TPA3255 - all about DIY, Discussion, Design etc

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#4,005
daniboun said:
Hi amigos,

I gave a test with the HanZao TPA3255 + OPA1692, I think it is the very first time they have been tested here with the TPA325X chip.

AMAZING OP AMPS !!!!!! Wouaaaaaaaaaaaa
An incredible definition! the highs are so good! The voices stand out wonderfully on the front of the stage, it's clean and what a soundstage! Love it )

Here are some videos, they are worth what they are worth but it gives an idea from a distance)

Video 1

HanZao TPA3255 OPA1692

Video 2

HanZao TPA3255 OPA1692 B
Click to expand...

Hi, where did you buy them?
 
#4,010
Polevka said:
I use this one.
The difference in the price / quality ratio.
You get 4 BTL channels for the price of two.
But, I immediately replaced the TL 071.
It is possible to switch to 1PBTL + 2BTL mode.
I have three speakers in each speaker. I connect the PBTL channel at the low frequency, and at the midrange and high frequencies through the BTL channel.
It is not recommended to use a power supply with a voltage higher than 36 volts.
On your first link, a similar amplifier, only on TPA 3251
It will heat up less because it has a better radiator.
The rest I don't know, newer developments.
The only real advantage is the price.
Click to expand...

Hi Polevka,
What kind of audio source so you use for your active speakers? I use computer sources exclusively, which has been great for Stereo with a USB DAC, but I'm having difficulty finding a decent 4-8 channel DAC at an acceptable price which I can use to feed active speakers (note that I plan for the computer to also perform DSP functions, probably using CamillaDSP)

thanks
 
#4,011
redger said:
Hi Polevka,
What kind of audio source so you use for your active speakers? I use computer sources exclusively, which has been great for Stereo with a USB DAC, but I'm having difficulty finding a decent 4-8 channel DAC at an acceptable price which I can use to feed active speakers (note that I plan for the computer to also perform DSP functions, probably using CamillaDSP)

thanks
Click to expand...
Hello Australia!
I am not using 5.1 sound. Only 2.0.
The main sound source is TASCAM UH-7000.
Active crossover Berenger DCX2496.
Vinyl is first recorded on the hard drive, then I listen.
Turntable Dual 1229.
Homemade acoustics, three-way, active.
LF - 15 "(Back horn), MF - YAMAHA JA6681B (horn), HF - Realistic 40-1310A.

P.S. By the way, I learned a lot from the Lenard Audio website. An excellent engineer. I recommend his site to study ... 🙂
 
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#4,012
Polevka said:
Hello Australia!
I am not using 5.1 sound. Only 2.0.
The main sound source is TASCAM UH-7000.
Active crossover Berenger DCX2496.
Vinyl is first recorded on the hard drive, then I listen.
Turntable Dual 1229.
Homemade acoustics, three-way, active.
LF - 15 "(Back horn), MF - YAMAHA JA6681B (horn), HF - Realistic 40-1310A.

P.S. By the way, I learned a lot from the Lenard Audio website. An excellent engineer. I recommend his site to study ... 🙂
Click to expand...

Hi from New Zealand (long story but I moved here for a while - family reasons)

Interesting you use "pro" equipment - I've been coming round to that too as it seems to offer quite good quality sound for a "reasonable" price. So far I've looked at Motu and Behringer for 4 channel ie. ie stereo split into 4 channels for 2 * 2-driver speakers. 3 way speakers would be better but technical challenges and costs seem to increase quite rapidly with driver count

I'm in my 60s so hearing isn't all that great but seems good enough to have determined which DAC I prefer as source, so can't be disastrous yet 🙂

Thanks again for your feeback, I appreciate it, helping me a lot :up:
 
#4,013
redger said:
I'm in my 60s so hearing isn't all that great but seems good enough to have determined which DAC I prefer as source, so can't be disastrous yet 🙂

Thanks again for your feeback, I appreciate it, helping me a lot :up:
Click to expand...
I am 58 years old. I only hear up to 14 kHz.
Therefore, the level of the second and even more so the third harmonic after 7 kHz I'm not interested ... 🙂
I checked my equipment, what level of noise I do not hear at a comfortable volume level of listening to music. It turned out to be slightly less than -70 dB. Therefore, I am not chasing -150 dB signal-to-noise ratio. I do not need it. Berenger has only -90dB, that's enough for me.
Вот так он разделяет частотный диапазон.
On the graph you can see the noise level after the entire chain (sound card, crossover, amplifier, load). It is no more than -90 dB. Measurements at 5 watts.
 

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#4,014
Polevka said:
I am 58 years old. I only hear up to 14 kHz.
Therefore, the level of the second and even more so the third harmonic after 7 kHz I'm not interested ... 🙂
On the graph you can see the noise level after the entire chain (sound card, crossover, amplifier, load). It is no more than -90 dB. Measurements at 5 watts.
Click to expand...

That's pretty good. I'm sensitive to audio "inconsistency" rather than "noise".

It looks like the TPA325x are good enough to satisfy the hearing of the 2 of us anyway :cheers:
 
#4,016
Hi amigos,

I found a small alternative to the TPA3255 with a definite advantage, a very interesting dual Mono implementation! Sounds really great at first listen.
The amp is tiny : 134x59x90mm


- OPA1652
- Panasonic FC Power caps
- WIMA caps
- Elna Audio Grade buffer caps
- Evox Film caps
- TPA3221 main chip
- PSU 15V / 7A

At first listening, amplifier is dead silent and sound awesome !
Will give a long listening test later vs Hypex vs Purifi.

Videos :

VID_20210329_205042
VID_20210329_205219

Some pictures in te meanwhile :







 
#4,020
Nice amp and mechanical construction!
I wonder about the 15V though.

Assuming they did dual mono to use each chip in PBTL-mode, 15V is just 25W in 4Ohms (1%THD) and probably half that into 8Ohms.

The main caps are 35V so they might have planned for ~30V initially!?
Either they tested very conservatively with sinewaves and found the heatsink hot enough at 15V supply voltage or they had other problems with the amp at higher voltages (oscillation or simply that the 5V regulator gets too hot).
 
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