AIYIMA A70 Stereo Amplifier Review

[Sylvia]

GaN doesn't do anything for audio quality or performance. Its benefits are about size and power losses in the PSU itself.

cheers

 

[Zoli64]

The 5A is the same, but with two channels of simultaneous output and a maximum power of 180 W x 2. The inductor is of excellent quality and does not need to be replaced.

So the A70 can output 2x180 Watts at 4 Ohms on both channels, in a short peak? I think it is capable of 2x125 Watts at least under 1 percent distortion. I'm sorry that it wasn't measured on Amirm's machine...
Thanks

 

[mlsstl]

The maximum wattage an amp can deliver will be determined by the power supply -- 5 amps X 48 volts = 240 watts, but also keep in mind that nothing runs at 100% efficiency, so even though class D amps are quite efficient, there is still going to be some loss. One also has the factor that with stereo music, the power demands of the left and right channels are not an exact match, though it is likely both a significant peak will have elements present in both channels. If you want the maximum output of the A70, particularly with lower impedence speakers, you'll want the 10 amp / 48 volt supply versus the 5 amp one. (All that said, I've been very pleased with my A70 and the 5 amp supply, but then I'm not a head-banger.)

 

[burkm]

Efficency for a Class D amp ist depending on the current output, but schould be appr. 90% overall...

 

[magreen]

The maximum wattage an amp can deliver will be determined by the power supply -- 5 amps X 48 volts = 240 watts, but also keep in mind that nothing runs at 100% efficiency, so even though class D amps are quite efficient, there is still going to be some loss. One also has the factor that with stereo music, the power demands of the left and right channels are not an exact match, though it is likely both a significant peak will have elements present in both channels. If you want the maximum output of the A70, particularly with lower impedence speakers, you'll want the 10 amp / 48 volt supply versus the 5 amp one. (All that said, I've been very pleased with my A70 and the 5 amp supply, but then I'm not a head-banger.)

You’re assuming that the 5A rating of the power supply is a hard and fast ceiling. Perhaps it can provide short bursts above that.

 

[Zoli64]

All sorts of guesses are possible, the only problem is that the 5A GAN factory power supply was not measured for 4 and 8 Ohms. This was a mistake, because it is the factory power supply. I am particularly angry about this, because since then no one has posted an authentic 48V/5A measurement on any website. I don't understand why he didn't do it either. Given that it is a factory accessory....

 

[burkm]

Why should there be a valid difference outside of the usual tolerance values (voltage / amperage) at 4 Ohms or 8 Ohms and what effects should it have on i.e. SQ ?
Because of those missing effects probably no one would measure it...

 

[Vlvvv]

Hello! Please tell me, the a70 can work in mono mode (like the fosi za3). That is, if I use 2 pieces of a70- one a70 for each of my speakers, then the power output from each a70 for each column will be higher? Thanks)

 

[hipoagu]

Hello! Please tell me, the a70 can work in mono mode (like the fosi za3). That is, if I use 2 pieces of a70- one a70 for each of my speakers, then the power output from each a70 for each column will be higher? Thanks)

Aiyima is announcing today an A70 mono.

 

[magreen]

Aiyima is announcing today an A70 mono.

Yes, one that will win the record for the most knobs and switches on a "monoblock" ever...

 

[cobby]

nice amp, looks like a option for me.
i dont see the problem with the sub out filter range as all subs have a own filter.
600hz max is a lot of course, but i could see some sense in setting it higher then the filter in your amp to that degree that i dont interfere with it.

 

[andrelambert_]

nice amp, looks like a option for me.
i dont see the problem with the sub out filter range as all subs have a own filter.
600hz max is a lot of course, but i could see some sense in setting it higher then the filter in your amp to that degree that i dont interfere with it.

No problem with the sub out filter, the main concern people have is that it doesn't have a high-pass filter for the main speakers when connecting a sub.

 

[magreen]

Psst: on sale now on Ali Express. $139 shipped w/ 5A power supply. https://www.aliexpress.com/item/1005007083566848.html
(also $30 off $239 coupon available)

I'm tempted to pull the trigger on this with a couple of other audio products that I might "need" sometime down the road to get the $30 off...

 

[cobby]

No problem with the sub out filter, the main concern people have is that it doesn't have a high-pass filter for the main speakers when connecting a sub.

i see, wasnt aware of that.
do consider this amp due to its sub out.
right now my ( just upgraded today to to Wharfedale 12.2) speakers are on an old Marantz AVR which does the bass managment, for fronts he set the sub to 40hz (lowest setting) which seems to be quite good.
So in my case the A70 would send the range below 40hz also to the fronts which are now cut by the AVR.

Am on the fence, going a bit more Hifi, compared to my Marantz NR1606 this unit meassures waay better for sure.
On the other hand it might become hard to really integrate it well with the AVR.

 

[cobby]

Psst: on sale now on Ali Express. $139 shipped w/ 5A power supply. https://www.aliexpress.com/item/1005007083566848.html
(also $30 off $239 coupon available)

I'm tempted to pull the trigger on this with a couple of other audio products that I might "need" sometime down the road to get the $30 off...

also tempted, while i dont think we need to hurry, good offers on Ali come every few days.

 

[cobby]

hm, this amp really seems to be almost perfect for my usecase and data wise its a no brainer it seems.
you guys are right with the HPF filter problem... as i plan to connect my sub directly to it on one input and on the the AV receiver who needs a higher cutoff for the sat then the a70 would need with the fronts (plan to set it to 40 or 50hz).

Only way seems to be a filter added inline to the sub, is there any good option?
probably using a small DSP is the best way here.

 

[Rover]

I liked the AIYIMA A70 more than the Fisi z3 b v3 mono.Clearer low frequencies and higher-pitched sound are more detailed.PFFB and a more even frequency graph measured by Amirm apparently affect this.

 

[cobby]

i admit that i bought one allready 140€ something with the 5A supply, it will the do the job for sure and will be quite a step from the marantz 1606 amp, while i have to say i cant complain of the marantz sound.
DAC is itching in my fingers, still the 300SE on the buy list.

As you mention i of course also compared every graph of the fosi mono to the a70 .

 

[ElMediaVida]

Hey guys, someone here have the amp with a Wiim Mini?

I want to buy the A70 and pair with a Wiim Mini, mostly I use music stream apps. I tryed the Wiim Amp but I don't like it because I feel some week vs Aiyima A08 Pro.

 

[Monamtb]

Thank you very much for your help. So it's decided, I'll buy aiyima a70

I got the Aiyima A70 yesterday, and compared it to my Topping PA3s.
On lowest volume of the dial there was only the left channel playing off my PSB Alpha 3s - for about a few degree rotation the right channel joined in.
Since I oftentimes also love to listen at low volume this is unacceptable for me - returned it right away.

Soundwise I was surprised that my topping played nicer to my ears, more detail, larger soundstage, more depth of the voices and instruments in the Alpha 3s.

I use a Topping D10s DAC with a Sparkos SS3602 op amp.

Since this is my travel setup it seems like I can't get any better than with the Topping PA3s and it has more than enough power to drive my Alpha 3s I can hardly go to the 11 o clock position without disturbing the neighbours - would be too loud anyway - and depending on the recording.