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Best Ti3255 Amplifier >>>Aiyima? Fosi Audio? O-Noorus?
- Thread starter Audionaut
- Start date
Actually, I meant this post.
www.audiosciencereview.com
There were also some 2-tone IMD measurements by the same poster, but apparently not here but maybe on diyaudio?
O-Noorus D1 - TPA3255 PFFB Stereo Amplifier - Front Display, Tone Control (with bypass) and Remote
People hi ! @ dr_mick51: You got it all figured out ;) The 220pF capacitors are a modification identical to the one proposed by Lester (SYLPH AUDIO) on its PCB in order to correct the appearance of the frequency response for the extreme treble which have a very slight rise -> ?? That graph...
www.audiosciencereview.com
There were also some 2-tone IMD measurements by the same poster, but apparently not here but maybe on diyaudio?
80% efficiency is absymal. I ordered a similar aluminum case power supply (without the display) from Aliexpress and returned it, simply because efficiency at 50% load was 81% and the fan was noisy and kept running all the time, even in idle. The efficiency was not even specified in that case.
What purpose does the display serve anyway? Btw, this case seems to be steel. Nothing wrong with it if you don't run the loudspeaker output cables near it, but it shows all the budget went into the display.
Decoded Oscillate
New Member
A small clarification - this gentleman is not from Ukraine, but from Russia. Information in the profile on YouTube.
please read post #22
facefirst
Member
Anyone else thinking these external power supplies places in a fancy enclosure that matches the amp would be a nice touch? The audiophile world loves a separate power supply but only if it is £3k and comes in its own chassis...
somebodyelse
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PFFB is not a feature of the chip at all. It's a feature of the circuit it is used in. TI provide an app note SLAA788A with guidance on how to ensure amp stability with PFFB for the TPA324x and TPA325x chip amps, with example component values and calculations to apply it to their evaluation modules. TI apply the feedback around the chip amp only, but it seems some manufacturers have taken it back to the opamp input, making a compound amp a bit like Neurochrome does to improve on the raw LM3886 performance.
Roland68
Major Contributor
Don't waste your money on such power supplies.
I recommend high-quality power supplies, e.g. from Mean Well from the HRP N or N3 series. These power supplies are ideal for such amplifiers, as they can briefly (for 5 seconds) deliver 2.5 or 3.5 times the power. So with a perfectly adequate 300 watt power supply, around 1000 watts for 5 seconds.
somebodyelse
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There is another mode for the TPA325x, Parallel Bridge Tied Load (PBTL), that can be used if you need to drive unusually low impedance loads like 2 Ohm. Most of the mono amps use this mode, while a few of the stereo amps use one TPA325x per channel in this mode. PBTL is only an advantage if you have an unusually low impedance speaker. A mono amp may be useful if you need to drive a passive sub, or have a long distance between player and speakers, and want to put an amp close to each speaker to keep speaker cables short. On paper there's probably a crosstalk advantage too, but in practice the stereo ones have crosstalk low enough that you wouldn't hear it in most situations.
OP
Audionaut
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- Thread Starter
- #35
So, is the O-Noorus D1 the best TPA3255 amplifier?
I don't know, because I only know two other models from my own experience, but it's certainly not the worst and has the PFFB circuit implemented.
The choice of TPA3255s with PFFB has expanded recently and I wavered between the Aiyima A70 or the Fosi V3 monos, but then decided in favor of the O-Noorus D1 because it has a remote control and display and the internal components don't seem any worse than those of its rivals.
The display color can also be customized, which is also a nice feature.
I ordered directly from O-Noorus.
The price for the complete package including power supply was 99 USD, which was the equivalent of around 95 euros in Germany. There was no customs duty.
As the FiiO BTA30 is currently more or less standing around here, I'm using it as a DAC to accept the optical signals from the WiiM mini, whose own DAC isn't particularly good.
The D1 replaces the small and, in my opinion, very good Nobsound Bluetooth amplifier with TPA3116 in my study.
Impressions of the O-Noorus D1 >>> Clean workmanship, not much bigger than the TPA3116 amplifier, so quite small. (footprint 170 mm x 120 mm)
The connections are functional and of standard quality.
It's nice that the FiiO and the O-Noorus are both 120mm wide and also similar in height.
I think that fits very well visually.
The D1 is therefore paired with the WiiM mini, which feeds the FiiO BTA30 with the AK 4490, which acts as a DAC, via an optical connection. From there it goes on to the small Elac BS 203 Anniversary with the in-house JET tweeter based on the Oskar Heil AMT principle.
The power supply unit supplied has 36V at 5A, which results in a total output of 180 watts. In purely mathematical terms, a maximum of 90 watts can be output on each channel, which is perfectly fine for me and the small Elac. So far, the power supply has remained cool even under high load or at high volume and does not emit any background noise. I doubt whether a more powerful power supply unit necessarily leads to a better sound, as I have already experienced the opposite.
I won't torture you again here on ASR with my subjective sound impressions, but I am very satisfied with the D1.
The O-Noorus D1 convinces me as a very inexpensive and powerful TPA3255 amplifier with PFFB implementation with a transparent sound image. Clear highs, natural mids and a tight bass foundation make for a satisfying listening experience. In my opinion, its transparency and spatiality also make it a good choice for more demanding listeners.
If you are looking for a compact, very inexpensive but (with the right power supply) powerful amplifier which, to my great delight, can also be operated remotely and has a display, you should give the O-Noorus D1 a listen.
The heat development remains moderate and has not caused any problems so far, which may be different with a larger power supply unit.
For me, I consider the TPA3255 experiment to be successfully completed for the first time.
I don't know whether I'll be buying any more amplifiers, because I'm actually already completely oversupplied, but I was just curious about such a small TPA3255 amplifier.
I can't imagine that the TP3255 PFFB designs differ too much in terms of sound, because the circuit designs around the actual chip are now tried and tested and largely exhausted, and some of the components are the same or at least very similar.
But Amir can and probably will measure this sufficiently.
PS
@Alexander Lin
The color assignment of the cinch connections should be changed, because it does not correspond to the standards and is a little confusing at first.
I could imagine that some people only pay attention to the colors and not to the labeling, so that they connect the right channel to the red subwoofer connection.
In my opinion, it would be better to label the stereo speaker pair in RCA red and white and the subwoofer in yellow or another color.
I don't know, because I only know two other models from my own experience, but it's certainly not the worst and has the PFFB circuit implemented.
The choice of TPA3255s with PFFB has expanded recently and I wavered between the Aiyima A70 or the Fosi V3 monos, but then decided in favor of the O-Noorus D1 because it has a remote control and display and the internal components don't seem any worse than those of its rivals.
The display color can also be customized, which is also a nice feature.
I ordered directly from O-Noorus.
The price for the complete package including power supply was 99 USD, which was the equivalent of around 95 euros in Germany. There was no customs duty.
As the FiiO BTA30 is currently more or less standing around here, I'm using it as a DAC to accept the optical signals from the WiiM mini, whose own DAC isn't particularly good.
The D1 replaces the small and, in my opinion, very good Nobsound Bluetooth amplifier with TPA3116 in my study.
Impressions of the O-Noorus D1 >>> Clean workmanship, not much bigger than the TPA3116 amplifier, so quite small. (footprint 170 mm x 120 mm)
The connections are functional and of standard quality.
It's nice that the FiiO and the O-Noorus are both 120mm wide and also similar in height.
I think that fits very well visually.
The D1 is therefore paired with the WiiM mini, which feeds the FiiO BTA30 with the AK 4490, which acts as a DAC, via an optical connection. From there it goes on to the small Elac BS 203 Anniversary with the in-house JET tweeter based on the Oskar Heil AMT principle.
The power supply unit supplied has 36V at 5A, which results in a total output of 180 watts. In purely mathematical terms, a maximum of 90 watts can be output on each channel, which is perfectly fine for me and the small Elac. So far, the power supply has remained cool even under high load or at high volume and does not emit any background noise. I doubt whether a more powerful power supply unit necessarily leads to a better sound, as I have already experienced the opposite.
I won't torture you again here on ASR with my subjective sound impressions, but I am very satisfied with the D1.
The O-Noorus D1 convinces me as a very inexpensive and powerful TPA3255 amplifier with PFFB implementation with a transparent sound image. Clear highs, natural mids and a tight bass foundation make for a satisfying listening experience. In my opinion, its transparency and spatiality also make it a good choice for more demanding listeners.
If you are looking for a compact, very inexpensive but (with the right power supply) powerful amplifier which, to my great delight, can also be operated remotely and has a display, you should give the O-Noorus D1 a listen.
The heat development remains moderate and has not caused any problems so far, which may be different with a larger power supply unit.
For me, I consider the TPA3255 experiment to be successfully completed for the first time.
I don't know whether I'll be buying any more amplifiers, because I'm actually already completely oversupplied, but I was just curious about such a small TPA3255 amplifier.
I can't imagine that the TP3255 PFFB designs differ too much in terms of sound, because the circuit designs around the actual chip are now tried and tested and largely exhausted, and some of the components are the same or at least very similar.
But Amir can and probably will measure this sufficiently.
PS
@Alexander Lin
The color assignment of the cinch connections should be changed, because it does not correspond to the standards and is a little confusing at first.
I could imagine that some people only pay attention to the colors and not to the labeling, so that they connect the right channel to the red subwoofer connection.
In my opinion, it would be better to label the stereo speaker pair in RCA red and white and the subwoofer in yellow or another color.
Last edited:
OP
Audionaut
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- #36
It should be noted that devices that have not yet been tested by Amir have a difficult time.
The number of posts and contributions from new owners in this forum regularly skyrockets as soon as a device has achieved a good result, as was the case with the Fosi V3 monos or the 3e TPA325x amplifiers, for example.
It is probably advisable for any company that wants to significantly increase its sales figures to send a device directly to Amir for testing rather than waiting for private individuals to take it over.
The number of posts and contributions from new owners in this forum regularly skyrockets as soon as a device has achieved a good result, as was the case with the Fosi V3 monos or the 3e TPA325x amplifiers, for example.
It is probably advisable for any company that wants to significantly increase its sales figures to send a device directly to Amir for testing rather than waiting for private individuals to take it over.
ICIETDIYEUR
Senior Member
Alexander LIN had done it with O-NOORUS D1 and D4 
Robertosimus
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It was supposed to come out this month but there were a lot of suggestions and requests about it, maybe they are still working on implementation. Its not released on the site yet.
OP
Audionaut
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- #40
Hello @ICIETDIYEUR ,
didn't your signature once say: O-Noorus D1 with modifications?
What happened? Smoked out because of modifications? ;-)
didn't your signature once say: O-Noorus D1 with modifications?
What happened? Smoked out because of modifications? ;-)
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