Hi!
I would like to share with you my own listening experience with the new Fosi Audio ZA3.
The Fosi Audio ZA3 is a compact integrated class D amplifier that can operate in both stereo and mono mode. It is equipped with two Texas Instruments TPA3255 amplifier chips which allows it to output max power up to 2×155 W (in stereo mode) or 1×235 W (mono mode) @4 Ohm load with a 48V/5A power supply unit.
This quite tiny amplifier is equipped with stereo RCA and balanced XRL inputs; classic speaker terminals (supporting banana plugs or bare wire connection), plus an output for an active subwoofer. In addition, there is a 12V trigger available on the back panel: this feature allows to power on/off the ZA3 especially if you use two of them in pair as mono amplifier.
Packaging and esthetical appearance: the Fosi ZA3 amplifier arrived with a nice compact package that includes the power adapter with cable, which will match the one used in your country, and manual user.
I like very much how the amplifier looks like and how you can feel it in your hands. The case seems to be very solid and give you a good impression and the effort that Fosi has put in the design is also quite clear with the choice of colors (I love the orange knob) and the side holes which, in addition to being very useful for heat dissipation, are very attractive due to the presence of the net with the same color of the knob. The size is a little bit bigger compared to my Fosi BT20A Pro, as you can see on the third picture, but remain still compact allowing more space for more connections.
Below some technical specifications directly from Fosi Audio web page:
Chip Set Texas Instruments: TPA3255
Output Power: With 48V/5A PSU
Stereo: 155Wx2 @4Ω
Mono: 235Wx1 @4Ω
With 32V/5A PSU
Stereo: 95Wx2 @4Ω
Mono: 110Wx1 @4Ω
Terminating Impedance: 2-8 Ω
Frequency Range: 20 Hz – 20 kHz (±0.1dB)
SINAD 89 dB
THD <0.006%
SNR ≥106 dB
Dynamic Range ≥106 dB
Concerning the output power, thanks to a friend of mine, I had the opportunity to check it on ZA3, and I wasn’t believing how much power you can get from this small amplifier:
Fosi Audio ZA3 is equipped with high-quality components like German Wima capacitors, Japanese NCC and ELNA capacitors, and Japanese Sumida inductors.
I have already seen different graphs and detailed measurements done by other people and all of them look great.
What about how this small amplifier sounds? My setup was a Pro-Ject turntable with integrated phono stage + Fosi ZA3 + Dali Oberon 5 speakers (6 Ω impedance). The turntable was connected to the amplifier via RCA cables.
The sound is warm and full with nice low frequencies, for sure due to the neutral frequency response I saw on graphs available on some forums, and the soundstage is large and detailed. You can feel the position of each instrument and musicians in front and behind the line of the speakers and this makes the listen experience more emotional, clean and vivid. I compared the same set up (turntable + speakers) with my Fosi Audio BT20A Pro, and I can easily say that the ZA3 sounds better and punchier.
At the end, what I liked:
I didn't have the opportunuty to test the XRL imputs or to test the amplifier as mono (I have only one), but I hope my post can be useful for one of you.
What about your idea? Did someone have the chance to listen such kind of amplifiers?
Thanks
I would like to share with you my own listening experience with the new Fosi Audio ZA3.
The Fosi Audio ZA3 is a compact integrated class D amplifier that can operate in both stereo and mono mode. It is equipped with two Texas Instruments TPA3255 amplifier chips which allows it to output max power up to 2×155 W (in stereo mode) or 1×235 W (mono mode) @4 Ohm load with a 48V/5A power supply unit.
This quite tiny amplifier is equipped with stereo RCA and balanced XRL inputs; classic speaker terminals (supporting banana plugs or bare wire connection), plus an output for an active subwoofer. In addition, there is a 12V trigger available on the back panel: this feature allows to power on/off the ZA3 especially if you use two of them in pair as mono amplifier.
Packaging and esthetical appearance: the Fosi ZA3 amplifier arrived with a nice compact package that includes the power adapter with cable, which will match the one used in your country, and manual user.
I like very much how the amplifier looks like and how you can feel it in your hands. The case seems to be very solid and give you a good impression and the effort that Fosi has put in the design is also quite clear with the choice of colors (I love the orange knob) and the side holes which, in addition to being very useful for heat dissipation, are very attractive due to the presence of the net with the same color of the knob. The size is a little bit bigger compared to my Fosi BT20A Pro, as you can see on the third picture, but remain still compact allowing more space for more connections.
Below some technical specifications directly from Fosi Audio web page:
Chip Set Texas Instruments: TPA3255
Output Power: With 48V/5A PSU
Stereo: 155Wx2 @4Ω
Mono: 235Wx1 @4Ω
With 32V/5A PSU
Stereo: 95Wx2 @4Ω
Mono: 110Wx1 @4Ω
Terminating Impedance: 2-8 Ω
Frequency Range: 20 Hz – 20 kHz (±0.1dB)
SINAD 89 dB
THD <0.006%
SNR ≥106 dB
Dynamic Range ≥106 dB
Concerning the output power, thanks to a friend of mine, I had the opportunity to check it on ZA3, and I wasn’t believing how much power you can get from this small amplifier:
Supply power | Impedance | Power (1 kHz, THD 1%) - left channel | Power (1 kHz, THD 1%) - right channel |
48V / 5A | 8 Ohm | 95 W | 96 W |
48V / 5A | 4 Ohm | 175 W | 177 W |
Fosi Audio ZA3 is equipped with high-quality components like German Wima capacitors, Japanese NCC and ELNA capacitors, and Japanese Sumida inductors.
I have already seen different graphs and detailed measurements done by other people and all of them look great.
What about how this small amplifier sounds? My setup was a Pro-Ject turntable with integrated phono stage + Fosi ZA3 + Dali Oberon 5 speakers (6 Ω impedance). The turntable was connected to the amplifier via RCA cables.
The sound is warm and full with nice low frequencies, for sure due to the neutral frequency response I saw on graphs available on some forums, and the soundstage is large and detailed. You can feel the position of each instrument and musicians in front and behind the line of the speakers and this makes the listen experience more emotional, clean and vivid. I compared the same set up (turntable + speakers) with my Fosi Audio BT20A Pro, and I can easily say that the ZA3 sounds better and punchier.
At the end, what I liked:
- of course how the music goes out of the speakers in terms of imaging and separation, it’s crazy how good this amp sounds for the price.
- the design of this brand new Fosi amplifier.
- The 12V trigger input.
- The possibility to change the op-amps very easily, so you can have your personal signature with your own amplifier.
I didn't have the opportunuty to test the XRL imputs or to test the amplifier as mono (I have only one), but I hope my post can be useful for one of you.
What about your idea? Did someone have the chance to listen such kind of amplifiers?
Thanks
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