i'm really curious about that included heatsink
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O-Noorus D3 PRO - A new TPA3255 PFFB amplifier with DAC
- Thread starter Audionaut
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Roy_D
Active Member
The ok button cycles through to there but that's also needed to reach input selection...
Roy_D
Active Member
Just it on top shaves 2C off temp. With thermal pad probably 5.
hmm ok but why is it there to begin with? i mean, it's extremely unaesthetic to put it on top of the amp
Roy_D
Active Member
Yep. Could it have to do with one of those modes where it basically is going full tilt?
Roy_D
Active Member
Roy_D
Active Member
@Alexander Lin feel free to chime in with some technical info!
Sorry for my ad hoc posts so far - Stepping barefooted on Lego bricks all the time put me on edge
Sorry for my ad hoc posts so far - Stepping barefooted on Lego bricks all the time put me on edge
Roy_D
Active Member
that might be it - I will try gently tomorrow lol..
Roy_D
Active Member
Thermal pad on heatsink on amp at 20 volume temp heatsink 35 take it off temp case 40 so actual benefit I'd say not much unless a constant breeze was at play then the added surface area might bleed off more heat from the case.
On the bottom of the case there are 3 rows of 2 long vent slits but they are mostly closed as it appears a heatsink attached to the class D chips on the underside of the board is attached to a metal plate which is screwed tight into the bottom of the case which then closes off all but one slither of one of the 6 slits on the bottom.
Basically the whole case is heatsink.
I think a heatsink on the bottom night have been more practical but less effective. Heatsinks without steady drafts or fan are just buffers.
On the bottom of the case there are 3 rows of 2 long vent slits but they are mostly closed as it appears a heatsink attached to the class D chips on the underside of the board is attached to a metal plate which is screwed tight into the bottom of the case which then closes off all but one slither of one of the 6 slits on the bottom.
Basically the whole case is heatsink.
I think a heatsink on the bottom night have been more practical but less effective. Heatsinks without steady drafts or fan are just buffers.
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The manual has not been produced yet, but SF Express (Shunfeng Express) logistics is much faster than we expected. We wanted to send you the electronic document manual before you received the goods, and it will be sent by email today.
This is the internal heat sink, and it does not block the slot under the shell.
The precision of the electronic volume is 0.5db. When the left and right channel balance is set to 0, the gain is 29db, and the channel balance changes by 5db from (-5) to (+5). For example, if the volume is set to 50, the left channel balance is set to (-5), and the right channel is set to (+5), the actual left channel is 45 and the right channel is 55. However, the volume display is still 50.
Roy_D
Active Member
Thank you I will keep an eye on my mailbox.
On closer inspection moving the amp back and forth for being able to gauge depth better and with a bright light I do see there is some clearance between the internal heatsink and the vent slits but was easy to miss. Was I wrong as well to assume the two screws in the vent slit/ heatsink area are to secure part of the heatsink to the shell of the amplifier?
Roy_D
Active Member
But so far sonically very happily enjoying music - the amplifier is performing well
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When you shut down the machine with the remote control, all parameters will be remembered, just once.
Instead of directly cutting off the power.
Roy_D
Active Member
I thought I had switched off using the main control button on the amplifier last night. I just repeated this with volume set to 6 at the moment, switched off the mains power and waited a minute or so, then switched mains power back on and powered on the amplifier longpressing the volume/on off button as before and yes volume 6!
**edit and again with a few hour hiatus tye D3 Pro started back up with volume set where I had left it
Nevertheless I think it may save some buyers some unpleasant surprises Alexander if the amplifier did not have a factory volume setting of 40 ^_^
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There is a protective film on the screen surface, you can tear it off, it will be more beautiful.
Roy_D
Active Member
Yes I found the film.^^ Not un unattractive device this is. The display is clear and practical in living room situation being legible from a distance. Being able to set colour and brightness are welcome features.
The remote is responsive has a nice wide angle of range and all functions are easy and simple. Adjustable bass and treble for low listening levels is useful also. I note a little thin thump coming from speaker when going from +1 bass to 0 bass.
There are audible thin thumps switching the amp on and off and they happen with a few seconds of delay.
Input switching there are audible relais clicks in the back when selecting certain inputs and when switching the amp off.
Temperature seems independant of load. Playing for long period on volume 5 or 25 yields no meaningful difference in temperature which is around 42.5 maximum (highest near and at the display) (ambient temp is 24)
I've had set the amp on top of the included heatsink with the fins up and this has a bit if a positive effect on temperatures, basically by raising the amp off the surface. A C lower here and there. But temperature remains higher than I wish so I've set the d3 pro on top of a very quiet Be Quiet pwn fan which is inaudible at the level I set it to run at and the amp exterior now measures 35°C with ambient temperature of the room at 24.4.
Or is the amp case at 42C° fine and nothing to worry about @Alexander Lin ?
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The remote is responsive has a nice wide angle of range and all functions are easy and simple. Adjustable bass and treble for low listening levels is useful also. I note a little thin thump coming from speaker when going from +1 bass to 0 bass.
There are audible thin thumps switching the amp on and off and they happen with a few seconds of delay.
Input switching there are audible relais clicks in the back when selecting certain inputs and when switching the amp off.
Temperature seems independant of load. Playing for long period on volume 5 or 25 yields no meaningful difference in temperature which is around 42.5 maximum (highest near and at the display) (ambient temp is 24)
I've had set the amp on top of the included heatsink with the fins up and this has a bit if a positive effect on temperatures, basically by raising the amp off the surface. A C lower here and there. But temperature remains higher than I wish so I've set the d3 pro on top of a very quiet Be Quiet pwn fan which is inaudible at the level I set it to run at and the amp exterior now measures 35°C with ambient temperature of the room at 24.4.
Or is the amp case at 42C° fine and nothing to worry about @Alexander Lin ?
.
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Roy_D
Active Member
I received the manual from O-Noorus in my emal - it is too large to share on the forum sadly though but I can share the google drive link I got from them.
@Alexander Lin the format of the manual is problematic: it is one large page and on desktop webbrowser for example it refuses to zoom in to page level.
Even print option is problematic - it is having great difficulty handling this file and this is a very new up to date pc.. It can only print all pages as one page which makes it totally illegible and unusable.
Please have them reformat the PDF so it can be read and viewed as page by page booklet?
Also I am interested to see the frequency response graph to see how effective the pffb measures up - they are not included in the set in the pdf?
@Alexander Lin the format of the manual is problematic: it is one large page and on desktop webbrowser for example it refuses to zoom in to page level.
Even print option is problematic - it is having great difficulty handling this file and this is a very new up to date pc.. It can only print all pages as one page which makes it totally illegible and unusable.
Please have them reformat the PDF so it can be read and viewed as page by page booklet?
Also I am interested to see the frequency response graph to see how effective the pffb measures up - they are not included in the set in the pdf?
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Roy_D
Active Member
Just hours after replying to the mail from O-Noorus with the first version of the manual that the first iteration was impractical they sent me an updated version which can be found here
drive.google.com
D3 PRO-0613_English.pdf
drive.google.com
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