feel strongly about this, it's absolutely useless to make any generalization about component temperatures in this application based on the information provided. The following minimum hard specs are required to draw any conclusion for any other application:

Actual temperatures of the hottest components
Actual (not maker's marketing dreams) impedance graph and sensitivity for the loudspeakers
Sound room volume, three dimensions
Actual tested SPL peaks/average with music at the listening seat...test tones are worse than useless because they are misleading
Ambient temperature at the amp site with the amp off
Is the amp enclosed or in free space, and if the former, what is magnitude of air volume?
Speaker wire gauge (yes, this absolutely could make a huge difference because NC400 makes a ton of current and too little copper converts amp current into useless wire heat instead of speaker power...I have direct experience with NC400 re. this item)

A dramatic change to any single item above could turn one's results upside down.

Get Hypex' comments in reference to the above facts and then make conclusions relative to your own application.

Minus that it seems useless or worse (misleading) to conclude anything from this post whether another application may run too hot or not.

My 2c.
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Old 21st November 2013, 11:05 PM   #19
ro9397 is offline ro9397  United States
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Default Stereo exceeds mono performance

Mono NC400 amp with 600W power supply is limited to 600W maximum PS current per ch. Stereo NC400 powered by single 1200W PS has potential advantage: one shared 1200W PS can split between two channels any current up to 1200W maximum. IOW, if one NC400 required >600W, the other channel <600W, any combination up to 1200W total, the stereo amp exceeds mono block performance. Strange but true.

Only two known potential mono advantages: protection circuit in SMPS600 apparently lacking in SMPS1200A400 and potential for lowest speaker cable resistance via closest possible siting to the speakers.

I'm one of few persons with direct AB experience with NC400 powering two high end speaker loads identical except for minimum impedance 2.65 Ohms vs. 10.6 Ohms.

NC400 has extreme current potential. On extreme loads NC400 performance audibly suffers with too high speaker cable resistance. I recommend much more copper than formulas found on the net.
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Old 22nd November 2013, 12:12 AM   #20
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I'm just curious: how big is your listening room or how strong are your ears? Do you really run your amp to 400W???
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