O-Noorus D1 [TPA3255 PFFB] Stereo Amplifier - User Impressions | Owner's Thread

[Tell]

"Both D1 and BRU5 are around 50 Celsius aka. 122 Fahrenheit without active cooling after heavy usage."

That is weird, my 30+ years old Quad 306, after hours and hours of playing barely exceeds 40 Celsius, and that's a class AB design.

I thought class D was supposed be be efficient?

Yeah but then how much bigger is your Quad and it's heat sinks? And how much more power does it give to your speakers while pulling how much from the wall?

 

[AdrianusG]

Yeah but then how much bigger is your Quad and it's heat sinks? And how much more power does it give to your speakers while pulling how much from the wall?

Techspecs as below

Specifications​

Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 13Hz to 40kHz

Total harmonic distortion: 0.03%

Input sensitivity: 0.375V

Signal to noise ratio: 105dB

Dimensions: 321 x 64 x 207mm

Weight: 4.62kg

I don't play terribly loud, (at least not always), but still, it's not very big either, and as said even after many hours of use it's between 35 and 40 C max.

 

[tomriddle]

Yeah but then how much bigger is your Quad and it's heat sinks? And how much more power does it give to your speakers while pulling how much from the wall?

that temprature is normal if u try any tpa3255 amp with the up limit voltage psu. anything above 36v will make the amp hot. if 51v, u must use active cooling, for 48v fan is not necessary but a good practice. it's not like cpu or gpu, the chip's heat is easy to control. the higher voltage it gets, the better performance on most of tpa chips

as for my speaker they are 8inch with four frequencies splitor, 2 tremble 1mid 1 bass. 8 om labled 80 watts peak at 160watts. D1 will make them really loud but i only use at about 75db at about 3 meter away. amp draws only about 10-15 watts for one D1 on LR main speakers from the wall in my case.

the so called 90% efficiency or labeled thd has voltage conditions, but in general class D is more efficient, it doesn't need that large heat sink like class ab.

if u don't like heat, try infieon ma12070 chip, this class d chip doesn't require any heat sink, but with much less power.

in general tpa3255 is the current best choice for class D, heat is not an issue for these tested product. i use fan because my home near tropical region air temp can reach 38 Celsius.

 

[Krampi]

that temprature is normal if u try any tpa3255 amp with the up limit voltage psu. anything above 36v will make the amp hot. if 51v, u must use active cooling, for 48v fan is not necessary but a good practice. it's not like cpu or gpu, the chip's heat is easy to control. the higher voltage it gets, the better performance on most of tpa chips

as for my speaker they are 8inch with four frequencies splitor, 2 tremble 1mid 1 bass. 8 om labled 80 watts peak at 160watts. D1 will make them really loud but i only use at about 75db at about 3 meter away. amp draws only about 10-15 watts for one D1 on LR main speakers from the wall in my case.

the so called 90% efficiency or labeled thd has voltage conditions, but in general class D is more efficient, it doesn't need that large heat sink like class ab.

if u don't like heat, try infieon ma12070 chip, this class d chip doesn't require any heat sink, but with much less power.

in general tpa3255 is the current best choice for class D, heat is not an issue for these tested product. i use fan because my home near tropical region air temp can reach 38 Celsius.

@tomriddle
You are a lucky man to live in this temperature region. I envy you

 

[tomriddle]

@tomriddle
You are a lucky man to live in this temperature region. I envy you

well nice music can adjust temperature and mood isn't it.

 

[tomriddle]

btw my first tpa3255 amp is actually BRZHIFI x30z, the good thing is it has an integrated 36v psu and qcc3084 bluetooth, but but it has coil whine from the box. refunded immediately. that amp is not so hot though.

 

[tomriddle]

View attachment 380703View attachment 380704View attachment 380705

hey i think u misunderstood what they was saying, the translated message was wrong.

订单退款不退货 actually means the order will be refuned without sending back the product.

they were refunding anyway.

 

[Krampi]

I fitted the O-Noorus D1 with the Aiyima 48V 10A GaN power supply just for the sake of interest.

It sounds better to my ears, although the standard power supply with 36V and 5A is also perfectly OK for listening to music at a high level.

But: The small amplifier gets considerably warmer under load and reaches surface temperatures of 46 degrees Celsius.

Although this is within the specifications, lower temperatures are always better for electronic components.

So I didn't order a cheap heat sink, but a 0.51 K/W heat sink, which is a little oversized and also a little too big, because I didn't take into account in the dimensions that they are of course given "over all", i.e. with connections, and not just for the housing itself.

So I briefly considered exchanging it, but then simply fixed it in place with thermal tape.

The small and stylish amplifier now has Morgoth's crown on its back and plenty of current and voltage available.
It is barely warm to the touch, even at high levels over long periods of time.

Is this all sensible and economical?
Probably not, but I enjoy it.

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@Audionaut
Hi, What kind of glue did you use to glue the heat sink on and where did you get it?
Thank you! K'

 

[Audionaut]

Hi, What kind of glue did you use to glue the heat sink on and where did you get it?

https://www.amazon.de/dp/B098NJL48P

I cut the excess with a cutter knife

 

[Audionaut]

A little handicraft lesson.
The red profiles are great, but the spikes I still had here are too high.
With the heat sink and the spikes, it looks like an imperial construct from Star Wars.
But with the red aluminum profiles and the original rubber feet it's OK and the amplifier has better convection from below.

 

[ICIETDIYEUR]

Hello Audionaut

I really appreciate people with imagination, and you certainly have it: this is very well done

I suggested (among others...) to Alexander Lin (O-NOORUS) that he use an AUDIOANALYSE A9-inspired enclosure (on display at M.O.M.A) to create a 'simple' high-end stereo amplifier model with two TPA3255 chips in PBTL mode at 100% of their capacity.

It would consist of two mono PCBs with their chips cooled by external fins mounted on the sides of the unit. The central part (physically isolated from each of the two mono modules) would contain two 600W rms PSUs (one for each mono module).

Ventilations (with a VENTURI effect) would be provided at the top and bottom to cool the PSUs.

The device would have a simple volume knob and indicator light on the front panel and an on/off switch on the back, along with a 12V trigger jack and a bypass for the volume function, making it suitable for use as a power amplifier.

A price like that of the latest SMSL VMV A1 Pro should be possible to offer, making it a serious competitor in the modern amplifier market with very good features.

I'm sure such a device would attract a good number of potential buyers

 

[Audionaut]

create a 'simple' high-end stereo amplifier model with two TPA3255 chips in PBTL mode at 100% of their capacity.

A very good project.
I've been waiting a long time for an ultimate 3255 amplifier that fully exploits the architecture.
But why 2 x 600 watts? Isn't 300 watts per side enough?

 

[ICIETDIYEUR]

You said: "I've been waiting a long time for an ultimate 3255 amplifier that fully exploits the architecture."

So 600W for one TPA3255, so 600W per channel (one TPA3255 in PBTL mode per PCB for each channel)

NB: This type of amplifier exists in the DIY world, as I've built one myself with a 1200W PSU

However, I don't know of any comparable device on the market, at least not at a price that would be attractive to everyone...
...we'll just have to wait for a manufacturer to offer one

 

[Audionaut]

So 600W for one TPA3255, so 600W per channel (one TPA3255 in PBTL mode per PCB for each channel)

NB: This type of amplifier exists in the DIY world, as I've built one myself with a 1200W PSU

I've never read that before. As far as I know, a TPA3255 in PBTL with a good layout and 52 V power supply can deliver a maximum of between 250 and 350 watts into 4 ohms.

 

[ICIETDIYEUR]

Hi.


You are probably right audionaut: TI designed this chip and they write nonsense, you will have to inform them to prevent them from appearing like imbeciles...