Aiyima A20 Mono - New Comer

[Sonyman]

5:48 amp go in standby mode .

 

[Sonyman]

A20 Mono's auto-standby circuit fails in a fully balanced XLR system using a miniDSP Flex HTX and Hypex Nilai 500. It proves beyond doubt that your 6 mV standby threshold circuit suffers from severe isolation issues and is completely broken.

 

[Klaasdj]

Not at all.

I've swapped it out for a pair of e3 A7 monos as the darn things kept switching off while the wife and i watched TV ( volume kept low cos the kid is asleep ).

Highly annoying.

A 12V trigger won't work to keep it awake as well - it turns it on but the low level auto-shut off still goes into effect after 20 minutes. A fundamental design flaw if you ask me.

The A20 MONO was originally designed with a standby detection threshold of 6 mV, which is already a very low level.

Based on user feedback, we will further optimize the detection threshold to 1 mV to better accommodate extremely low-volume listening scenarios, such as quiet passages in music or late-night listening.

At the same time, the threshold cannot simply be lowered indefinitely. The noise floor of some older tube preamps may exceed 500 μV, which could potentially be detected as an audio signal and prevent the A20 MONO from entering standby mode.

We believe that 1 mV provides a better balance between reliable standby operation and sensitivity to extremely low-level audio signals.

Thank you all for your valuable feedback and suggestions!

AIYIMA company

After reading the above information about probably the wrong threshold (6mV instead of 1mV) with respect to the automatic standby i feel more or less left in the cold.
This afternoon I contacting Amazon.nl where I bought my 2 x A20 Mono Blocks and we both came to the conclusion that the early version of the A20 Mono blocks are having this flaw and no solution from AIYIMA is to be expected on the already sold models.
So on advice of Amazon.nl I just returned both my A20 Mono blocks, despite my earlier decision.
In all honesty, I like the form factor and the sound, but the automatic standby is too much frustrating, for me that is,

 

[Sonyman]

The A20 MONO was originally designed with a standby detection threshold of 6 mV, which is already a very low level.

Based on user feedback, we will further optimize the detection threshold to 1 mV to better accommodate extremely low-volume listening scenarios, such as quiet passages in music or late-night listening.

At the same time, the threshold cannot simply be lowered indefinitely. The noise floor of some older tube preamps may exceed 500 μV, which could potentially be detected as an audio signal and prevent the A20 MONO from entering standby mode.

We believe that 1 mV provides a better balance between reliable standby operation and sensitivity to extremely low-level audio signals.

Thank you all for your valuable feedback and suggestions!

AIYIMA company

After reading the above information about probably the wrong threshold (6mV instead of 1mV) with respect to the automatic standby i feel more or less left in the cold.
This afternoon I contacting Amazon.nl where I bought my 2 x A20 Mono Blocks and we both came to the conclusion that the early version of the A20 Mono blocks are having this flaw and no solution from AIYIMA is to be expected on the already sold models.
So on advice of Amazon.nl I just returned both my A20 Mono blocks, despite my earlier decision.
In all honesty, I like the form factor and the sound, but the automatic standby is too much frustrating, for me that is,

Unfortunately, I ordered from AliExpress, but they are being difficult and claim they don't see the problem.

 

[Mark185]

Unfortunately, I ordered from AliExpress, but they are being difficult and claim they don't see the problem.

Unfortunately, that is typical for AliExpress. I won't buy electronics like this amplifier from them any more because of a similar experience. You may want to try contacting Aiyima customer support directly through their web site. If they are a good company, they should offer to swap out your A20 Mono for one with the revised threshold.

 

[Sonyman]

Unfortunately, that is typical for AliExpress. I won't buy electronics like this amplifier from them any more because of a similar experience. You may want to try contacting Aiyima customer support directly through their web site. If they are a good company, they should offer to swap out your A20 Mono for one with the revised threshold.

I hope they will. The amp sounds good when playing loud and design is

 

[Klaasdj]

Unfortunately, I ordered from AliExpress, but they are being difficult and claim they don't see the problem.

Maybe try contacting AIYIMA directly. Their email is [email protected] as far as I know. Just give it a try.

 

[Shadow Michael]

I had a connection problem with mine a while back. Messaged AIYIMA and they helped sort it out pretty quickly. Can’t really complain about the support.

 

[A Posteriori]

The A20 MONO was originally designed with a standby detection threshold of 6 mV, which is already a very low level.

Based on user feedback, we will further optimize the detection threshold to 1 mV to better accommodate extremely low-volume listening scenarios, such as quiet passages in music or late-night listening.

At the same time, the threshold cannot simply be lowered indefinitely. The noise floor of some older tube preamps may exceed 500 μV, which could potentially be detected as an audio signal and prevent the A20 MONO from entering standby mode.

We believe that 1 mV provides a better balance between reliable standby operation and sensitivity to extremely low-level audio signals.

Thank you all for your valuable feedback and suggestions!

How can we know whether the unit we are purchasing has the new 1 mV adjustment, rather than the older 6 mV configuration?

Will your distributors and resellers be informed about this change so they can update their product listings accordingly? Or, at the very least, will they be able to confirm which version they are selling if a customer asks them?

 

[eyecent]

View attachment 546029
View attachment 546030

AIYIMA, I have taken a close look at your products and have been very impressed by your technical capabilities.

Could you please let me know whether the A20 MONO uses a PBTL (Parallel BTL) topology?

 

[Sonyman]

Maybe try contacting AIYIMA directly. Their email is [email protected] as far as I know. Just give it a try.

I did . They will send me a new unit . The shipping take long time

 

[Klaasdj]

I did . They will send me a new unit . The shipping take long time

Wow, that's good news. So AIYIMA acknolidges that they designed it wrong. Please let us know what the result of the new unit is.