Fosi ZA3 TPA3255 Mono/Stereo Switchable Amplifier, and vs Aiyima A07 Max

[doug s.]

The Aiyima A07 Max is poor performer....huge channels dismatch..... To put it mildly, a big design error.
If ASR tests exist it is precisely to avoid this type of error that you have just made)))



View attachment 349000

108db VS 88db is a huge difference for me.....
As such, if you don't see the difference or the problem with this Aiyima A07 Max, you might as well not read the tests offered by Amir....

nope, sorry - amir's sample was obviously an anomaly, re: channel balance. even if you think 1db gain difference is "huge". there's absolutely NO channel mismatch with my amps. and, i don't use their volume pots anyway - they're wide open, w/my preamp controlling the volume. imaging is dead center.

shake your head, but i made NO error - these are fantastic amps! and why should i not read these asr reviews? they're just one data point. and while 88db vs 108db sinad is a huge difference to you, since it's a difference that is totally inaudible, it's not even a tiny bit important to me.

wait for your sylph audio amps; i'm sure they will be nice. and if it makes you happy, spend more for them, because they undoubtedly will look better on paper. even if they don't sound any better.

believe me, i'm interested in measurements. it's useful to know when the measurements are good enough that no difference will be heard.

doug s.

 

[daniboun]

nope, sorry - amir's sample was obviously an anomaly, re: channel balance. even if you think 1db gain difference is "huge". there's absolutely NO channel mismatch with my amps. and, i don't use their volume pots anyway - they're wide open, w/my preamp controlling the volume. imaging is dead center.

shake your head, but i made NO error - these are fantastic amps! and why should i not read these asr reviews? they're just one data point. and while 88db vs 108db sinad is a huge difference to you, since it's a difference that is totally inaudible, it's not even a tiny bit important to me.

wait for your sylph audio amps; i'm sure they will be nice. and if it makes you happy, spend more for them, because they undoubtedly will look better on paper. even if they don't sound any better.

believe me, i'm interested in measurements. it's useful to know when the measurements are good enough that no difference will be heard.

doug s.

In any case if you are happy with your Aiyima I hope you keep it as long as possible) It will prevent us from cutting down trees and preserving the planet

 

[doug s.]

In any case if you are happy with your Aiyima I hope you keep it as long as possible) It will prevent us from cutting down trees and preserving the planet

i agree 100%. i am extremely conscious of issues regarding the preservation of the earth's biomes. (ever hear of earth overshoot day? the circular economy? degrowth? check 'em out.) i hardly ever purchase anything new, except things like toilet paper - heh! and even then, i purchase tp sourced from 100% recycled goods. i'm in my 7th decade, and i have never purchased a new vehicle. 95% of my audio system was purchased used.

the reason i considered purchasing these new amps, was because, together, they draw ~12w at idle; replacing the (used) amps i was using that draw ~300w at idle... and, compared to typical amps, they're each about twice the size of a deck of playing cards... i suspect i will be keeping them - in use - for quite a long time.

doug s.

 

[LSPhil]

I would like to show you the meaning of 80 dB. -80dB means 100,000,000 smaller. So if I have an amplifier that delivers 1000W, the interference signal is 10μW. I don't know of any speaker that can play 10μW and also 1kW. Humans can't do that either. I can still hear 20dB and if I add my 80dB I'm at a painful 100dB. I'm afraid to think what would happen at 100dB.

 

[T&T]

I have no problems with Aiyima 07Max...I sold my Fosi V3 since 07Max sounds better with Muses02, I tried the dual akliam lc2, noisy opamp on 2 Dac and Amp, pops all the time, so not sure what is the hi on Aliexpress, any of my opamps sounds better.

 

[doug s.]

I have no problems with Aiyima 07Max...I sold my Fosi V3 since 07Max sounds better with Muses02, I tried the dual akliam lc2, noisy opamp on 2 Dac and Amp, pops all the time, so not sure what is the hi on Aliexpress, any of my opamps sounds better.

the akliam lc2 sounds very nice in my a07 max; it's quiet, no weird popping noises, etc. maybe yours was/were defective? what power supply were you using; maybe it doesn't like less than the 48v/5a supply? i haven't tried any other op amps, except the stock op amps that came w/it.

doug s.

 

[T&T]

the akliam lc2 sounds very nice in my a07 max; it's quiet, no weird popping noises, etc. maybe yours was/were defective? what power supply were you using; maybe it doesn't like less than the 48v/5a supply? i haven't tried any other op amps, except the stock op amps that came w/it.

doug s.

The pop noise is only went is power on but sparkos ss3602, Muses02, opa1656 sounds better

 

[doug s.]

The pop noise is only went is power on but sparkos ss3602, Muses02, opa1656 sounds better

i haven't heard any pops at all. interesting, re your sonic impressions; most folks seemed to prefer the lc2 over the muses02. which power supply are you using? one sparkos costs the same as the amp itself. still relatively inexpensive, in the grand scheme of things...

doug s.

 

[T&T]

i haven't heard any pops at all. interesting, re your sonic impressions; most folks seemed to prefer the lc2 over the muses02. which power supply are you using? one sparkos costs the same as the amp itself. still relatively inexpensive, in the grand scheme of things...

doug s.

The best time to buy Sparkos is on BlackFriday, using 48v power and Geshelli akm4499 with Wiim Pro.

 

[Kimbrough Xu]

Here is the review: https://www.audiosciencereview.com/forum/index.php?threads/fosi-audio-za3-amplifier-review.52139/

 

[GabrielPhoto]

I ordered this from Amazon:

Amazon.com

But what I received was this instead :/

 

[Bruce Morgen]

I ordered this from Amazon:

Amazon.com

But what I received was this instead :/
View attachment 359551

...and problem is? Do you think Aiyima actually makes and/or bothers to rebrand the commodity power bricks they sell? It sure looks like you got what you paid for from here -- so, what am I missing?

 

[GabrielPhoto]

...and problem is? Do you think Aiyima actually makes and/or bothers to rebrand the commodity power bricks they sell? It sure looks like you got what you paid for from here -- so, what am I missing?

Is what I received the advertised GaN? Does it look like the photos and model listed at all????

 

[Bruce Morgen]

Is what I received the advertised GaN? Does it look like the photos and model listed at all????

Ah, so the type of semiconductor mentioned in the listing is your issue -- gotcha!

 

[Joe Smith]

Is what I received the advertised GaN? Does it look like the photos and model listed at all????

Other people have reported a similar problem, that they had ordered the new and more expensive adapter and instead received the old one... The people doing fulfillment do not seem to see the items as distinct...

 

[Guddu]

Is what I received the advertised GaN? Does it look like the photos and model listed at all????

GaN 48v 5a for 56.99$ cannot be true, but you should query the seller. However, It seems decent price for non-GaN psu to me.
You can always send it back if you want to stick to GaN.

 

[GabrielPhoto]

GaN 48v 5a for 56.99$ cannot be true, but you should query the seller. However, It seems decent price for non-GaN psu to me.
You can always send it back if you want to stick to GaN.

Well it does add power compared to the regular and it seems other than size, I wont get much benefit from the GaN so I guess I will just move on and keep it lol

 

[Kimbrough Xu]

Is what I received the advertised GaN? Does it look like the photos and model listed at all????

They seems to very like to change the products they sell.

 

[Rneeaak]

wow... i bought my 1st pair of subs 30 years ago, when my main speakers - thiel 3.5's - were 2db down at 20hz. the improvement in the low end, and to the thiels as well, as they were actively crossed over at 80hz so they and the amp driving them didn't have to deal with low frequencies, was exceptional. i won't ever listen to my audio playback system without subwoofers. it's because i like every song i choose to listen to, and i want to hear it done right. and, it's also why many major speaker mfr's actually provide subwoofer towers as part of their speaker systems.

sorry, old timer, you've been missing out all these years.

my present set-up, actively quad-amped. it's flat from 20hz-20khz, just from manipulating the volume controls on the active 24db/octave x-overs; no dsp. yes, it's true, if there's no low frequency content in a recording, your subs won't be doing anything. so what?
View attachment 341304

enjoy your less-than full-range listening, old timer.

doug s.

What did you do with those Thiel 3.5? They were amazing speakers for spatial / soundstage resolution and time coherence, iirc. Ever so slightly bright though, but nothing a bit of eq could not remedy.

 

[Rneeaak]

In my ZA3 setup, I have the volume of my ZA3 maxed out and I use my Teac UD503 as DAC and preamp. I have a Pi4 acting as a streamer for my NAS music store. I also am running my analog sources through a cheap ADC and using Optical input for that full chain - seems a bit quieter than using the native analog line in for the UD-503. I have used both RCA and XLR - the balanced XLR connection to the ZA3 produces the extra volume as expected and that's my preferred solution. I only touch the ZA3 volume knob when I want to put it in standby mode. In my use, I have seen no channel volume mismatch/imbalance as mentioned a bit in some ZA3 threads. The SUB-Out capability was a real game changer for me and has made some of my legacy equipment now very nervous indeed. My speakers are B&W DM12a which are not very efficient and tend very close to 8 ohms average impedance, so are not terribly easy to drive. The ZA3 has done a better than expected job in that regard and my usually listening level is at -31.5db to -15bd on the Teac volume control. At the max level, it is not loud but authoritative enough in its presentation for my needs.

I am still considering giving the Ayima A07 MAX a try just for fun. I have the non max A07 and the only issue for me was the lack of sub out. That said, creating Y cable connections form the Teac UD-503 to the sub was something I first did as a test and it was also good, so the specific need to have a dedicated SUB-out is nearly not life and death for me. But why not take advantage of a cheap option which does all that I need

Well, the sub out on the A07 Max is fixed-level, i.e. the volume control on the Max won’t change the sub signal.