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

[Guddu]

Wonder if there's a signal sensing auto-on/off function when used as a power amp (BP mode).

There is no auto-ON/Off signal sensing feature for the amplifier, auto-ON/OFF is there only for screen display

 

[Pausi]

Dear FMs,

I am intending to post User Impressions & Observations here in this User Impressions | Owner's Thread.
pls note that Amir's measurements & review of this amplifier is in queue and awaited.

I created a thread on O-Noorus D1 which captures details like features, internal pics, quick discussions on several aspects, etc. when I came to know about this amplifier first time:
o-noorus-d1-tpa3255-pffb-stereo-amplifier-front-display-tone-control-with-bypass-and-remote

Here, I mean to summarize:
> what I get as a buyer or user of O-Noorus D1 amplifier
> aspects other than measurements that you might be interested in
> testing features & functions to see if there are any issues and how could get around those, if any
> I also hope that this thread could provide some information as to "what to expect" while you are buying this amplifier

*** I hope other O-Noorus D1 users/owners can also sum up their feedback and some work arounds here to help other potential future O-Noorus D1 owners ***

Here is quick snapshot of this amplifier:
> TPA3255 based PFFB implemented topology
> Front panel large display and volume pot with volume control/on/off/mode operation
> 2 Operational Modes
> BP => ByPass mode
> T&B => Tone mode
> Pre-Out with 3.5mm aux, volume controlled by amplifier's volume
> sub-out, with 80 Hz fixed low pass, volume controlled by amplifier's volume
> RCA input
> Remote
> Case Color: RED for now, manufacturer confirmed that BLUE will be available later
Note: RCA inputs only, no xlr/TRS balanced inputs

Price & Availability
> Price seems to be very reasonable, to me, for this amplifier
> seems like manufacturer is not asking for PFFB premium yet!

*** Amplifier is available on AliExpress at the moment, not on Amazon yet.
*** It's available with or with-out power supply
Note: I did not get this amplifier with power supply, and used a 48v 5a power supply all the time without any issues.

View attachment 366678


Look & Feel:
> Its quite compact profile, more or less similar to size of Topping E50 DAC
> They only have RED color available at the moment, and may make other colors available in future
> Feels decent case, looks very nice with shiny finish
> Looks cute under my TV. Low profile makes things really easy for placement however speaker cable termination requires some considerations
> Metallic heatsink is pasted onto TPA3255 chip which then also couples it to the chassis bottom, then the whole chassis operates as cooling solution
> Chassis also has ventilation on sides and bottom

View attachment 366673

Note: RCA input color coding is different than standard, however manufacturer confirmed that next batches would have this corrected.

Power Supply & Remote
> It comes with 36v 5a power supply
> 48 - 50v power supply can be used as well, as filter capacitors used are 63v

View attachment 366674

> Remote provided is rather simple, plastic made
> It does work fine, however personally I feel that they should upgrade and find a better remote
> I have already provided feedback to manufacturer, hope they act

Amplifier Mode: BP: ByPass
> It bypasses tone controls
> Remote becomes almost useless, it can only change mode when amplifier is on BP
> Note: Remote Volume Control on Remote does work in BP mode

View attachment 366685

Amplifier Mode: T&B: Treble&Bass, Tone Control
> Remote becomes fully functional, volume control on remote works
> Bass & Treble adjustments: -10 to +10 db
> Display LED Color: 1 to 8, 8 different colors
> Brightness: 1 to 3 and A4 => low, med, high and A4: Auto Off after about 10 sec
> Note: If you set A4 and then go back to BP mode, Auto Off still works

View attachment 366686

Volume Control Knob Operation:
> I found it very good, super smooth and responsive with digital control
> Press long for ON/OFF
> Press quick double to change modes: BP vs T&B
> Note: I could not figure out a way to change tones etc. using volume knob, and could only use remote for that.

Amplifier Internal or PCB Pictures: HERE
> Note: It uses Chemi-con Nippon KY 63v 2200uF capacitors, and dual power supply +-12v for opamps

Size comparison (size is same as O-Noorus D3): HERE

Idle Power Consumption: Powered ON but no audio playing
> Around 10watts
> Even, It keeps around 10watts if played arrox. up to 70-72 db SPL
View attachment 366687

Amplifier Case Temperature
> I played it a bit loud for my likings, around 80-85 db and the case remained just warm and I didn't think it could be an issue
> note: I used 48v 5a power supply all the time

My Setup, Connectivity and Pairing devices:
PC & nVidia Shield Pro (source) >>>> Topping E50 >>>>RCA out>>>> O-Noorus D1 >>>> Speaker Selector >>>> ELAC DBR62 Speakers
PC & nVidia Shield Pro (source) >>>> Topping E50 >>>>balanced out>>>> Fosi v3 Mono Amplifiers >>>> Speaker Selector >>>> ELAC DBR62 Speakers

View attachment 366681

View attachment 366682

Sub-Out
> I tested with my ELAC powered sub, it worked fine without any issues
> Amplifier volume control also controls the sub-out (and pre-out as well)

Illusional and Delusional Stuff - How I feel about O-Noorus D1 after listening for few hours

Note: you might want to ignore this part as its purely based on my setup, in-room response and my likings.

There was no huss or noise on full volume on my Elac DBR62 speakers, amplifier was dead silent and clean.
Sound wise, there isn't much to say really, it worked as good as any other amplifier in my setup. it felt detailed and quite balanced to my likings.

Take a look at the following quick freq. sweep captured with mic placed near to speaker, and tell me what can you make out of it:

View attachment 366688
Your assessment of the above graph is welcome!

Some considerations and notes:
> Speaker binding post is small, just like other similar amplifiers, and so its more suitable & safe for banana plugs than bare wire or spades
> Remote provided works, but I would personally try to see if a can find a universal remote that works with it
> Sub-Out RCA plug is of RED color coded in my unit, so I mistakenly connected normal RCA input a few times. Not really an issue, but just requires careful connection once
> A faint pop noise is there when switching/changing mode: BP & T&B, and when powering off the amplifier. Its nor sharp noise like many others but it is there.
> I had Topping E50 next to it, and when I used E50's remote to change anything it also showed option moving on O-Noorus D1. It did not change any settings or anything, did not cause any issues but I observed this. To verify, I tried using E50's remote directly on the amplifier and it did not do anything other than browsing menu.

Overall, it is compact good looking amplifier with many features which aren't there with other PFFB based amplifiers yet.
It is RCA input only, no balanced inputs but I personally didn't find it an issue specially on this price.
It performed really good in my setup, can not say anything for long term reliability to be honest but it feels well built except the remote which works but I wish if they could do better.

I have tried the D1 with a 48V/5A PS and the Sparkos SS3602 op-amps. Combined with Wiim Pro Plus and Linton speakers. Sound quality pretty good and OK punch. Separation and soundstage not as good as Fosi V3 or ZA3 even when they use stock NE5532 op-amps and D1 has Sparkos in. D1 gets hot, 45-48 degree Celsius in both idle and active mode. Tried it with a 36V/6A PS from Aiyima (yes 6A, not 5) and temperature was a lot better, only lukewarm, but it lost a lot of its punch and the sound became much more flat. All in all a nice little TPA3255 PFFB power amp. If I understood O-Noorus correctly, from the correspondence through Aliexpress, they are working on a dual TPA3255 version, both balanced input and RCA and with a larger chassis. Interesting yes.

 

[Corvuscorone]

Dear FMs,

I am intending to post User Impressions & Observations here in this User Impressions | Owner's Thread.
pls note that Amir's measurements & review of this amplifier is in queue and awaited.

I created a thread on O-Noorus D1 which captures details like features, internal pics, quick discussions on several aspects, etc. when I came to know about this amplifier first time:
o-noorus-d1-tpa3255-pffb-stereo-amplifier-front-display-tone-control-with-bypass-and-remote

Here, I mean to summarize:
> what I get as a buyer or user of O-Noorus D1 amplifier
> aspects other than measurements that you might be interested in
> testing features & functions to see if there are any issues and how could get around those, if any
> I also hope that this thread could provide some information as to "what to expect" while you are buying this amplifier

*** I hope other O-Noorus D1 users/owners can also sum up their feedback and some work arounds here to help other potential future O-Noorus D1 owners ***

Here is quick snapshot of this amplifier:
> TPA3255 based PFFB implemented topology
> Front panel large display and volume pot with volume control/on/off/mode operation
> 2 Operational Modes
> BP => ByPass mode
> T&B => Tone mode
> Pre-Out with 3.5mm aux, volume controlled by amplifier's volume
> sub-out, with 80 Hz fixed low pass, volume controlled by amplifier's volume
> RCA input
> Remote
> Case Color: RED for now, manufacturer confirmed that BLUE will be available later
Note: RCA inputs only, no xlr/TRS balanced inputs

Price & Availability
> Price seems to be very reasonable, to me, for this amplifier
> seems like manufacturer is not asking for PFFB premium yet!

*** Amplifier is available on AliExpress at the moment, not on Amazon yet.
*** It's available with or with-out power supply
Note: I did not get this amplifier with power supply, and used a 48v 5a power supply all the time without any issues.

View attachment 366678


Look & Feel:
> Its quite compact profile, more or less similar to size of Topping E50 DAC
> They only have RED color available at the moment, and may make other colors available in future
> Feels decent case, looks very nice with shiny finish
> Looks cute under my TV. Low profile makes things really easy for placement however speaker cable termination requires some considerations
> Metallic heatsink is pasted onto TPA3255 chip which then also couples it to the chassis bottom, then the whole chassis operates as cooling solution
> Chassis also has ventilation on sides and bottom

View attachment 366673

Note: RCA input color coding is different than standard, however manufacturer confirmed that next batches would have this corrected.

Power Supply & Remote
> It comes with 36v 5a power supply
> 48 - 50v power supply can be used as well, as filter capacitors used are 63v

View attachment 366674

> Remote provided is rather simple, plastic made
> It does work fine, however personally I feel that they should upgrade and find a better remote
> I have already provided feedback to manufacturer, hope they act

Amplifier Mode: BP: ByPass
> It bypasses tone controls
> Remote becomes almost useless, it can only change mode when amplifier is on BP
> Note: Remote Volume Control on Remote does work in BP mode

View attachment 366685

Amplifier Mode: T&B: Treble&Bass, Tone Control
> Remote becomes fully functional, volume control on remote works
> Bass & Treble adjustments: -10 to +10 db
> Display LED Color: 1 to 8, 8 different colors
> Brightness: 1 to 3 and A4 => low, med, high and A4: Auto Off after about 10 sec
> Note: If you set A4 and then go back to BP mode, Auto Off still works

View attachment 366686

Volume Control Knob Operation:
> I found it very good, super smooth and responsive with digital control
> Press long for ON/OFF
> Press quick double to change modes: BP vs T&B
> Note: I could not figure out a way to change tones etc. using volume knob, and could only use remote for that.

Amplifier Internal or PCB Pictures: HERE
> Note: It uses Chemi-con Nippon KY 63v 2200uF capacitors, and dual power supply +-12v for opamps

Size comparison (size is same as O-Noorus D3): HERE

Idle Power Consumption: Powered ON but no audio playing
> Around 10watts
> Even, It keeps around 10watts if played arrox. up to 70-72 db SPL
View attachment 366687

Amplifier Case Temperature
> I played it a bit loud for my likings, around 80-85 db and the case remained just warm and I didn't think it could be an issue
> note: I used 48v 5a power supply all the time

My Setup, Connectivity and Pairing devices:
PC & nVidia Shield Pro (source) >>>> Topping E50 >>>>RCA out>>>> O-Noorus D1 >>>> Speaker Selector >>>> ELAC DBR62 Speakers
PC & nVidia Shield Pro (source) >>>> Topping E50 >>>>balanced out>>>> Fosi v3 Mono Amplifiers >>>> Speaker Selector >>>> ELAC DBR62 Speakers

View attachment 366681

View attachment 366682

Sub-Out
> I tested with my ELAC powered sub, it worked fine without any issues
> Amplifier volume control also controls the sub-out (and pre-out as well)

Illusional and Delusional Stuff - How I feel about O-Noorus D1 after listening for few hours

Note: you might want to ignore this part as its purely based on my setup, in-room response and my likings.

There was no huss or noise on full volume on my Elac DBR62 speakers, amplifier was dead silent and clean.
Sound wise, there isn't much to say really, it worked as good as any other amplifier in my setup. it felt detailed and quite balanced to my likings.

Take a look at the following quick freq. sweep captured with mic placed near to speaker, and tell me what can you make out of it:

View attachment 366688
Your assessment of the above graph is welcome!

Some considerations and notes:
> Speaker binding post is small, just like other similar amplifiers, and so its more suitable & safe for banana plugs than bare wire or spades
> Remote provided works, but I would personally try to see if a can find a universal remote that works with it
> Sub-Out RCA plug is of RED color coded in my unit, so I mistakenly connected normal RCA input a few times. Not really an issue, but just requires careful connection once
> A faint pop noise is there when switching/changing mode: BP & T&B, and when powering off the amplifier. Its nor sharp noise like many others but it is there.
> I had Topping E50 next to it, and when I used E50's remote to change anything it also showed option moving on O-Noorus D1. It did not change any settings or anything, did not cause any issues but I observed this. To verify, I tried using E50's remote directly on the amplifier and it did not do anything other than browsing menu.

Overall, it is compact good looking amplifier with many features which aren't there with other PFFB based amplifiers yet.
It is RCA input only, no balanced inputs but I personally didn't find it an issue specially on this price.
It performed really good in my setup, can not say anything for long term reliability to be honest but it feels well built except the remote which works but I wish if they could do better.

I measured the frequency response of my listening location with the Spectroid application on my mobile phone and the pink noise. The Rega Elex-R was used as a preamplifier and the O-Noorus D1 power amplifier with the Aiyima GaN 48V 5A power supply. Pink Noise was played from the Internet via Bluetooth to the Sabaj a20d dac. I used big diy three-way cardioid floorstanders and the HSU VTA-3 mk3 subwoofer. The subwoofer was connected to the O-Noorus D1 sub output. Just room measurement, PB mode and no equalization. A few bumps and spikes in the frequency response due to my speakers and room mode.

 

[Jukka]

I've been looking for a desktop amp for some time now and stumbled upon this O-Noorus brand that I've never heard before. D1 is about the same price as Fosi V3 and considerably cheaper than Aiyima A70. However there is very little info about this company. They do have a web site but there are no reliable sources for performance indicators. But it's so RED that I want it!
Does anyone have measurements or other info about quality or reliability?

 

[KaeliKoo]

I ordered a O-Noorus thru Amazon about 6 months ago. The order was delayed twice and ship date moved, finally Amazon just cancelled the order saying "Not Available" and I basically punted on anything O-Noorus - but the D1 intrigued me, no doubt.

 

[Guddu]

I don’t think O-Noorus are operating through Amazon properly, I had to get those through Aliexpress.

But it's so RED that I want it!

RED and Blue both look amazingly cool, I have both.

Does anyone have measurements or other info about quality or reliability?

There isn’t much to think about on this price really, even if they are just around any other TPA3255 measurements them still price, looks and features are hard to beat.
If you don’t mind minor quirks then D3 & D1 are good enough, unless you get a faulty unit.

 

[Bleib]

As I'm the one who pointed out that I had a faulty unit I should perhaps add that they fully refunded my purchase
They didn't ignore me or anything (which has happened with another purchase through ali from another company).. so I'd still say that it's worth for its price.

Probably not worth using with a 48v / 5A PSU though, I tried this with a D3 and it becomes quite hot which I don't like

 

[Alexander Lin]

It is now available on Amazon North America. You can see it by searching the brand name.

 

[Guddu]

It is now available on Amazon North America. You can see it by searching the brand name.

Cool…. Now I see D1 & D3 both on Amazon US.
D3 picture has a bigger knob, any internal change there on D3?

 

[Alexander Lin]

Cool…. Now I see D1 & D3 both on Amazon US.
D3 picture has a bigger knob, any internal change there on D3?

Nothing changes.

 

[UAN]

I bought the O-noorus D1 amplifier because it contains PFFB. And indeed, its sound does not depend on the type of acoustics.I measured distortion at a power of 5 W, it turned out to be no more than 0.001% at a frequency of 1000 Hz.

 

[TonyJZX]

truth in advertising, how wonderful

i think this represents the best value for money... i see that the competition doesnt have a screen or remote... if you care about those things... maybe you dont

but if they dont impact SQ then why not?

the next step up is still the A70 at twice the price?

sometthing shound be done about that

 

[Jukka]

I bought the O-noorus D1 amplifier because it contains PFFB. And indeed, its sound does not depend on the type of acoustics.I measured distortion at a power of 5 W, it turned out to be no more than 0.001% at a frequency of 1000 Hz.

Could you repeat the distortion measurement for 5 kHz and multitone 19 & 20 kHz, please? These are the measurements that set these TPA3255 amps apart.

 

[UAN]

Could you repeat the distortion measurement for 5 kHz and multitone 19 & 20 kHz, please? These are the measurements that set these TPA3255 amps apart.

Ok!

 

[Audiovue]

Do not buy these product received doa from o-noorus allieexpress canada and they charge for return the price paid for it. Only one side work. O- noorus want to send a relay for repair.
Never buy from theese cheap company.
Thats the last message received for us.

Hi, Robert
I checked the order and you bought it from AliExpress. You can apply for a return and refund on the AliExpress platform, and the money will be returned to you in full.
If there is a problem with D1, please return the product for a refund.
If any user says that the product is defective after receiving it, I have to send another one. This operation is unreasonable.
Thank you for your understanding.
What is your Google guide link? I am interested in cooperation.
Thank you.
--

Marco Yin
onoorus marketer,

+8615914387571 | www.o-noorus.com | onoorus@gmail.com XinAnTown，BaoAn District ShenZhen City guangdong Province. CHINA

I am angry never buy again.
Be aware look like fraud.

 

[Alexander Lin]

Do not buy these product received doa from o-noorus allieexpress canada and they charge for return the price paid for it. Only one side work. O- noorus want to send a relay for repair.
Never buy from theese cheap company.
Thats the last message received for us.

Hi, Robert
I checked the order and you bought it from AliExpress. You can apply for a return and refund on the AliExpress platform, and the money will be returned to you in full.
If there is a problem with D1, please return the product for a refund.
If any user says that the product is defective after receiving it, I have to send another one. This operation is unreasonable.
Thank you for your understanding.
What is your Google guide link? I am interested in cooperation.
Thank you.
--

Marco Yin
onoorus marketer,

+8615914387571 | www.o-noorus.com | onoorus@gmail.com XinAnTown，BaoAn District ShenZhen City guangdong Province. CHINA

I am angry never buy again.
Be aware look like fraud.

On AliExpress, the return costs are borne by the seller.

 

[Audiovue]

Sur AliExpress, les frais de retour sont à la charge du vendeur.

Ils ne veulent pas.

 

[Audiovue]

Never buy these ch8neese shit again, after sending pics and video do not accept refund fid o- noorus d1 defective

 

[UAN]

My noorus D1 has started to crash, the signal at the amplifier output is disappearing. And on both channels at once. Looks like bad contact on the board, namely on the RCA input panels.
We need to disassemble and solder.
Colleagues, maybe someone disassembled this amplifier, I can't take the board out of the case.

 

[Guddu]

Never buy these ch8neese shit again, after sending pics and video do not accept refund fid o- noorus d1 defective

It isn’t looking good, did you try contacting the seller directly on Aliexpress?