Fosi Audio ZA3 Balanced Stereo/Mono Amplifier HiFi with TPA3255 Chips, Mini Audio Amp Monoblock with XLR RCA Inputs and 12V Trigger-in for Desktop Bookshelf Passive Speakers with 48V5A Power Supply

These are an amazing amp for the money. There’s plenty of reviews on YouTube comparing them to £7000 amps they are that good. Brilliant as a stereo amp and even better as a pair set in mono connected via xlr. Great paired up the pre amp ZD3 if you’ve using a streamer or CD player as source. Ignore the audiophile snobs and the lack of reviews on sites like what hi-fi that depend on pushing big names to fund their site. What’s even better is you can crack these amps open and swap out the opamp chips for even better performance.There’s so much power in these that you could easily power big 100w speakers as well as 30W book shelf speakers. Sleek and clean look small in size so two fit nicely side by side. Easy to connect put blistering performance for the money. Only sight negative if used in mono it lowers the subwoofer volume . So you may need to up the gain to compensate.

So...in my opinion...this is were Class D now defeats Class A-B amplifiers.I have these with the ZD3 - running in mono. The installed NE5532 op amps in the ZA3's are ok but after doing research I found the best op amps that are inexpensive. The LM 4562 Op Amps...provide stunning clarity and resolution. Even without this modification..the ZA3 is a truly innovative product.The ZA3 has dual amplification chips...not a single unit. This provides the greater resolution and fidelity.The ZD3 already has these installed and the resolution is superb.Don't forget the ZA3 has balanced XLR inputs..which is class leading in terms of inputs. In such a small unit !The sound is so refined and detailed.Buy yourself a power supply filter for your wall sockets and some ferrite cores and this further improves detail for any sound system.I did buy a second ZA3 - added the LM 4562's of which 3 are required for left - right & XLR input. 5 - if you have a subwoofer.The 12v trigger is so convenient...just by a good length 3.5 jack splitter cable to control both ZA3's with the remote.So I purchased the extra ZA3 and upgraded to mono. Each dual amp chip in each ZA3 - now controls one speaker - providing greater power and detail. I'd say it has boosted speaker detail and power delivery by 40%.What's interesting is that this isn't just about volume/gain...it increases depth and detail greatly. Is it necessary? No.Other amps in Class D - have only one amplifier chip and can't match the resolution of the ZA3. What's interesting...if you check vastly more expensive amps - check what op amps they are using. Very often it is the standard NE 5532's or OPA.The LM 4562 chips are sort of a hidden gem in op amps...fast and detailed and the fosi ZA3 is hardware compatible with their greater resolution and depth. It's only £10 for two chips...but make sure they are genuine.I have wharfdale 9.1 diamond speakers...and for the first time..I modded the crossover to film foil capacitors which I didn't think I would be capable of doing. Just takes a little time and I have never soldered before...but I gave it a go and it improved the quality of output greatly.The ZA3 is a power efficent and small device with just about everything you'd want for a high end audio system.I think it is a genius product that is vastly underrated. Even prestigious audiophiles are using the ZA3 in mono configuration.

Excellent amp!Lots of power!Greeat sound quality!I love the styling, and even like the volume button being the on off switch, it makes a lovely noise when you turn it off lol...Mine came with a 48v 5a psu, couldnt be happier with this purchase, seems great value!

Well, sadly it was DOA. Tried with three sources and two sets of speakers; RCA and XLR. The PSU was fine, putting out 48V, and I even threw a multimeter over my dac's xlr outputs as a final sanity check. Item has been returned and if the replacement works I'll let you know.......Well the replacement arrived and is working. As a stand on whilst my main amp is repaired I have to say I'm very impressed. Running some favourite tracks from Roon the immediate takeaway is that if I didn't know my main amp is better I could live with this quite happily. When repairs are complete I'll build a system around this for my reading room

Fosi Audio's best amp in my book, especially when paired with the ZD3 as I have it for my desk top system. Superb value for the money, I still can't believe how cheap it was and still is. The amp drives every speaker I have with absolute ease!! Great sound stage as well. Just a fantastic bit of kit as they say, TOP MARKS FosiA Further UPDATE, as I have now purchased a second ZA3, I've been so impressed with the first one in 'Stereo', I thought it would be rude not try the ZA3's in 'Mono' so required a second ZA3.Boy oh boy, this set up is just fantastic, the sources are CD via coaxial, Laptop via USB, mobile phone via B/T for streaming. All three through the ZD3, acting as DAC & Preamp, with the ZA3's working in 'Mono'. I can't believe how much better everything sounds, more defined instrumentation, cleaner sounding mid range and treble, with a more powerful bass punch, with an even wider soundstage.Absolutely amazing, completely blown away, and I'd say this little set-up, drives my floor standing speakers just as well as my Cambridge Audio CXA81 MkII integrated amp does, for half the price.Now contemplating on the purchase of the ZP3 to act as pre-amp, with the ZD3 as DAC only, so I can incorporate my T/T into this 'little' combo.

Bought this to pair with an Onkyo TX-RZ50 so I can run a 7.1.4 atmos setup and it’s spot on for what I need. Previously bought an Ayama amp for the same job but very quickly realised that it was a pain having to turn off the amp separately when powering everything down. The Onkyo has a 12v trigger circuit on board to allow for power control so it seemed crazy not to take advantage of this so the Av amp can shut everything down once finished (1st world problems I know). The amp itself is a complete doddle to set up and get going, but I did have a slight issue which I soon found the cause of in as much as when I 1st tried to power it up it wouldn’t come on - even though I followed the instructions, turned out that it was the power connector going into the back of the amp that wasn’t quite pushed all the way home - hence my slight “quibble” with the amplifier in that the power connector when pushing it in feels a little vague. What I mean by that is that usually with these types of connectors they feel a little more positive when you insert them - you can usually definitely tell just by the feel it’s seated properly and the connection is good, this one however as I say feels a little vague and it’s worth checking its seated all the way home ( I’d normally expect to feel more of a slight “click” when it’s fully seated, this one doesn’t)Don’t get me wrong once it’s seated I do think it’ll be fine as it’s not like I’ll be moving the amp at all now - especially as I have the 12v trigger circuit wired so I don’t need to touch it all now. However if you don’t use the trigger ciurcuit and power the amp down manually after every use I could potentially see the connector drifting out slightly over time and you might find it won’t turn on!Other than that I would absolutely recommend this little amp - if like me you need to power extra channels and you also are looking for something that has the 12v trigger integrated for separate control!

After much thought, I purchased two of these Amps to work in conjunction with the Fosi DAC ZD3 that I had previously purchased. I have both Amps set up in Mono to the DAC. The DAC does the channel separation. I have not lived with the system for very long, but initial impressions are that these are incredibly good amplifiers that really punch out good clear sound. They are also now possibly exposing the weakness of my speakers, but that could also be just another head rouse to purchase a different set of speakers.I like the fact that I can later play around with Op Amps, and that will take my Hi-Fi hobby into another dimension.I did have a little trouble setting up the triggers to both Amps, but that was easily overcome by purchasing a 3.5mm male jack headphone splitter that goes into two 3.5mm female ends. I have then added two short 3.5mm male to male cables to go from the DAC (now doubled) trigger to the amps. It works perfectly and the trigger does not seem to mind a double (stereo) 3.5mm lead for it to work.CEC works brilliantly on the DAC, so I can now turn on the whole set up from my smart television. The television is hooked up to the DAC via eArc HDMI, so a digital signal is received at the Fosi DAC, which is in turn doing all the heavy lifting to convert sound to an analogue signal, which it passes to the Amps. The Amps are turned on by the 12v triggers rather than the CEC signal.

Completely different shade of grey compared to the other ZA3 unit I ordered so they don't match when stacked. This is the issue with cheaper audio, no consistency. It does the juob but there is also a clicking noise every time the sound starts and stops, very irritating.

He comprado 2 unidades del Fosi ZA3 para usarlos en Monoblock (mono) uno a cada una de las cajas que tengo JBL. Espectacular siendo un amplificador bastante económico la potencia que entrega. No altera el sonido y reproduce exactamente la calidad de las 2 fuentes que les he conectado, la interfaz de audio Focusrite por el RCA y una Denon Prime Go+ por su XLR. No se aprecio distorsión alguna y el balance es bueno. Muy contento. La fuente es voluminosa de 48V y con un solo amplificador en estéreo seguro que irá también como un cañón en rendimiento aunque no lo he probado todavía. Me hubiera gustado un interruptor para el ON/OFF fuera del mando de volumen, pero vamos.

Not fit for purpose in Ireland….Comes with two pronged plugs!,,,,,

Ho acquistato il Fosi Audio ZA3 con l'alimentatore potenziato da 48V per completare il mio impianto Hi-Fi da scrivania a componenti separati, e devo dire che il risultato finale è andato ben oltre le mie aspettative.Il mio Setup attuale:L'amplificatore è l'ultimo tassello di una catena interamente collegata sul mio PC desktop:* DAC: Fosi Audio ZD3 (collegato via USB con driver ASIO bit-perfect su Qobuz)* Preamplificatore / Amp Cuffie: Fosi Audio ZH3 (unito al DAC via RCA e collegato allo ZA3 tramite cavi XLR bilanciati)* Finale di Potenza: Fosi Audio ZA3 (questo modello, impostato in modalità STEREO)* Diffusori: Coppia di Klipsch R-41M + Subwoofer attivo Yamaha NS-SW100BL (collegato all'uscita SUB OUT dello ZA3)Prestazioni acustiche e potenza:In modalità Stereo (alimentato a 48V), lo ZA3 è un vero e proprio mostro di potenza. Ha una riserva di dinamica enorme. Pilota le mie Klipsch R-41M (che hanno una sensibilità di 90 dB) con una disinvoltura disarmante. Il suono è incredibilmente vivo, arioso e trasparente sulle medie e alte frequenze, tipiche delle trombe Klipsch.L'uscita dedicata per il subwoofer funziona a meraviglia: lo ZA3 gestisce i diffusori principali mentre il mio sub Yamaha copre le frequenze ultra-basse dal pavimento, creando un palcoscenico sonoro tridimensionale pazzesco per essere su una scrivania.Comodissima la presenza del trigger 12V: ho collegato i tre dispositivi a cascata e con un solo click sul telecomando dello ZD3 si accende l'intera torre simultaneamente e in totale silenzio (senza alcun "pop" o "bump" nelle casse).Conclusioni:Se cercate un finale di potenza compatto, dal design fantastico (che si sposa benissimo con gli altri componenti Fosi), dotato di ingressi XLR bilanciati veri e con una qualità sonora che rivaleggia con amplificatori tradizionali dal costo triplo, lo ZA3 è un best-buy assoluto. Consigliatissimo!

This little Amp surprised me beyond my wildest dreams. I thought about buying this Fosi amp for several months thinking. Theres no way this little Amp well do all the things they claim it well. Well I've had this little Amp for only a week but the music quality coming through my 40 year old speakers is beyond awesome. It's like whoever your listening to are sitting in the room with you. Don't overthink it buy this little at this price and it well change your music listening. A+

48v 5A adaptörü takıp kendi dahili dac.ı rca ile denedim evet ilgi çekiciydi fakat standart bi d -classtı. Daha sonra 3 adet muses02 opamp sipariş verdim ve elime ulaşıncaya kadar amfinin yanmasını bekledim. Nihayet geldi opampları değiştirdim ve sub opampı devre dışı bıraktım(kullanmadığım için) vee Xlr (cardas golden cross) ları bağlayınca vaaay müthiş ses!!Birçok pahalı amfiyi sınıfta bırakır çok net!! Opamp yükseltmesi yapıp güzel bir Xlr ile kullanınız şaşırcaksınız....