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Aiyima A08 TPA3255 Amplifier - Owner review and initial impressions

Xulonn

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Note: There is a long 64 page ASR thread titled "Which TPA3255 amp do you recommend?" [LINK] that was started I September, 2019. Although I have not tried other TPA3255 amplifiers, this is the one that I now own and recommend highly based on its excellent performance and features that are perfect for my requirements.
=================================================================================​

AIYIMA with SMPS.jpg

My previous desktop amp was an I.AM.D. v200, based on the TI TAS5614LA chip, which is rated for [email protected]Ω/[email protected]Ω. It is one of the tiny modern amplifiers with a coarse LED display (which was losing pixels), and an external brick power supply. It also had a tiny remote control which is not useful when you are sitting at a desk with your hand inches away from the amp. So that makes the lack of a remote for the Aiyima A08 is not an issue for me, although the lack of a remote would make it less convenient for living room systems where you sit out of reach of your amplifier. The I.AM.D v200 was so small with such a tiny volume knob that I could barely grip it, and my fingers hit the desktop when turning it.

Sound-wise, the I.AM.D v200 was o.k., so I made the "upgrade" to the Aiyima A08 based mostly on the feature set. However the I.AM.D. v200 never reached the "so loud it hurt my ears" like the Aiyima A08 can do - in spite of similar power output ratings (which have not been verified by independent testing).

I purchased my Aiyima A08 from Amazon for $170, although it costs less at some AliExpress stores in China. The A08 weighs 3.31 pounds (1.49 kg), so with the internal power supply, it is quite a bit heavier than the typical mini-amps that use the TPA3255 or similar amplifier chips and external power bricks. Rather then looking and feeling like a miniaturized traditional SS amplifier, it is more like a standard size traditional SS amp with the left and right sides cut off. Since it is my desktop/computer amplifier, I wanted to put it under my HP 24" monitor, but the Aiyima was a little too tall. So I made a 1/2" riser to lift the monitor up a bit. I am right-handed, and the larger volume knob is conveniently located right above the top right corner of my keyboard, and only a couple of inches from my trackball (which I prefer for general use rather than a mouse).

Because I am aware that properly engineered and manufactured low distortion amplifiers should sound the same when used within their limits, I did not expect the Aiyima to be able to drive my Q Acoustics 3010 loudspeakers to such deafening levels without audible distortion. From an ASR post by @Tangband "On the Swedish forum faktiskt.io they have checked the voltage of that amplifiers power supply and its 36 V 9.6 A . That gives about 2*150 watt at 4 ohms, 1 % distortion)". Based on the below graph fro the TI spec sheets, the Aiyima A08 should produce a little less output power than the Swedish forum post stated, and about the same output as my little I.AM.D v200, which is [email protected]Ω/[email protected]Ω. I will never know for sure, because I expect @amirm to get an Aiyima A08 to evaluate, but the old I.AM,D v200 will very likely never be tested at ASR.

I have seen posts about the current rating of brick power supplies limiting the output of chip amps, and I might start another thread to ask the experts and learn more about the relationship between power supply voltage, current, and how they interact with amplifier output. Without searching for info, it seems to me that the 36v/9.6a rating of the Aiyima A08 internal power supply is high enough to product a robust output. It is also the max that I have seen recommended to avoid stressing and or overheating an amplifier when it is used to listen at high volume with low efficiency loudspeakers.
TPA3255 Input Volts vs Watts Output.jpg

Bottom line:
- I like my Aiyima A08 amplifier and highly recommend it as a desktop amplifier.
- It has no tweeter hiss that I can hear with volume at max
- The Aiyima A08 can drive my Q Acoustics loudspeakers to deafening levels with no audible distortion
- Bluetooth input is not useful to me, but may be for others
- USB + RCA are the "hardware" inputs, but I don't use Coaxial or optical on my desktop
- Since I only use the USB input, having the USB/RCA source switch on the back or the amplifier is not an issue for me.
- The Aiyima A08 would have a broader potential user market if it had a line-level subwoofer output.
--------------------------------------------
Below are the Aiyima specs.

Basic Parameters:
Amplifier IC: TPA3255
Output power: 315W/4Ω 185W/8Ω
Bluetooth version: Qualcomm QCC3034 5.0 chip
Decoder IC:pCM5102 decoding
Bluetooth support: CRS8675-SBC/AAC/APTX/APTX-LL/APTX-HD 16-24Bit 44.1Hz-48Khz
USB decoding: 16Bit-48Khz
Frequency response: 20Hz-20Khz
Input power: AC100-240 50/Hz
Operational amplifier: NE5532
Signal to noise ratio: (SNR)> 111dB
Impedance: 4-8Ω
Quiescent current: 60mA
Work efficiency:.>90%
Output Power:
315W/4Ω, distortion 10%
185W/8Ω, distortion 10%
260W/4Ω, distortion 1%
150W/8Ω, distortion 1%
Product size: 101*93*184mm
 
Last edited:

phoenixdogfan

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So happy to see you back in action. :D

I recently bought the Aiyima A07 to drive a Kef HTC 3005 SE, I recently purchase for my small bedroom sized home theater. And yes. Aiyima, as far as I can tell, does indeed deliver the goods. I was just looking for a way to add a center channel to what was my Kef LS 50 Meta based 4.1 home theater, and a late model 2009 vintage Kef home theater center and the Aiyima provided me with a way to do something that seems to fit right in with my pricier gear for around $200 for speaker, stand and amp together.
 

Tangband

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Sep 3, 2019
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I can recommend the LM4562 instead of 5532 , the sound ( and measurements ) gets a bit better . Audiophonics is a good dealer .
 

Toku

Major Contributor
Joined
Apr 4, 2018
Messages
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Location
Japan
Note: There is a long 64 page ASR thread titled "Which TPA3255 amp do you recommend?" [LINK] that was started I September, 2019. Although I have not tried other TPA3255 amplifiers, this is the one that I now own and recommend highly based on its excellent performance and features that are perfect for my requirements.
=================================================================================​

View attachment 214342
My previous desktop amp was an I.AM.D. v200, based on the TI TAS5614LA chip, which is rated for [email protected]Ω/[email protected]Ω. It is one of the tiny modern amplifiers with a coarse LED display (which was losing pixels), and an external brick power supply. It also had a tiny remote control which is not useful when you are sitting at a desk with your hand inches away from the amp. So that makes the lack of a remote for the Aiyima A08 is not an issue for me, although the lack of a remote would make it less convenient for living room systems where you sit out of reach of your amplifier. The I.AM.D v200 was so small with such a tiny volume knob that I could barely grip it, and my fingers hit the desktop when turning it.

Sound-wise, the I.AM.D v200 was o.k., so I made the "upgrade" to the Aiyima A08 based mostly on the feature set. However the I.AM.D. v200 never reached the "so loud it hurt my ears" like the Aiyima A08 can do - in spite of similar power output ratings (which have not been verified by independent testing).

I purchased my Aiyima A08 from Amazon for $170, although it costs less at some AliExpress stores in China. The A08 weighs 3.31 pounds (1.49 kg), so with the internal power supply, it is quite a bit heavier than the typical mini-amps that use the TPA3255 or similar amplifier chips and external power bricks. Rather then looking and feeling like a miniaturized traditional SS amplifier, it is more like a standard size traditional SS amp with the left and right sides cut off. Since it is my desktop/computer amplifier, I wanted to put it under my HP 24" monitor, but the Aiyima was a little too tall. So I made a 1/2" riser to lift the monitor up a bit. I am right-handed, and the larger volume knob is conveniently located right above the top right corner of my keyboard, and only a couple of inches from my trackball (which I prefer for general use rather than a mouse).

Because I am aware that properly engineered and manufactured low distortion amplifiers should sound the same when used within their limits, I did not expect the Aiyima to be able to drive my Q Acoustics 3010 loudspeakers to such deafening levels without audible distortion. From an ASR post by @Tangband "On the Swedish forum faktiskt.io they have checked the voltage of that amplifiers power supply and its 36 V 9.6 A . That gives about 2*150 watt at 4 ohms, 1 % distortion)". Based on the below graph fro the TI spec sheets, the Aiyima A08 should produce a little less output power than the Swedish forum post stated, and about the same output as my little I.AM.D v200, which is [email protected]Ω/[email protected]Ω. I will never know for sure, because I expect @amirm to get an Aiyima A08 to evaluate, but the old I.AM,D v200 will very likely never be tested at ASR.

I have seen posts about the current rating of brick power supplies limiting the output of chip amps, and I might start another thread to ask the experts and learn more about the relationship between power supply voltage, current, and how they interact with amplifier output. Without searching for info, it seems to me that the 36v/9.6a rating of the Aiyima A08 internal power supply is high enough to product a robust output. It is also the max that I have seen recommended to avoid stressing and or overheating an amplifier when it is used to listen at high volume with low efficiency loudspeakers.

Bottom line:
- I like my Aiyima A08 amplifier and highly recommend it as a desktop amplifier.
- It has no tweeter hiss that I can hear with volume at max
- The Aiyima A08 can drive my Q Acoustics loudspeakers to deafening levels with no audible distortion
- Bluetooth input is not useful to me, but may be for others
- USB + RCA are the "hardware" inputs, but I don't use Coaxial or optical on my desktop
- Since I only use the USB input, having the USB/RCA source switch on the back or the amplifier is not an issue for me.
- The Aiyima A08 would have a broader potential user market if it had a line-level subwoofer output.
--------------------------------------------
Below are the Aiyima specs.
What I am most concerned about with such products is the pop noise that occurs when the power switch is turned on and off. Do you actually use it and get pop noise? Is it completely silent? Please give me advice.
 
OP
Xulonn

Xulonn

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What I am most concerned about with such products is the pop noise that occurs when the power switch is turned on and off. Do you actually use it and get pop noise? Is it completely silent? Please give me advice.
My A08 is dead silent with no on/off noise. Just now, with no music playing, I cranked the volume control to max and turned the amplifier off and on a couple of times - zero noise.

The only quirk I ran into is that the USB connection, which is seen by my Windows 11 Intel NUC8i7 PC as "QCC3034", disables my PC's internal microphone. When I plug the USB cable into my PC, the A08 not only takes over the PC audio output - as it should - but it also connects as a phantom default audio input device (microphone), thereby disabling the PC's internal microphone. I discovered this bug when trying to call my USA bank from Panamá with Skype. All I had to do to fix it was to go into Windows devices settings for sound, disable the QCC3034 microphone, and re-set the internal microphone (Microsoft Array) as the default.

I am really happy with this amplifier and recommend it highly.

The only competition I see for it anywhere is the Audiophonics TPA S100, which is another TPA3255 amplifier with the same minimalist feature set as the Aiyima A08. However, the !50/180 euro Audiophonics amp (image below) has the amplifier board and the internal power supply board side-by-side, rather than stacked, so the form-factor is low-profile rectangle rather than a taller square profile like the A08. The Audiophonics amp also has a front panel LED display. Simce @amirm apparently told Aiyima that he was not interested measuring/reviewing the Aiyima 08 after measuring the A07, I wish he could measure and review the Audiophonics TPA-S100. It is the only basic TPA3255 amplifier with a traditional low-profile form-factor and internal power supply that I am aware of. Although I prefer the narrow Aiyima A08 for my desktop, I could easily live with the Audiophonics TPA-S100 as a main amplifier for a system in a small room that used small speakers and a powered subwoofer. It's small, enegy-efficient, quiet, powerful - and no external power brick!

Audiophonics TPA S100 - TPA3255 Amplifier.jpg
 
Last edited:
Joined
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My A08 is dead silent with no on/off noise. Just now, with no music playing, I cranked the volume control to max and turned the amplifier off and on a couple of times - zero noise.

The only quirk I ran into is that the USB connection, which is seen by my Windows 11 Intel NUC8i7 PC as "QCC3034", disables my PC's internal microphone. When I plug the USB cable into my PC, the A08 not only takes over the PC audio output - as it should - but it also connects as a phantom default audio input device (microphone), thereby disabling the PC's internal microphone. I discovered this bug when trying to call my USA bank from Panamá with Skype. All I had to do to fix it was to go into Windows devices settings for sound, disable the QCC3034 microphone, and re-set the internal microphone (Microsoft Array) as the default.

I am really happy with this amplifier and recommend it highly.

The only competition I see for it anywhere is the Audiophonics TPA S100, which is another TPA3255 amplifier with the same minimalist feature set as the Aiyima A08. However, the !50/180 euro Audiophonics amp (image below) has the amplifier board and the internal power supply board side-by-side, rather than stacked, so the form-factor is low-profile rectangle rather than a taller square profile like the A08. The Audiophonics amp also has a front panel LED display. Simce @amirm apparently told Aiyima that he was not interested measuring/reviewing the Aiyima 08 after measuring the A07, I wish he could measure and review the Audiophonics TPA-S100. It is the only basic TPA3255 amplifier with a traditional low-profile form-factor and internal power supply that I am aware of. Although I prefer the narrow Aiyima A08 for my desktop, I could easily live with the Audiophonics TPA-S100 as a main amplifier for a system in a small room that used small speakers and a powered subwoofer. It's small, enegy-efficient, quiet, powerful - and no external power brick!

Hi, are you still liking the amp? I'm considering pulling the trigger on one. How is the bluetooth range? I'd use it with an android phone over bluetooth.
 
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