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Aiyima A04 TPA 3251 measurements, and maybe more
Aiyima A04 TPA 3251 measurements, and maybe more
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Old 16th October 2020, 04:50 PM   #41
Rallyfinnen is offline Rallyfinnen  Sweden
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Join Date: Jan 2017
I think adding 10mF should be enough to notice an improvement, but I can't say I did. Maybe I could wire up a multiplier myself to test..
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Old 18th October 2020, 04:05 AM   #42
gabanyayaya is offline gabanyayaya  Malaysia
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Join Date: Aug 2008
Quote:
Originally Posted by Audientid14 View Post
I use a capacitance multiplier from Allo. Its the same as having 1000000 uF .
Everything in the sound becomes slightly better with the capacitance multiplier, especially in the bass.

It only costs 17 dollars from Allo as stand alone. I can recomend it.

Iˋm using a mean well 24 v 6,3 A switch mode supply.
Audientid14

Did you adjust the Allo CM trimmer to suit Aiyima voltage requirement ?
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Old 18th October 2020, 06:45 AM   #43
Audientid14 is offline Audientid14
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Default from factory is - 0,5 V , meaning the 24 volt that comes in gets 23,5 volt out.

I have , with the trim pot, adjusted the drop out to -1 Volt. The 24 volt that goes in to the Allo card becomes 23 volt out to the amplifier. The card can take 30 volt in though, and that would be optimal I think.
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Old 19th October 2020, 12:53 AM   #44
ttan98 is online now ttan98  Australia
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Join Date: Apr 2006
Location: Melb
Hi,
I own a Tilear TPA3251 version, it states(from the seller site) it can handle up to 32Vdc, I tired and there didn't seem to be any problem. I notice some of you use 24Vdc. My question:
a. Why you use 24Vdc instead of 32Vdc?
b. 32Vdc would give greater output power?
c. anyone tried the sound reproduction between using 24Vdc and 32Vdc?
Thanks.
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Old 19th October 2020, 06:21 AM   #45
Audientid14 is offline Audientid14
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Join Date: Sep 2020
Theres no special reason for me using a 24 volt power supply. I have this supply left från my tpa3116 amplifiers.

Im sure that the sound probably gets better with 32 v or 30 volt with the Aiyima 3251. But I havent tested it, yet.
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Old 19th October 2020, 07:43 AM   #46
daniboun is offline daniboun  France
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Join Date: Nov 2019
Location: Lyon (France)
Quote:
Originally Posted by ttan98 View Post
Hi,
I own a Tilear TPA3251 version, it states(from the seller site) it can handle up to 32Vdc, I tired and there didn't seem to be any problem. I notice some of you use 24Vdc. My question:
a. Why you use 24Vdc instead of 32Vdc?
b. 32Vdc would give greater output power?
c. anyone tried the sound reproduction between using 24Vdc and 32Vdc?
Thanks.
Iam driving my Tpa 3251 Tilear 2.1 with a 35v / 7a PSU without any Issues. No overheat as well
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Old 19th October 2020, 08:59 AM   #47
joensd is offline joensd  Germany
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Join Date: Dec 2001
Location: Germany
Quote:
Originally Posted by ttan98 View Post
Hi,
I own a Tilear TPA3251 version, it states(from the seller site) it can handle up to 32Vdc, I tired and there didn't seem to be any problem. I notice some of you use 24Vdc. My question:
a. Why you use 24Vdc instead of 32Vdc?
b. 32Vdc would give greater output power?
c. anyone tried the sound reproduction between using 24Vdc and 32Vdc?
Thanks.
A good reason for 32V would be if you have 8Ohm speakers and want some "reserve" for power peaks or similar.

24V/8Ohms according to datasheet is roughly only 35W (THD 0.1%),
32V/8Ohms according to datasheet is ~ 62.5W (THD 0.1%).
similarly: 24V/4Ohms~65W; 32V/4Ohms~115W.

Iīm using 32V and all is fine.
24V-PSUīs are more common and usually cheaper so thatīs what people get.
But donīt forget all the 36V-PSUīs that can be adjusted down to 32V.

All that said the limitation in this amp towards higher power than 2x50W is most probably the tiny heatsink. (assuming all thermal connections are done 100%, otherwise you would experience a thermal shutdown long before;
the A04īs are OK but rely on thermal paste between chip and a little block of metal, more thermal paste and then the final little heatsink).
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Old 19th October 2020, 09:02 AM   #48
joensd is offline joensd  Germany
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Join Date: Dec 2001
Location: Germany
Quote:
Originally Posted by daniboun View Post
Iam driving my Tpa 3251 Tilear 2.1 with a 35v / 7a PSU without any Issues. No overheat as well
Most A04īs as far as I know have 35V caps so I wouldnīt recommend a 35V-PSU unless you change the caps before (yes, you are probably aware of that bro ;-))
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Old 19th October 2020, 09:20 AM   #49
daniboun is offline daniboun  France
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Join Date: Nov 2019
Location: Lyon (France)
Quote:
Most A04īs as far as I know have 35V caps so I wouldnīt recommend a 35V-PSU unless you change the caps before (yes, you are probably aware of that bro ;-))
Absolutely aware ) But I take the risk )
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Old 23rd October 2020, 07:30 AM   #50
Audientid14 is offline Audientid14
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Join Date: Sep 2020
Theres now been two comparisons between a Rotel ra1592 amplifier, a HYPEX nc400 and an Aiyima a04 in two high end setups.

The Aiyima with opa2604 was found sounding slightly better than Rotel. No difference between an original Aiyima and HYPEX nc400.
Better bass and a clearer sound compared to Rotel ra1592.

faktiskt.io • Visa trad - Ljudmassig utvardering av tpa3251 Aiyima A04 - klass D

Last edited by Audientid14; 23rd October 2020 at 07:48 AM.
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