Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply

I LOVE THIS!!! My older NAD C320BEE (a classic) bit the dust (caps) which I'm repairing, but I'm missing my music in the meantime; so I see this amp for so little money it doesn't matter. I also notice its specs, and rave reviews; so I've got to try it. It sounded good from the beginning, but not great. Older types of amps needed breaking in, so I played it; and I could almost hear it getting better. The mid-range still just wasn't present. Now it's been a week of playing it everyday and its sound is incredible, the mid-range is very present and involving, the voices sound real and in the room. I couldn't be happier. I also like that it's so small and powerful-it's amazing. I'm afraid to fix my NAD now- I don't want it to be better. I think because it's so inexpensive, it doesn't get played on the better speakers and users don't realize just how good it is. I have PSB Image 5Ts, another classic; and while not the best out there, they certainly punch above their class and the sound is incredible with detail galore! and huge soundstage. THD is '006%! It's amazing! You can't go wrong! Buy it.

I was replacing an older NAD integrated amp that I really liked. Decided to go class D amp for a replacement. WAY smaller. MUCH less expensive, and this unit has all the functionalities I was looking for at an incredible price (I bought mine for about $130 each on Amazon. Will be using two in mono mode. At first I thought they were defective. PAY ATTENTION TO THE MANUAL THAT WARNS YOU TO CONNECT ALL CABLING BEFORE YOU INSERT THE POWER CONNECTION. If you power the device first, then attach cables, it won't work at all until you detach the power cable and reinsert it. This is no fluke. It happened several times. Attach ALL cabling first, then insert the power connection. Secondly, if you're running it in mono mode the inputs for both units are inserted into the RIGHT side on the rear of the unit. The left channel is disabled in mono mode. This is all spelled out in the manual but it's counter-intuitive at first. As for sound, I'm pleased. I'm sending Tidal or Spotify digital signals to a Fosi ZD3 via bluetooth (works perfectly). The ZD3 is the DAC and connects to the paired Za3s. My speakers are very modest, a HSU powered sub that I've connected to the ZD3 (not the ZA3). Main speakers are HSU HB1 mk2. The ease of use with my iPhone is just fantastic. Essentially any song I want is at my fingertips. Sound quality is very good to my untrained ears. I'm very happy with this purchase. These amps have more than enough power to drive these smaller speakers even at higher volumes than I'd ever naturally want. The fit and finish of the amps is very good. No noise in the volume knob at all but I leave them in a fixed position adjusting volume either at the ZD3 "preamp" or even more commonly with my iPhone volume controls. I've been buying / building stereo equipment for about 55 years. I'm a huge music fan, but I can't hear all the mumbo-jumbo the experts can. I just know these are great little amps for an incredible price, and even one would work nicely in stereo mode. Very happy. Will see how they stand up to time and use.

After already using the device on stereo with Fosi's Bluetooth DAC and P3 preamp, I am now using two ZA3s on my Klipsch RP600 biamplified (separate whoofer and tweeter), and a powered 100W subwoofer and the sound that was already great became magnific! The HiDef sound from my computer goes through the DAC to receive the warmth of the P3 tubes, then gets amplified with tons of headroom into my RP600 delivering a highly impressive soundstage and crispy clarity and depth to the sounds. I am hearing details that were only noise before. Even on extremely low volumes at night, the level of detail is very impressive. Highly recommend to any one who wants to enter into HiDef and wants to buy quality, easy to install, and use devices while not breaking the bank! I just wish it came with the 10a power supply

I dove headfirst into the hi-fi realm at the beginning of the year and not knowing what to expect. I come from a studio set up with active monitors (Adam A7) hooked up to an Audient ID44 audio interface. For my small but amazing bachelor pad, I was actually using an Echo Dot hooked up to a small pair of Presonus Eris 3.5 speakers (Don’t Laugh). Obviously knowing what good sound sounds like, I wasn’t satisfied with that set up. I started looking up amplifiers, Dacs, and bookshelf speakers. Of course people swear by AB amplifiers as better sounding, but I wanted a minimal set up that sounded good without using up too much space. Not that I don’t mind spending more cash, but I also know that you reach a point of diminishing returns. Do I really want to spend an extra thousand dollars for a 5% increase in sound quality? Not me, at least not now. So I began my research. At the beginning of the year I purchased the Aiyima A07 Pro with of course the infamous Sony SSCS5 that everybody seems to have; thank the Cheap Audioman for that. I wasn’t using a DAC, I was streaming straight from my iPhone paired up with Bluetooth. I thought OK this is cool, I can live with this. But then I started binging on more YouTube videos and soon realized that I wanted more. Sound was cool but not great. I would say that the turning point came when I found out about the WiiM Pro streamer. You wanna talk about a life-changing product, that’s it! It literally changed the game for me. From streaming from my TV, tablet, phone, everything... Chromecast, Airplay, Spotify connect, Tidal. You name it! They put all of the pieces together for me and made everything seamless. After a bit more research, I came across the SMSL SU-1 DAC everybody was raving about. As for speakers, I purchased a pair of Polk XT15 to go along with my Sony's. I liked the Sony's, but they were lacking a bit in bass and chose the Polk XT15 because they were on sale on Amazon for $135 and were also significantly smaller than my Sony's while still having a 5“ driver and a better frequency response in my opinion. The highs were crystal clear yet non-fatiguing, and the bass punchier and hefty while the Sony's sounded more boomy in comparison. Beautiful speakers all around and definitely recommend them. Of course you know I didn't stop there though! I started late night binging on YouTube and foaming at the mouth thirsting for more and better gear. Upon yet more research, I realized that everybody was swearing about the new Fosi ZA3, so on launch day, I jumped all over it and purchased it. I swapped out my Aiyima A07, turned on the Fosi ZA3 and my first impression was warmth, wideness, punch. Now don’t get me wrong, the Aiyima A07 Pro is no slouch, and it has served me well throughout the year. I’m still keeping it and putting it in the master bedroom. I love the tone controls, the Bluetooth connectivity, but the Fosi definitely had the “IT” factor. Music was immersive, I started bopping my head, tapping my feet on the ground and busting the nickel in the living room (for those that know about break dancing). I felt it was definitely an upgrade. I also like that it has balanced XLR connections which sound better than RCA and louder. Here's my setup: • Polk XT 15 Bookshelf Speakers • Fosi ZA3 Amplifier • WiiM Pro (Not the Plus) • SMSL SU-1 DAC • Audioblast Speaker Cables • Mogami 2964 RCA Cables • Gotham GAC-1 Pro SPIDF Cable Could you get a better set up? Of course! But then again, do you really need it? The diminishing returns factor kicks in really quick. I mean, It’s easy to become addicted to buying gear. FOMO is REAL! I found that out this past year. New gear is always coming out at a feverish pace, on a monthly basis it seems. but seriously, just go with what you need and sit back roll a fat one, break out the wine, crack open a cold brew and just enjoy the music! With my current rig, I dropped $600 and I’m at the point where I’m happy with my set up. It’s more than good. It’s great. Could I drop an extra thousand dollars on a better DAC and amplifier? YES. Would people notice the difference? Absolutely not! With my current set up, I get compliments all the time. The music sounds amazing, and the ladies love it. Good luck on your journey and remember, diminishing returns!

Great little Chi-Fi amp. Plenty of power for a desktop system or a system for a small room. I am running this with their ZH3 DAC\headphone amp, The only complaint I have, which is very petty, is it would have cost them a few cents to include a trigger cable, other than that, it works well, I did replace the Opamps with some high end Virtual HiFi Supersonic V2's which makes this amp sound amazing.

Impressive little class D amplifier out of the box. Lots of power with low distortion and practically no noise. Very efficient due to class D operation. Construction seems nice with excellent components. I first bought one and used it in the stereo mode. I enjoyed it, but was intrigued by the swappable op amps. I bought two Sparkos Labs SS3602 op amps and installed them for the RCA inputs. While the amp is very good out of the box the difference with the Sparkos is amazing. Separation, detail, space depth, imaging and frequency response all improved dramatically. This is a killer combination. Later bought a second one, did the same easy mod and am running them in dual mono block mode making an awesome combination. As I said, these are very nice out of the box, but with the mods and in the mono block mode they make a great system.

Great little amp. My stack is a Wiim amp pro (for streaming and eq), Fosi ZD3 preamp, and Fosi ZA3 with the 48v power supply running in stereo mode. Mostly run from an apple tv sending hdmi to the tv then optical from there. The whole setup was easily under $500. I chose this setup in case I needed more power, I can simply add another amp and run mono, but it's definitely not needed. Runs a pair of Q Accoustic 5020s easily to unlistenable levels in a small/med size room (450sq/ft). I have the whole stack switched with a smart plug and haven't had any issues with powering off or on (unlike my last set of powered Swans speakers which blew up on power up). I was occasionally getting a little pop on power up and also a computerized "bzzzrt" very occasionally during listening. I just googled and found there was a firmware update for the Preamp (no issue with the amp). Just contact Fosi support and they give you the url for the updated firmware. Easy to install with a windows laptop and usb cord. Haven't had either issue since. Really nice to see firmware updates so quickly! So used to products this cheap being treated as "disposable" and not getting real support. I'm very happy with the performance and the support. I think it really helps that there seems to be a lot of love in the stereo community for this and other Fosi products. I hope it continues to get firmware updates in the future. The set looks really clean and very minimal. Used to do the whole rack or shelf system of components, but I'm over it. Most recently, I was using a set of powered speakers because I like not seeing the electronics. But when those failed you basically throw the whole thing away. I eventually had them fixed, but I don't like the idea of a failure being a total loss. So now I like having small separate pieces. I absolutely love the size. Even though the Fosi set looks very nice, I now have my entire multimedia set up hidden behind a small chest and subwoofer as shown in the last picture (please ignore my weird music choice). There is one downer on this product. It has a sub out which is great. But when you connect a subwoofer, it still sends full signal to the speaker outs. At high volumes you can hear the small bookshelf speakers trying to put out bass that's not really needed with a sub. Edit: I forgot my SVS subwoofer has a high pass eq! So now I have the preamp go into the subwoofer and pass through to the amp. The sub out should really be on the preamp not the amp. Weird choice.

I bought this unit for my desktop audio system. I wanted an amp that wouldn't take up much space on my desk and have enough power to drive my desktop speakers with ease. While the Fosi amp fulfilled these criteria, it has shortcomings: -- the volume knob is flimsy and feels cheap. This is subjective, of course, and doesn't affect the sound. -- related to the above, the on/off switch is integrated with the volume control. I would much prefer a separate, more robust switch. -- the speaker binding posts also are flimsy and cheap. If using bare speaker wire, I suspect they could easily be overtorqued and its threads stripped. -- the two switches on the front panel would be used by most people only once. They would be better placed on the back panel. -- the balanced (XLR) inputs on the back panel strike me as a gimmick. They're most often found on high-end equipment. (Sorry, Fosi: this is not an audiophile piece.) I'm sure the RCA inputs are used by the vast majority of Fosi owners. -- the 'on' light on the front of the unit is small and relatively faint. Yes, this is a nit, but it is easy to overlook it, resulting in leaving the unit on unintentionally. -- as a desktop unit, I wish it had an auto-on/off function, where it would go into sleep mode following a period of non-use and automatically power up when an audio signal is detected. -- I would have liked it to have a headphone input on the front panel. Now, for the positive: -- it lacks a remote. Yes, this a positive-- as a desktop unit, I'd much rather control volume and on/off on the unit itself rather than have to fumble for a remote to control those functions. I am happy to avoid having to pay for a remote control. -- it lacks an onboard DAC, also a positive. I have several outboard DACs so I am happy to avoid paying a higher price for a unit with an onboard DAC. -- the housing of the unit is solid and belies the relative flimsiness of the volume knob and the speaker binding posts. -- the unit appears to be well ventilated, Although I have not driven it hard or for hours on end, it has run cool. -- it drives my desktop speakers to more than adequate volume levels. Final thoughts: At a hundred-fifty bucks, this amp is a good value. I recommend it to anyone seeking an amp for a desktop system and who doesn't want/need a headphone output or a remote. Above all, I want the unit to be reliable. As for this, time will tell.

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....