Aiyima A07 Max - Aiyima's new TPA3255 amplifier with mono/stereo output

[damarfi]

Under this offer on Aliexpress are two three nice reviews..

https://a.aliexpress.com/_mPYtbiC

 

[staticV3]

Thanks. So some common sense. What is the advantage to having more power really? I curently have a Emotiva A2M powering em. I doubt the A07 Max mono blocks will sound better, but I am too curious, and I have other uses for them if not on this setup.

More volume potential. That's it.
If your current Amp gets loud enough with no obvious distortion or hiss, then there's little to be gained beyond that.

 

[space_duck]

More volume potential. That's it.
If your current Amp gets loud enough with no obvious distortion or hiss, then there's little to be gained beyond that.

Thanks. So some common sense. What is the advantage to having more power really? I curently have a Emotiva A2M powering em. I doubt the A07 Max mono blocks will sound better, but I am too curious, and I have other uses for them if not on this setup.

For me it's peace of mind. I want to be sure that my amp won't overload/clip and damage my speakers during very loud moments like the ship battles in Master & Commander or the cannons in Telarc's 1812. During normal listening I doubt I use more than 2-3WPC.

 

[ninetylol]

For me it's peace of mind. I want to be sure that my amp won't overload/clip and damage my speakers during very loud moments like the ship battles in Master & Commander or the cannons in Telarc's 1812. During normal listening I doubt I use more than 2-3WPC.

You have a monoblock setup to not damage your speakers? i would actually think the opposite, if you dont have a failsafe and both monoblocks put out max level, it could damage your speaker. Or what do you mean?

 

[Eron]

You have a monoblock setup to not damage your speakers? i would actually think the opposite, if you dont have a failsafe and both monoblocks put out max level, it could damage your speaker. Or what do you mean?

Yikes.. Kinda regret the purchase already. Oh well at least I can assess and worst case someone will buy em off me.

 

[ninetylol]

Yikes.. Kinda regret the purchase already. Oh well at least I can assess and worst case someone will buy em off me.

Well you dont have to turn them up to maximum level, or you can use a preamp. I dont think you can do anything wrong at that price.

 

[Eron]

Well you dont have to turn them up to maximum level, or you can use a preamp. I dont think you can do anything wrong at that price.

Ah yeah I guess eh. Haven't really done a lot of review searching on Op-Amps... Generally use the out's on my Onkyo RZ-830..

 

[Fleuch]

1. Mono Mode

When <Mono> is selected, is the right hand channel switched in parallel with the left hand channel to form a true PBTL configuration, as in the schematic, and the speaker is connected between the "live" output of each channel?

The "A07MAX Mono Channel Correct Connection Method" on the Aiyima web site suggests both channels are in use but it is difficult to visualise how a simple slide switch (or toggle switch in the Fosi ZA3) can make the necessary changes in circuit configuration.

Are there any measurements to show both channels contribute to the output?

2. Output Power

It is important to look at the published figures for power output:

From the Aiyima web page:

Stereo Max Output Power(switch stereo mode)：300Wx2 / 4Ω（48V/12A)

Mono Max Output Power(switch mono mode)：600W/ 2Ω（48V/12A）

(R+ connect to speaker +, L+ connect to speaker -)

The output power ratings are quoted using a 48V/12A power supply (not available from Aiyima); multiplying volts by amps only gives 576W so these figures must be questionable and an instance of "missing watts". Further it would not be wise to push the amplifier to these maximum levels with 50V caps!!

Also from the Aiyima website:

Product Name: 32V 5A power adapter / charger / switching power supply
Input parameters: AC100-240V 50/60Hz
Output voltage: DC32V (plus or minus 5%)
Output current: 5A
Rated power: 160W

and

Product Name: 36V 6A power adapter / switching power supply
Input parameters: AC100-240V 50/60Hz
Output voltage: DC36V (plus or minus 5%)
Output current: 6A
Rated power: 216W

The equivalent figures are not available for the 48V/5A power bricks. Note the rated power in each case is obtained by mutiplying volts by amps. Based on the principle that it is impossible to get more out than is put in, it is reasonable to suggest the published figures for power output for the A07Max are, at best, deceptive.

 

[gasolin75]

Thanks. So some common sense. What is the advantage to having more power really? I curently have a Emotiva A2M powering em. I doubt the A07 Max mono blocks will sound better, but I am too curious, and I have other uses for them if not on this setup.

More power for the bass, dynamic peaks and less distortion,cleaner sound

 

[gasolin75]

Under this offer on Aliexpress are two three nice reviews..

https://a.aliexpress.com/_mPYtbiC

Incredible amplifier! Upon acquiring it, I promptly replaced the OP amp with an LM4562NA. Believe me, the excessive ringing at high volumes disappeared the moment I made this switch with the LM4562NA OPAMP. If you undertake this modification, you won't be disappointed.

less than 8 euros + shipping if needed, for 2 of the mentioned OP amps LM4562NA, if i buy one i will get the OP amps

 

[gasolin75]

You have a monoblock setup to not damage your speakers? i would actually think the opposite, if you dont have a failsafe and both monoblocks put out max level, it could damage your speaker. Or what do you mean?

I don't think so

limit it with the dac if you have a good one (or your pc)

 

[gasolin75]

1. Mono Mode

When <Mono> is selected, is the right hand channel switched in parallel with the left hand channel to form a true PBTL configuration, as in the schematic, and the speaker is connected between the "live" output of each channel?

View attachment 325730
The "A07MAX Mono Channel Correct Connection Method" on the Aiyima web site suggests both channels are in use but it is difficult to visualise how a simple slide switch (or toggle switch in the Fosi ZA3) can make the necessary changes in circuit configuration.

Are there any measurements to show both channels contribute to the output?

2. Output Power

It is important to look at the published figures for power output:

From the Aiyima web page:

Stereo Max Output Power(switch stereo mode)：300Wx2 / 4Ω（48V/12A)

Mono Max Output Power(switch mono mode)：600W/ 2Ω（48V/12A）

(R+ connect to speaker +, L+ connect to speaker -)

The output power ratings are quoted using a 48V/12A power supply (not available from Aiyima); multiplying volts by amps only gives 576W so these figures must be questionable and an instance of "missing watts". Further it would not be wise to push the amplifier to these maximum levels with 50V caps!!

Also from the Aiyima website:

Product Name: 32V 5A power adapter / charger / switching power supply
Input parameters: AC100-240V 50/60Hz
Output voltage: DC32V (plus or minus 5%)
Output current: 5A
Rated power: 160W

and

Product Name: 36V 6A power adapter / switching power supply
Input parameters: AC100-240V 50/60Hz
Output voltage: DC36V (plus or minus 5%)
Output current: 6A
Rated power: 216W

The equivalent figures are not available for the 48V/5A power bricks. Note the rated power in each case is obtained by mutiplying volts by amps. Based on the principle that it is impossible to get more out than is put in, it is reasonable to suggest the published figures for power output for the A07Max are, at best, deceptive.

I didn't thought the power supply was that power full (12a), must be a low quality psu for the price on aliexpress for both the amp and power supply, usually shuch power 48v 12a cost s as much as the amp, 60 euros

The fosi audio v3 only comes with a 48v 5a power supply as the highest, why not buy that amp use it in stereo and the mentioned LM4562NA OP amps (in a review in #321) it won't put out as much power as the 07 max

 

[Guddu]

@guddu I use DAC Topping DX3 Pro.Now problematic take 36 V PSU, take new one from Ali its not cheap,

DX3 pro is good enough for input. Don’t know your location but if Amazon has return policy there then it’s worth trying a 36v 6a psu. If you don’t see desired outcome then you can it back at least.

 

[Toku]

1. Mono Mode

When <Mono> is selected, is the right hand channel switched in parallel with the left hand channel to form a true PBTL configuration, as in the schematic, and the speaker is connected between the "live" output of each channel?

View attachment 325730
The "A07MAX Mono Channel Correct Connection Method" on the Aiyima web site suggests both channels are in use but it is difficult to visualise how a simple slide switch (or toggle switch in the Fosi ZA3) can make the necessary changes in circuit configuration.

Are there any measurements to show both channels contribute to the output?

2. Output Power

It is important to look at the published figures for power output:

From the Aiyima web page:

Stereo Max Output Power(switch stereo mode)：300Wx2 / 4Ω（48V/12A)

Mono Max Output Power(switch mono mode)：600W/ 2Ω（48V/12A）

(R+ connect to speaker +, L+ connect to speaker -)

The output power ratings are quoted using a 48V/12A power supply (not available from Aiyima); multiplying volts by amps only gives 576W so these figures must be questionable and an instance of "missing watts". Further it would not be wise to push the amplifier to these maximum levels with 50V caps!!

Also from the Aiyima website:

Product Name: 32V 5A power adapter / charger / switching power supply
Input parameters: AC100-240V 50/60Hz
Output voltage: DC32V (plus or minus 5%)
Output current: 5A
Rated power: 160W

and

Product Name: 36V 6A power adapter / switching power supply
Input parameters: AC100-240V 50/60Hz
Output voltage: DC36V (plus or minus 5%)
Output current: 6A
Rated power: 216W

The equivalent figures are not available for the 48V/5A power bricks. Note the rated power in each case is obtained by mutiplying volts by amps. Based on the principle that it is impossible to get more out than is put in, it is reasonable to suggest the published figures for power output for the A07Max are, at best, deceptive.

I think your point is completely correct.

I think the internal connection of AIYIMA A07 Max in monaural mode is probably different from the PBTL method listed in the TPA3255 datasheet.
If the A07 Max uses the same PBTL method as the data sheet, the speaker connection will never be as described in the manual.
If you use the PBTL method and connect the positive speaker terminals together, you will need a complicated switching circuit. Such switching is not possible with the two-circuit relay shown in the photo of the PC board.

In my imagination, the input signal on one side of the 2-ch BTL is inverted using the OP, and the 2-ch BTL is operated in reverse phase. As a result, the speaker will be connected between the positive output terminals and driven using both channels.

 

[vicenzo_del_paris]

I don't understand why Aiyima did not include a volume bypass switch to turn these little A07 max into composable small power amps
I am looking for a small mono power amp for my center speaker for my 3.2 setup.
Mains are driven by an hyper stereo ncore amp and subs are active.
This A07 MAX in mono mode will be perfect and very cheap. I just wish the volume plot could be deactivated.

Thinking about it. As the A07 max does not have a trigger in, it would not be convenient as a small monoblock.
I had a look at his cousin the Fosi Z3A, quite similar product, that has a trigger in.
I guess that setting the volume at safe max in mono mode would allow to use it as a pure small monoblock controller by trigger?
Btw, I do not understand why the fosi has put the 2 switches XLR/RCA and Stereo/mono on the front.
But a monobock, it could placed to be out touch and sight preventing access to front switches.

 

[delta76]

Under this offer on Aliexpress are two three nice reviews..

https://a.aliexpress.com/_mPYtbiC

user reviews are mostly useless... yes if you spot a lot of reliability issues in reviews it might be a warning sign, but I would take 5* reviews with a pinch of salt

 

[gasolin75]

I don't understand why Aiyima did not include a volume bypass switch to turn these little A07 max into composable small power amps
I am looking for a small mono power amp for my center speaker for my 3.2 setup.
Mains are driven by an hyper stereo ncore amp and subs are active.
This A07 MAX in mono mode will be perfect and very cheap. I just wish the volume plot could be deactivated.

Thinking about it. As the A07 max does not have a trigger in, it would not be convenient as a small monoblock.
I had a look at his cousin the Fosi Z3A, quite similar product, that has a trigger in.
I guess that setting the volume at safe max in mono mode would allow to use it as a pure small monoblock controller by trigger?
Btw, I do not understand why the fosi has put the 2 switches XLR/RCA and Stereo/mono on the front.
But a monobock, it could placed to be out touch and sight preventing access to front switches.



Don't know what the problem is, almost all power amp have a volume,gain knob so you can set it to match your speakers or prefered level,spl

SABAJ A20A 2022 BTL mono mode https://www.audiophonics.fr/en/hifi...bluetooth-50-2x170w-1x350w-4-ohm-p-17037.html

 

[vicenzo_del_paris]

Thinking about it. As the A07 max does not have a trigger in, it would not be convenient as a small monoblock.
I had a look at his cousin the Fosi Z3A, quite similar product, that has a trigger in.
I guess that setting the volume at safe max in mono mode would allow to use it as a pure small monoblock controller by trigger?
Btw, I do not understand why the fosi has put the 2 switches XLR/RCA and Stereo/mono on the front.
But a monobock, it could placed to be out touch and sight preventing access to front switches.



Don't know what the problem is, almost all power amp have a volume,gain knob so you can set it to match your speakers or prefered level,spl

SABAJ A20A 2022 BTL mono mode https://www.audiophonics.fr/en/hifi...bluetooth-50-2x170w-1x350w-4-ohm-p-17037.html

I am looking for a small plain mono power amp (monoblock) not an integrated amp.
The sabaj a20a is an integrated amp as it has volume control and multiple sources

 

[Joe Smith]

I am looking for a small plain mono power amp (monoblock) not an integrated amp.
The sabaj a20a is an integrated amp as it has volume control and multiple sources

I keep recommending that Fosi develop mono-blocks or a stereo product (straight amp, no V/C) to compete with the Hypex-based power amps. They seem like the most likely manufacturer to try that, we'll see... I continue to sit and wait, as I don't really need more power right now, but if the right product comes along I will re-jigger my setups to accommodate. I like the Schiit Vidar 2, but price point a bit high/runs warm; Buckeye U.S. made Hypex amps good price, but no front on/off switch and need XLR connections rather than RCA. Nothing's quite right right now, so I'm watching and waiting for developments... If Fosi can fix the speaker load dependency issue and release a true power amp, that will be a good thing...

 

[vicenzo_del_paris]

I keep recommending that Fosi develop mono-blocks or a stereo product (straight amp, no V/C) to compete with the Hypex-based power amps. They seem like the most likely manufacturer to try that, we'll see... I continue to sit and wait, as I don't really need more power right now, but if the right product comes along I will re-jigger my setups to accommodate. I like the Schiit Vidar 2, but price point a bit high/runs warm; Buckeye U.S. made Hypex amps good price, but no front on/off switch and need XLR connections rather than RCA. Nothing's quite right right now, so I'm watching and waiting for developments... If Fosi can fix the speaker load dependency issue and release a true power amp, that will be a good thing...

I might give a try with the fosi ZA3.
If not satisfactory, I will end up by using a audiophonics MPA-M250NC (a bit overkill for a central channel).