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Aiyima A07 Pro Amplifier Review
- Thread starter amirm
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Yes, the output power and dynamic power output will be a bit better with mono output than both channels being used at the same time.
grogi.giant
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It depends on your power supply and your speaker.
In majority of cases yes, single speaker gets more power than one out of the two. Not twice as much though.
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I recently purchased the new version of Aiyima A04. It is very similar to the A07 Pro with the exception of BT, and it uses the TPA3251 chip as the original A04.
It is nice to know that newer designs based on the TPA325X are all using the Sumida inductors (for class D amps). Anyway I proceeded to replace parts that I considered could be better:
The power Supply decoupling capacitor looks very weird. The Nichicon label does not look like the one I know, So I replaced that capacitor for a Nichicon UBY 3600uF 50V.
The output filter capacitors (Epcos MKT) were replaced by a 1uF Panasonic EWC Polypropilene capacitor and a 1nF Wima FKP 2.
I tried replacing the 4 coupling capacitors (after the opamps) but the holes are too small for Nichicon FG, KZ or Elna Silmic II. I'll see if I can find ones with thinner leads.
The 2 RCA coupling capacitors were upgraded to some big Nichicon UKZ.
The 4 opamps (the A04 does not have that 5th opamp used by the BT input) were replaced by 2 OPA1656 for the buffer and Tone control sections, and 2 OPA1612 for the differential inputs to chiptset. I soldered/assembled them myself, I noticed that those purchased from Ebay or Aliexpress seem "weirdly/suspiciously not authentic".
During amplifier reassembly, the thermal paste was replaced with a higher performance one.
I'll leave the amp running for 8 hours, but so far the upgrade worth it.
It is nice to know that newer designs based on the TPA325X are all using the Sumida inductors (for class D amps). Anyway I proceeded to replace parts that I considered could be better:
The power Supply decoupling capacitor looks very weird. The Nichicon label does not look like the one I know, So I replaced that capacitor for a Nichicon UBY 3600uF 50V.
The output filter capacitors (Epcos MKT) were replaced by a 1uF Panasonic EWC Polypropilene capacitor and a 1nF Wima FKP 2.
I tried replacing the 4 coupling capacitors (after the opamps) but the holes are too small for Nichicon FG, KZ or Elna Silmic II. I'll see if I can find ones with thinner leads.
The 2 RCA coupling capacitors were upgraded to some big Nichicon UKZ.
The 4 opamps (the A04 does not have that 5th opamp used by the BT input) were replaced by 2 OPA1656 for the buffer and Tone control sections, and 2 OPA1612 for the differential inputs to chiptset. I soldered/assembled them myself, I noticed that those purchased from Ebay or Aliexpress seem "weirdly/suspiciously not authentic".
During amplifier reassembly, the thermal paste was replaced with a higher performance one.
I'll leave the amp running for 8 hours, but so far the upgrade worth it.
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KaeliKoo
Active Member
Thanks for the pics - ordered this yesterday, will be here tomorrow. Getting some good reviews on upgraded A04...
Did you get yours? What are your thoughts?
KaeliKoo
Active Member
Seems to be okay, sounds very similar to new Aiyima A06 which I picked up. One use TP3251 and other TDA 9478. Was going to send it for measuring but thinking now I will return as its a higher price than similar and I prefer the smaller A06, which also has better knobs than A04. Also no midpoint indents for tone controls, which I really like to have. Was curious about this from the kickstarter run campaign. It definetely has longer case then any of my other Aiyima amps.
How can you tell that the upgrades have influence on the sound quality, beside personal subjective observation? Did you measure any change in distortion? What are your impressions about this upgrade?
Guddu
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New Aiyima 3255 Amplifier | A07 v2 ??
Friends, I have come across a new Aiyima amplifier soon to be available. TPA3255 based amplifier, probably upgrade to their A07 amplifier. Back panel looks simplified: - RCA input - AUX input/pre-out - better speaker terminals, looks bigger than usual ones used in similar amplifiers. Seems...
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First time i see it, thanks. Lets see how it compares to V3 and 07. I run two 07, great amps love it. Had several A B and tube, this is not less.New Aiyima 3255 Amplifier | A07 v2 ??
Friends, I have come across a new Aiyima amplifier soon to be available. TPA3255 based amplifier, probably upgrade to their A07 amplifier. Back panel looks simplified: - RCA input - AUX input/pre-out - better speaker terminals, looks bigger than usual ones used in similar amplifiers. Seems...
Hey guys. I just picked up the a07 pro along with a pair of Wharfedale Diamond 12.3. Amp came with the 36V 6A psu. I figured this amp at least should be able to drive these speakers (they recommend 30-150W amp), but if I turn up the audio up to even medium loudness the sound cuts off completely, and when I turn it down it comes back after a few seconds. Is this normal? It's not even enough volume for casual listening. Do I need a higher psu? or a more powerful amp alltogether? Also it sounds pretty flat, but I guess I need to let the speakers burn in for some time before I can make any judgment on the audio quality. Issues persist both on BT and analog in. I'm new to hifi so any help is much appeciated.
Sounds like a protection preventing something worse. It certainly isn't normal.
A normal amp would be able to play louder and louder, into clipping, forever.
Is the Diamond 12.3 known to suck a ungodly amount of current? That could lead to the amp going into protection.
Guddu
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It does not sound sound usual at all.
If I were you:
- Try using a different set of speakers if possible to rule out speakers causing anything problematic
- A different PSU
If both above does not give you any useful indication then something might be wrong with amplifier.
Diamond 12.3 are 8 Ohm 87.5db rated speakers, this amp should be able to light these out pretty loud without any issues.
grogi.giant
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No, it's broken. You can test one speaker at a time to make sure if there is not a rogue speaker...
But beyond that, don't try to debug the issue. Demand replacement of the amp, end of story.
grogi.giant
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No, those are regular, popular speakers ... They don't anything fancy to get sound out of them.
ASR has had questions similar to yours many times in the past. When using a Class D BTL amplifier, special attention must be paid to speaker wiring.
This is the first thing to check to find the cause.
Is there a speaker switcher etc. connected between the amplifier and the speaker?
Are any wires from other than the A07Max connected to the speaker terminals?
I have to laugh at those that cant simply appreciate things for what they are. always have to find fault in these new "toys" despite the fact that they will work for a large majority of people out there who think tiny bluetooth speakers are just fine.
my son blew the speakers out on my Samsung. he is new to music and got carried away I guess. I bought a cheap samsung soundbar/sub thing that worked but I had to make changes and for some reason I havnt been able to get it reconnected.
fast forward to now. I had a pair of old JBL ported bookshelf speakers. the woofers were dry rotted but since they came to me free from a close family member who passed , I decided to hit parts express and get some new drivers . did that and they sound great when powered by the A07 PRO I bought to run them . better than sound bar.
I was thinking about hooking up this A07 Pro to my JBL 590's towers that I run off my real amp but I dont think it would take the abuse.
But thats ok. its cheap. plays loud actually thru the bookshelves and my son wont blow up my expensive gear.
People are being silly to complain about a device that can do all this that the A07 Pro can do for under $100 and take up next to zero space.
my son blew the speakers out on my Samsung. he is new to music and got carried away I guess. I bought a cheap samsung soundbar/sub thing that worked but I had to make changes and for some reason I havnt been able to get it reconnected.
fast forward to now. I had a pair of old JBL ported bookshelf speakers. the woofers were dry rotted but since they came to me free from a close family member who passed , I decided to hit parts express and get some new drivers . did that and they sound great when powered by the A07 PRO I bought to run them . better than sound bar.
I was thinking about hooking up this A07 Pro to my JBL 590's towers that I run off my real amp but I dont think it would take the abuse.
But thats ok. its cheap. plays loud actually thru the bookshelves and my son wont blow up my expensive gear.
People are being silly to complain about a device that can do all this that the A07 Pro can do for under $100 and take up next to zero space.
CassilinRyan
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Today, i purchase a AIYIMA A07 Pro,The A07 Pro unit is working fine, but the 3.5 mm AUX output of the A07 Pro surprisingly can be controlled by the Volume knob (same as A08 Pro), Not as the case of my two A07 units.Anyone know if this is updated?
My AIYIMA A07 Pro, Bluetooth input, fixed output no Volume knob control, didn't try RCA inputs.
But @bluetooth input, 3.5mm AUX output is very quiet, maybe 0.3V RMS (not measured, by comparison).
Why Aiyima, why?
5th opamp is AUX 3.5mm output buffer and result is very low volume????
@AIYIMA @AIYIMA:GUO
Is it possible to somehow modify 5th opamp buffer to increase gain?
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