Which TPA3255 amp do you recommend?

[Berlyassocial]

Hi, go a few pages back...
SNR : about 117DB

Sounds really good. The fact that they have included air core Inductors itself reflect top quality. Any update on estimated pricing

 

[BDWoody]

Hi, go a few pages back... I shared some info and the unique picture we have for the moment )
It will be equiped with a very special low noise PSU and some Air Core Inductors, dual inputs XLR / RCA and other very innovative updates.

I can share the measurements again :

Allo TPA3255 (to be confirmed in ASR)
THD+N 5W , 1Khz 0.00014
THD+N 100W 20-20Khz 0.0097
THD+N 10W 20-20Khz 0.0091
SNR : about 117DB

How about some controlled listening tests of the results of these updates.

Lots of claims made... Would love to see some controlled tests if you are going to say it sounds better.

 

[daniboun]

Sounds really good. The fact that they have included air core Inductors itself reflect top quality. Any update on estimated pricing

A few people know only : Air Core inductors were already used with the FX Audio FX502SPRO / TPA3250
But the new ALLO TPA3255 seems promising... to be confirmed anyway )

 

[daniboun]

How about some controlled listening tests of the results of these updates.

Lots of claims made... Would love to see some controlled tests if you are going to say it sounds better.

ASR would receive a sample to confirm as well...
I agree for the moment, lots of claims but I want to trust Allo ) Let s wait folks

 

[Berlyassocial]

A few people know only : Air Core inductors

Not that aircore Inductors alone improves SQ. But ALLO usually go long ways to ensure the final product is solid. Also the fact that this upcoming amp has been in R&D for a long time, started seeing rumors of volt+D successor for a few years now. So I anticipate it's gonna be a well executed product

 

[daniboun]

Not that aircore Inductors alone improves SQ. But ALLO usually go long ways to ensure the final product is solid. Also the fact that this upcoming amp has been in R&D for a long time, started seeing rumors of volt+D successor for a few years now. So I anticipate it's gonna be a well executed product

I am confident )
Keep in mind it is going to be a finished amp, with internal SMPS PSU and new OP amps inside as well (must be confirmed I know).

Everything is on the road )

 

[howard416]

Hi, go a few pages back... I shared some info and the unique picture we have for the moment )
It will be equiped with a very special low noise PSU and some Air Core Inductors, dual inputs XLR / RCA and other very innovative updates.

I can share the measurements again :

Allo TPA3255 (to be confirmed in ASR)
THD+N 5W , 1Khz 0.00014
THD+N 100W 20-20Khz 0.0097
THD+N 10W 20-20Khz 0.0091
SNR : about 117DB

Too many zeroes for the 5W measurement?

 

[daniboun]

Too many zeroes for the 5W measurement?

No, so you can compare :

Bosc Gan Murata PSU (Starkrimson) :
THD+N 5W , 1Khz : 0.0004%

Jlester TPA3255 + LLC PSU
THD+N 5W , 1Khz : 0.0016%

Purifi + Hypex PSU
THD+N 5W , 1Khz 0.0006%

 

[howard416]

No, so you can compare :

Bosc Gan Murata PSU (Starkrimson) :
THD+N 5W , 1Khz : 0.0004%

Jlester TPA3255 + LLC PSU
THD+N 5W , 1Khz : 0.0016%

Purifi + Hypex PSU
THD+N 5W , 1Khz 0.0006%

So the THD+N is 4 times less than with the Purifi? Seems great, world's best, actually, but honestly not sure how they are getting that from the TPA3255.

 

[oursmagenta]

So the THD+N is 4 times less than with the Purifi? Seems great but honestly not sure how they are getting that from the TPA3255.

Yeah especially w.r.t to the spec given by Ti itself (the 0.006% figure is at 1W though).
Edit: If this has already been posted I'd happily delete mine, or at least go for a thumbnail picture instead of a full image.

 

[daniboun]

So the THD+N is 4 times less than with the Purifi? Seems great, world's best, actually, but honestly not sure how they are getting that from the TPA3255.

I know it seems surprising ... I am announcing the results that have been presented to me. This is the reason why I added "to be confirmed" The result is better only at 5W.

If the results announced here are true, we can say that Allo will have exploited the architecture of the TPA3255 with a lot of nerve! I think you have to believe in the hidden potential of TPA3255) I wish it could be true )


Now look with some other measurements :

PURIFI :

THD+N 5W , 1Khz 0.0006
THD+N 100W 20-20Khz 0.00017
THD+N 10W 20-20Khz 0.00029
Sinad 5W / 4R : 108
SNR : 131DB (ASR shows 128DB)

BOSC Starkrimson Gan :

THD+N 5W , 1Khz : 0.0004%
THD+N 100W 20-20Khz : 0.0092%
THD+N 10W 20-20Khz 0.0025%
Sinad 5W / 4R : 105
SNR : 121DB

ALLO TPA3255 (to be confirmed) :

THD+N 5W , 1Khz 0.00014
THD+N 100W 20-20Khz 0.0097
THD+N 10W 20-20Khz 0.0091
SNR : about 117DB

 

[daniboun]

In any case, as soon as I get it in my hands, I could compare it to on Purifi below)

 

[Guddu]

In any case, as soon as I get it in my hands, I could compare it to on Purifi below)

is it audiophonics? Looks quite compact fit!!!

 

[daniboun]

is it audiophonics? Looks quite compact fit!!!

No, it is a DIY Purifi with a Custom Buffer. The Buffer is using 3 OP Amps (one Muse 03 and two Muse 02) The case is made in Italy by H2000 (GX serie full alu)

 

[Synergy4]

The Purifi uses feedback which includes output filter inductors to deal with the inductor ferromagnetic hysteresis: https://en.wikipedia.org/wiki/Magnetic_hysteresis

https://purifi-audio.com/2020/04/28/this-thing-we-have-about-hysteresis-distortion/

https://purifi-audio.com/2020/05/13/combating-hysteresis-distortion-part-1-amplifiers/

https://purifi-audio.com/2020/04/20/does-negative-feedback-cause-tim/

 

[howard416]

TPA3251 and TPA3255 have post-filter feedback (PFFB) as well

 

[daniboun]

TPA3251 and TPA3255 have post-filter feedback (PFFB) as well

Only in high end models (Drmordor / Jlester / / Xrk / Éval board)

 

[pma]

The main issue of the LC filter out of feedback is its high output impedance at higher frequencies and interaction with speaker complex impedance that modifies frequency response upwards from mid frequencies. This is audible and there is no other cure than feedback behind the filter. So all 1st generation topologies like TPA325X with LC filter behind the feedback are flawed and the result depends just on the speaker used and for the common user is unpredictable.

https://www.audiosciencereview.com/...ss-d-amplifiers-measurements.9940/post-647056

Amir does not measure with complex loads so the users do not get the info from his reviews. At least output impedance vs. frequency plot would help. Measurements into resistive load do not tell the story.

 

[howard416]

Only in high end models (Drmordor / Jlester / / Xrk / Éval board)

Right, I should've said "can have" PFFB.

 

[abdo123]

I'm looking for 4 channels of amplification with 100W capacitance at 8 ohm.

I know that TPA3255 is actually 4 channels in BTL to make 2 well powered stereo channels.

Are there any commercial (running out of box) solutions that i can use to reach that number? (at least above 50W at 8 ohm).

I'm also okay with buying two stereo units.