Guddu
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*** Note: No measurements are included in this thread ***
While I hope a Review with measurements comes through soon, I am putting together my observations here hoping to provide some clues to someone looking for ZA3 and quick comparison with Aiyima A07 Max.
Few other threads related to these two products:
Fosi ZA3: https://www.audiosciencereview.com/...3255-amplifier-with-mono-stereo-output.48226/
Aiyima A07 Max: https://www.audiosciencereview.com/...first-dual-mode-balanced-amplifier-za3.48552/
Fosi ZA3 amplifier joined my bench today, and currently placed alongside Aiyima A07 Max and Topping PA7
Quick visual inspection, and contents
* came in decent packaging, bigger than other Fosi amplifiers
* ZA3 amplifier, 48v 5a PSU, Manual
* Manual has all the basic information needed for connectivity
* ZA3 Amplifier Case & Construction
- Beautiful case, Orange volume knob like V3
- Slightly bigger than other TPA3255 amplifiers, quite a refreshing look
- Simple elegant look, don't think anyone would like to hide this amplifier
* PSU - Feels good build PSU
* Front
- ON/OFF and Volume Control Knob - Press and hold for ON/OFF
- Mono/Stereo Toggle switch
- RCA/XLR Toggle switch
* Back
- RCA Input: Single ended RCA input
- XLR/TRS: Balanced input accepts XLR as well as 1/4 TRS [@Fosi Audio It is really worth mentioning on product pages that ZA3 accepts 1/4 TRS balanced input, currently its XLR only everywhere]
- Sub Out: note: you will need to manage cut off frequency on the subwoofer itself
- 12v Tigger input
- Speaker Binding posts: Just like other Fosi amplifiers, small speaker connector binding posts. This is something Fosi could improve after V3 [Note: Plan to use 4mm banana plugs for safer and easy connection, there isn't enough space for spades or anything else]
- DC input jack, 24 - 48v PSU accepted: 5.5 x 2.1/2.5 mm connector
From: https://www.kickstarter.com/project...za3-hifi-stereo-mono-balanced-power-amplifier
My setup
Laptop >> Topping E50 DAC >> RCA & XLR to amplifiers >> Elac DBR62 speakers
Quick observations after powering UP and in-operation:
- With 48v 5a PSU, my ZA3 didn't even get warm. It ran very cool even after pushing to 84-86 db (from 3.5 - 4 meters).
- Idle power (powered ON but no music playing) remains around 8W
- Power ON/OFF, changing RCA/XLR makes click/relay-type sound
- Volume knob makes smooth volume transition
- Power ON/OF operation is push and hold sequence, don't need to change the volume knob position (thankfully) and so you don't loose volume level adjustment
- RCA and XLR inputs have different output levels, by SPL app showed around 5 db difference XLR being higher and RCA being lower
PE:
Sub-Out
- worked every time without any issues
- Volume knob controls sub pre-out level as well
- Only works when amplifier is powered ON
Quick listening with the setup mentioned above
- Sounds clean, powerful and good stereo separation
- ZA3 had no issues to make Elac DBR62 sing powerful
- 48v PSU makes you feel the power, if you are coming after other TPA3255 amps with 32v or 36v PSU
----------
***You can surely use the following comments as some pointers or completely ignore the following comments as its very subjective to my setup, in-room response and my taste:
- In my setup, time after time and track after track I kept of noticing slightly more punchier sound than my current regular amplifiers - Topping PA7 & Aiyima A07 Max.
All the recent Aiyima & Fosi TPS325x amplifiers measurements have shown flat response, at least up to 5-10K, and I am wondering why it felts like everything is slightly elevated (specially bass) in my setup/room with ZA3 while A07 Max and Topping PA7 don't. Its too bad that I don't have any way to measure.
- For me it's quite similar to SMSL SDB mode type sound, or loudness mode in traditional integrated amplifiers
- It surely has its own advantages, those who have heard SMSL SDB or loudness mode will be able to corelate easily, I hope
- It makes music listenable on low to moderate levels without feeling something is missing, but then it was a bit difficult for me to listen beyond 85-87 db
- Pls note that this could just be my room's response to this setup, rather than amplifier
- MusicBee 15 band EQ, lowering down 80 and 125 Hz a bit reduced/removed this loudness in my setup, but I liked it as it is
----------
Overall, It has everything to like. Its amazing for me that it is running cool while my other amps are at least warm to touch with similar output levels. PA7 even runs hotter all the time.
Mono mode
- Front toggle to select mono/stereo
- RIGHT channel input and speaker output becomes ACTIVE in Mono mode
- I honestly don't know yet how it operates internally in mono, but seems like LEFT channel shuts down.
- Without changing anything in setup like same connections and same volume knob position in Mono mode, volume level/SPL was similar or marginally higher based on SPL app on iPhone. I will check it once again as I expect higher SPL
- Note: Amplifier does not show which input has Mono operation on the back panel, but it shows Mono Speaker output on RICHT channel binding post.
- I only have one unit and so did not test dual mono setup and operation, however it should work as expected
Some Comparisons
-----------------------
Power Supply
Fosi ZA3 vs Aiyima A07
Again, I am hoping that a proper measurement based review comes through soon and these details might be used for quick product overlook and comparison.
Would also appreciate if you add anymore information based on your observation on this product.
While I hope a Review with measurements comes through soon, I am putting together my observations here hoping to provide some clues to someone looking for ZA3 and quick comparison with Aiyima A07 Max.
Few other threads related to these two products:
Fosi ZA3: https://www.audiosciencereview.com/...3255-amplifier-with-mono-stereo-output.48226/
Aiyima A07 Max: https://www.audiosciencereview.com/...first-dual-mode-balanced-amplifier-za3.48552/
Fosi ZA3 amplifier joined my bench today, and currently placed alongside Aiyima A07 Max and Topping PA7
Quick visual inspection, and contents
* came in decent packaging, bigger than other Fosi amplifiers
* ZA3 amplifier, 48v 5a PSU, Manual
* Manual has all the basic information needed for connectivity
* ZA3 Amplifier Case & Construction
- Beautiful case, Orange volume knob like V3
- Slightly bigger than other TPA3255 amplifiers, quite a refreshing look
- Simple elegant look, don't think anyone would like to hide this amplifier
* PSU - Feels good build PSU
* Front
- ON/OFF and Volume Control Knob - Press and hold for ON/OFF
- Mono/Stereo Toggle switch
- RCA/XLR Toggle switch
* Back
- RCA Input: Single ended RCA input
- XLR/TRS: Balanced input accepts XLR as well as 1/4 TRS [@Fosi Audio It is really worth mentioning on product pages that ZA3 accepts 1/4 TRS balanced input, currently its XLR only everywhere]
- Sub Out: note: you will need to manage cut off frequency on the subwoofer itself
- 12v Tigger input
- Speaker Binding posts: Just like other Fosi amplifiers, small speaker connector binding posts. This is something Fosi could improve after V3 [Note: Plan to use 4mm banana plugs for safer and easy connection, there isn't enough space for spades or anything else]
- DC input jack, 24 - 48v PSU accepted: 5.5 x 2.1/2.5 mm connector
From: https://www.kickstarter.com/project...za3-hifi-stereo-mono-balanced-power-amplifier
My setup
Laptop >> Topping E50 DAC >> RCA & XLR to amplifiers >> Elac DBR62 speakers
Quick observations after powering UP and in-operation:
- With 48v 5a PSU, my ZA3 didn't even get warm. It ran very cool even after pushing to 84-86 db (from 3.5 - 4 meters).
- Idle power (powered ON but no music playing) remains around 8W
- Power ON/OFF, changing RCA/XLR makes click/relay-type sound
- Volume knob makes smooth volume transition
- Power ON/OF operation is push and hold sequence, don't need to change the volume knob position (thankfully) and so you don't loose volume level adjustment
- RCA and XLR inputs have different output levels, by SPL app showed around 5 db difference XLR being higher and RCA being lower
PE:
Sub-Out
- worked every time without any issues
- Volume knob controls sub pre-out level as well
- Only works when amplifier is powered ON
Quick listening with the setup mentioned above
- Sounds clean, powerful and good stereo separation
- ZA3 had no issues to make Elac DBR62 sing powerful
- 48v PSU makes you feel the power, if you are coming after other TPA3255 amps with 32v or 36v PSU
----------
***You can surely use the following comments as some pointers or completely ignore the following comments as its very subjective to my setup, in-room response and my taste:
- In my setup, time after time and track after track I kept of noticing slightly more punchier sound than my current regular amplifiers - Topping PA7 & Aiyima A07 Max.
All the recent Aiyima & Fosi TPS325x amplifiers measurements have shown flat response, at least up to 5-10K, and I am wondering why it felts like everything is slightly elevated (specially bass) in my setup/room with ZA3 while A07 Max and Topping PA7 don't. Its too bad that I don't have any way to measure.
- For me it's quite similar to SMSL SDB mode type sound, or loudness mode in traditional integrated amplifiers
- It surely has its own advantages, those who have heard SMSL SDB or loudness mode will be able to corelate easily, I hope
- It makes music listenable on low to moderate levels without feeling something is missing, but then it was a bit difficult for me to listen beyond 85-87 db
- Pls note that this could just be my room's response to this setup, rather than amplifier
- MusicBee 15 band EQ, lowering down 80 and 125 Hz a bit reduced/removed this loudness in my setup, but I liked it as it is
----------
Overall, It has everything to like. Its amazing for me that it is running cool while my other amps are at least warm to touch with similar output levels. PA7 even runs hotter all the time.
Mono mode
- Front toggle to select mono/stereo
- RIGHT channel input and speaker output becomes ACTIVE in Mono mode
- I honestly don't know yet how it operates internally in mono, but seems like LEFT channel shuts down.
- Without changing anything in setup like same connections and same volume knob position in Mono mode, volume level/SPL was similar or marginally higher based on SPL app on iPhone. I will check it once again as I expect higher SPL
- Note: Amplifier does not show which input has Mono operation on the back panel, but it shows Mono Speaker output on RICHT channel binding post.
- I only have one unit and so did not test dual mono setup and operation, however it should work as expected
Some Comparisons
-----------------------
Power Supply
Fosi ZA3 vs Aiyima A07
Fosi ZA3 | Aiyima A07 Max | |
Summary | Stereo Amplifier with balanced and unbalanced inputs + Nicer looking case + Power ON/OFF is Volume knob push and hold sequence, volume re-adjustment isn't an issue after ON/OFF as it can remain same + Runs cooler than others even with 48v PSU + 63v smoothing caps, ideal for 48v PSU + + Balanced input, more importantly an additional input + Balanced input accepts XLR as well as 1/4 TRS ++ 12v trigger input + Dedicated sub out, but no cut of freq. mgmt on amp, cab be used with an active subwoofer only ~ Speaker binding posts and spacing is tight, limits the compatibility with various bare wire gauges, spades, etc. Sound: My setup and impression: Clean and punchy. You may ignore this as well. | Stereo Amplifier with unbalanced inputs + Case feels stronger ~ Power ON/OFF requires volume knob tuen down all the way, so volume re-adjustment requires everytime it is turned ON/OFF ~ Runs slightly warm with Aiyima 36v PSU + Runs cooler (or barely warm) like Fosi ZA3 with Fosi 48v PSU ~ 50v smoothing caps, although I have had no issues with 48v PSU but many would be skeptical about 48v PSU with this amplifier + Aux or line out, can be used with an active subwoofer with RCA input, and/or stereo signal input to another amplifier + Better binding posts with adequate spacing, no issues in using thicker wires or spades Sound: My Setup and impression: Clean, balanced, non-fatiguing. You may ignore this as well. |
Case size & appearance | Bigger than A07 Max Nicer looking case, feels premium for the price | Smaller than Fosi ZA3, but feels stronger Nice looking case |
Output Power (Stereo) | Similar or close enough with same spec PSU | Similar or close enough with same spec PSU |
Front Panel | Power On/Off + Volume Control Knob Power LED, orange/amber color, bright Mono/Stereo Toggle Switch RCA/XLR Toggle Switch | Power On/Off + Volume Control Knob, blue, brighter LED showing Power ON with Stereo or Mono Mode |
Back Panel | RCA input XLR/1/4 TRS balanced input Speaker binding posts, slightly smaller and cramped LFE type single port sub-out 12v trigger input DC input jack, 5.5 x 2.1/2.5 mm connector | RCA input Speaker binding posts, better quality and placement (very similar to Topping PA7/7 plus) 3.5mm AUX or Line Out DC input jack, 5.5 x 2.1/2.5 mm connector |
Air Vents | On both sides no vents on top plate | On both sides no vents on top plate |
Any issues observed, or things to be aware of | So far: 1) RCA/XLR switching did not work a few times until I powered ON/OFF 2) RCA/XLR volume output levels are different, 5db observed with SOL app on iPhone | Nothing really, other than slight warmer case when in operation |
Pop Out Noise on Power ON/Off operation, or with 12v Triger | Yes, it's faint but you can hear it when amplifier is powered ON/Off Same is the case with 12v Trigger | Almost negligibly faint, not an issue at all |
Again, I am hoping that a proper measurement based review comes through soon and these details might be used for quick product overlook and comparison.
Would also appreciate if you add anymore information based on your observation on this product.
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