AIYIMA A07 TPA3255 Review (Amplifier)

[ampguy]

I bought one of these amps just for fun. Right now it is running my high-end speakers, some B&W801D4s sounds crazy but they also sound very good. I think I upgraded the little amp by changing out the op-amps in them to some Burr Brown. It was very easy to do and I did research the op-amps to find some that had better specs. It was easy to do and I do think the sound improved. I can say that they make my speakers sound fantastic as they should. I would certainly recommend this little amp for anyone that has speakers that are not power hungry.

I'm guessing 4 ohm speakers, right? This amp, like the SMSL A300, specs rather poorly, but somehow many find great sounding. Go figure!

 

[antcollinet]

Go figure!

Human hearing is not as good as many think it is.

 

[Haskil]

Human hearing is not as good as many think it is.

Exact... in addition to which this amplifier does not have such mediocre performance...

 

[antcollinet]

Exact... in addition to which this amplifier does not have such mediocre performance...

I'd agree. Even if not as good as the best of the best, it is still well into the green category with any issues being below the level of audibility in real world listening.

 

[rintintin78]

Hi, with this amplifier with 32V 5A power supply with the volume at maximum how much effective RMS power does it have? And how many watts does it actually deliver?
I use it with BST-1 - Bass Shaker Dayton Audio - 50W (50 Watts on 4 ohms RMS), if I set the volume to 90% do I risk ruining them?
Thanks

 

[pma]

It should be similar as measured here:

AIYIMA A07 amplifier test review

 

[Toku]

Hi, with this amplifier with 32V 5A power supply with the volume at maximum how much effective RMS power does it have? And how many watts does it actually deliver?
I use it with BST-1 - Bass Shaker Dayton Audio - 50W (50 Watts on 4 ohms RMS), if I set the volume to 90% do I risk ruining them?
Thanks

When using a 32V power supply, the A07 can be thought of as 100W/4Ω or 50W/8Ω at 1% distortion.

 

[pma]

When using a 32V power supply, the A07 can be thought of as 100W/4Ω or 50W/8Ω at 1% distortion.

This will never happen, it is an idealistic guess based on pure theory only. Even the manufacturer says 78W/4R and 65W/8R for 32/5 power supply and even this statement is to be verified by an independent measurement.

 

[18000rpm]

Not sure if it has been posted in this thread, actual tests

53W+53W @ 8ohm 1% distortion with 32V 5amp power supply
95W+92W @ 4ohm 1% distortion with 32V 5amp power supply

120W+116W @ 8ohm 1% distortion with 48V 5.2amp power supply
170W+163W @ 4ohm 1% distortion with 48V 5.2amp power supply

 

[Tmountain]

I recently purchased the Philharmonic Ceramic Minis and it's rated at 4 ohms with a sensitivity of 84dB. I will be using it for nearfield (on my desk at my computer) listening. I already own the Aiyama A07 with a 32V 5A power supply, would these be sufficient in powering those speakers considering I will be sitting approximately 2-3 ft away?

Also on a side note, would it be possible to utilize a subwoofer (RSL Speedwoofer 10s mkii) with this amp despite not having a sub out? If so, how?

 

[18000rpm]

I recently purchased the Philharmonic Ceramic Minis and it's rated at 4 ohms with a sensitivity of 84dB. I will be using it for nearfield (on my desk at my computer) listening. I already own the Aiyama A07 with a 32V 5A power supply, would these be sufficient in powering those speakers considering I will be sitting approximately 2-3 ft away?

Also on a side note, would it be possible to utilize a subwoofer (RSL Speedwoofer 10s mkii) with this amp despite not having a sub out? If so, how?

For near field it should be totally fine.

The RSL subwoofer has speaker level inputs so you can use it with your speaker and the Aiyama.

But I suggest you look into the Wiim Ultra as a preamp and streamer. It will give you actual subwoofer output (so low frequencies will not go to your speaker), and it also provides room correction using an iPhone.

 

[rintintin78]

Hi,
thanks to all, but in 3 replies I received 3 different information. I'm a bit confused

 

[rintintin78]

Can you advise me what volume to set to not exceed the 50 watts of the BST-1 - Bass Shaker Dayton Audio - 50W (50 Watts on 4 ohms RMS)

 

[antcollinet]

The RSL subwoofer has speaker level inputs so you can use it with your speaker and the Aiyama.

You have to be careful with speaker level inputs and BTL amps like the Aiyama - most subs will tie one speaker terminal to ground which could damage the amp.


Better to use line level splitters upstream of the amp (between source and amp) and connect to the Sub that way.

 

[Bruce Morgen]

most subs will tie one speaker terminal to ground which could damage the amp.

I don't think this is true -- at least every post-Y2K powered sub I've encountered has its speaker level inputs isolated from each other. Surely there would be some sort of warning notice in sub manuals about that since, as you pointed out, it "could damage the amp."

 

[rintintin78]

Can you advise me what volume to set to not exceed the 50 watts of the BST-1 - Bass Shaker Dayton Audio - 50W (50 Watts on 4 ohms RMS)

anyone help me?

 

[staticV3]

anyone help me?

To limit output power to 50W at 4Ω, you want to set the A07's volume so that with your DAC maxed out, the A07's output voltage does not exceed 14Vrms.

Since different DACs have different output voltage, there is not one A07 volume that'll guarantee 50W limit regardless of the DAC.

Therefore, to set a 50W limit, you'll have to use a basic, general purpose multimeter to measure the A07's output voltage yourself.

 

[rintintin78]

To limit output power to 50W at 4Ω, you want to set the A07's volume so that with your DAC maxed out, the A07's output voltage does not exceed 14Vrms.

Since different DACs have different output voltage, there is not one A07 volume that'll guarantee 50W limit regardless of the DAC.

Therefore, to set a 50W limit, you'll have to use a basic, general purpose multimeter to measure the A07's output voltage yourself.

can you explain to me how to do it?

 

[pma]

anyone help me?

Use 19V/3.4A notebook power supply. I tested it: post #49

AIYIMA A07 TPA3255 amplifier with MW RS-100-24 SMPS power supply (measurements)

Why do we have zero to few, if any sources for enclosures for these open cage units? Because these units are primarily intended for industrial automation and IT technologies and are built in caseworks of the completed gear.

www.audiosciencereview.com

You are just below 50W.

 

[staticV3]

can you explain to me how to do it?

Play a 60Hz, 0dBFS test tone on your DAC on loop (attached below)

Disconnect your speakers from the A07

Set the Multimeter to V AC, Auto ranging, then probe one pair of the speaker terminals (one channel) with the two multimeter probes.

It does not matter which probe goes to which terminal, as long as both terminals are from the same output channel.