Breeze TPA3255 XLR Balanced Amplifier TearDown : DIP8 Op Amps.

[Roland68]

Anyone compared this soniccally with Fosi Audio V3 or ZA3?

I wonder too!
After all this hassle ... I really just want to know if this XLR version of an amp is usable in terms of reliability and accetpable sound. With or without pimping ...

The TPA3255 boards used by Breeze Audio largely correspond to the TI standard layout and I can't see any better components or improvements to the circuit/layout.
I've heard a few TPA3255 boards and, based on my experience, I can't imagine that they sound better than, for example, the Fosi Audio V3 or ZA3. I think even equivalent is unlikely.

Check out the newer TPA325x amplifiers/boards from Fosi, Aiyima, Sylph Audio, 3e Audio, Topping PA5 II, etc.
Or spend a little more money and buy a Sabaj A30a.

 

[SMen]

Anyone compared this soniccally with Fosi Audio V3 or ZA3?

I wonder too!
After all this hassle ... I really just want to know if this XLR version of an amp is usable in terms of reliability and accetpable sound. With or without pimping ...

I used this BRZ TPA3255 XLR Balanced to try out various things for my own curiosity. Probably / possibly because of the balanced nature of what I had feeding it, I preferred it to the Aiyima A07, A08 in stock form.

I am using Fosi V3 monos now. I'm not going to pitch in anything subjective as it has been a few months - might pop the BRZ back in to my system for the hell of it to see / hear. But it would not be equivalent as I am using the monos with a better volume control.

So yes more than acceptable, especially at the price, and for me reliable, despite being messed around with in various ways!

 

[yo!]

The TPA3255 boards used by Breeze Audio largely correspond to the TI standard layout and I can't see any better components or improvements to the circuit/layout.
I've heard a few TPA3255 boards and, based on my experience, I can't imagine that they sound better than, for example, the Fosi Audio V3 or ZA3. I think even equivalent is unlikely.

Check out the newer TPA325x amplifiers/boards from Fosi, Aiyima, Sylph Audio, 3e Audio, Topping PA5 II, etc.
Or spend a little more money and buy a Sabaj A30a.

That's to be expected, yes. The XLR option is a tempting feature and the amp doesn't look too bad, and yes, I like built in power supplies. As long as they keep up with correct standards and parts, it's OK so far. Sure, you can not expect big coils or generous caps.

 

[Choit]

Just got this amp. I get hissing on either XLR or RCA. The hiss is very loud when volume is turned up.
In comparison, my Aiyima A07 is silent at max volume and it is only RCA.

Anyone else have this problem?

Thanks

 

[Toku]

Just got this amp. I get hissing on either XLR or RCA. The hiss is very loud when volume is turned up.
In comparison, my Aiyima A07 is silent at max volume and it is only RCA.

Anyone else have this problem?

Thanks

These kinds of Chinese products often contain fake opamps. Try replacing the opamps.
If you don't have a spare op amp, you can use the AIYIMA A07 without the op amp. You don't need to replace all the op amps. Replace one and check the change in noise.
In China, manufacturing factories sometimes maliciously replace the op amps with fake ones.

 

[Choit]

These kinds of Chinese products often contain fake opamps. Try replacing the opamps.
If you don't have a spare op amp, you can use the AIYIMA A07 without the op amp. You don't need to replace all the op amps. Replace one and check the change in noise.
In China, manufacturing factories sometimes maliciously replace the op amps with fake ones.

Thanks for quick response!
Have not tried to replace an op amp before. But there's a first time for everything. .

 

[antcollinet]

Just got this amp. I get hissing on either XLR or RCA. The hiss is very loud when volume is turned up.
In comparison, my Aiyima A07 is silent at max volume and it is only RCA.

Anyone else have this problem?

Thanks

Is that happening with no source connected? Or only with inputs to the XLR/RCA.

If only when inputs are connected then the hissing is coming from upstream, not from the amp. Most likely (given it doesn't happen with your A07) route would be a ground loop. Perhaps with the system fed from a PC.

Thanks for quick response!
Have not tried to replace an op amp before. But there's a first time for everything. .

Replacing the op amp almost certainly wont help. You need to find the source of the noise.

 

[SMen]

Just got this amp. I get hissing on either XLR or RCA. The hiss is very loud when volume is turned up.
In comparison, my Aiyima A07 is silent at max volume and it is only RCA.

Anyone else have this problem?

Thanks

I have both of these ... no hiss on either RCA or XLR ... I used the BRZ with volume on max, using external pre-amp to handle volume.

 

[yo!]

Just got this amp. I get hissing on either XLR or RCA. The hiss is very loud when volume is turned up.
In comparison, my Aiyima A07 is silent at max volume and it is only RCA.

Anyone else have this problem?

Thanks

If some hiss is clearly audible in more then 30 cm distance from the speakers (vol max), then there's something fishy with the amp itself i guess, as long the chain before doesn't pick up any interference or grounding hum. Quick test with a portable device made?

 

[antcollinet]

If some hiss is clearly audible in more then 30 cm distance from the speakers (vol max), then there's something fishy with the amp itself i guess, as long the chain before doesn't pick up any interference or grounding hum. Quick test with a portable device made?

No need for portable device. Just disconnect any device (ideally also short the input) and crank the volume. If the amp hisses it will hiss with or without an input.

 

[yo!]

If you short the input, yes.

 

[Choit]

Is that happening with no source connected? Or only with inputs to the XLR/RCA.

If only when inputs are connected then the hissing is coming from upstream, not from the amp. Most likely (given it doesn't happen with your A07) route would be a ground loop. Perhaps with the system fed from a PC.



Replacing the op amp almost certainly wont help. You need to find the source of the noise.

When there is no source connected, hiss is minimal. Hiss is loud when connected to source via XLR or RCA
My setup....I connect a fiio bta30 pro dac into an active analog crossover and then into the BRZ. Its the same setup with the A07 and I even tried the Fx Audio L07.
A07 is silent. L07 has minimal hiss. BRZ has loud hiss.
Currently, to minimize hiss, I only put the BRZ potentiometer to 12 o'clock, and increase volume in the fiio and crossover.

 

[antcollinet]

OK - most likely (no certainty without being able to locally diagnose)

The fact that you get the noise only with a source connected means the noise is coming in from upstream, and is not internal to the amp. That it happens with both rca and xlr suggests it is not getting in on the connection between the crossover and the amp (else it would be much lower on the XLR). So it is upstream of that.

The likely difference between the A70 and the BRZ is the BRZ has a ground connection. That means if there is common mode noise from somewhere in the chain, it has a path to ground through the interconnect to the BRZ and from there to ground. This is not the case with the A70

What is the analogue crossover? Does it have a ground pin (I suspect not). The Dac does not. What is feeding the DAC? (state all if more than one) Is that (are they) grounded? What is the connection between that (those) source and DAC?

Two interesting experiment to try.
Disconnect DAC from crossover input - still noise?
Reconnect DAC to crossover, then disconnect all other devices from the DAC.