--- product_id: 593574160 title: "– 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" brand: "fosi audio" price: "€ 376.56" currency: EUR in_stock: true reviews_count: 8 category: "Fosi Audio" url: https://www.desertcart.hr/products/593574160-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255-chips-mini store_origin: HR region: Croatia --- # 235W max mono power Balanced XLR/TRS inputs Advanced heat dissipation – 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 **Brand:** fosi audio **Price:** € 376.56 **Availability:** ✅ In Stock ## Summary > 🎧 Elevate your desktop audio game with power, precision, and pro-level polish. ## Quick Answers - **What is this?** – 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 by fosi audio - **How much does it cost?** € 376.56 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/593574160-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255-chips-mini) ## Best For - fosi audio enthusiasts ## Why This Product - Trusted fosi audio brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual-Mode Powerhouse:** Switch effortlessly between 180W stereo and 235W mono modes to match your audio ambitions. - • **Seamless System Sync:** 12V trigger-in lets your entire setup power on/off in perfect harmony—no extra hassle. - • **Custom Sound Sculpting:** Swap out op-amps to tailor your audio signature—because your sound should be as unique as you are. - • **Pro-Grade Balanced Inputs:** XLR and 1/4" TRS combo inputs slash noise and interference for crystal-clear sound. - • **Audiophile-Approved Components:** Premium TPA3255 Class-D chips with Japanese and German capacitors deliver pristine clarity and ultra-low distortion. ## Overview The Fosi Audio ZA3 is a compact, high-performance Class-D amplifier delivering up to 180W in stereo and 235W in mono. Featuring balanced XLR/TRS inputs, a 12V trigger for synchronized control, and premium audiophile components, it offers exceptional clarity, low noise, and flexible customization through swappable op-amps. Its advanced cooling design ensures stable, sustained power output, making it a top-tier choice for desktop and bookshelf passive speaker setups. ## Description This compact amp delivers up to 180W stereo or 235W mono, with balanced XLR/TRS inputs and 12V trigger for seamless integration with your audio setup. Review: Breakthrough products with balanced XLR inputs and dual amplifier chips. - 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. Review: Awesome pieces of Kit - 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 Fosi A 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. ## Features - Dual-Mode Innovation: This new generation mini amplifier offers both stereo and mono modes, adapts flexibly to your diverse needs, allowing seamless mode switching. In stereo mode, it delivers a robust output of up to 180W@4Ω, while in mono mode, the power soars to a maximum of 235W@4Ω. Pair two ZA3 units in mono configuration to create a powerful audio system, significantly enhancing your listening experience. (The output power varies when connecting speakers with different impedances; please refer to the actual specifications.) - Richer Connectivity: Debut amplifier with balanced input and trigger in, the ZA3 features a balanced combo audio signal input connector supporting both XLR and 1/4" TRS plugs. This design minimizes interference and reduces noise floor. The 12V trigger-in connector enables synchronization with other devices, streamlining the process of turning on/off without individual operations. - Audiophile-Grade Components: The ZA3 features the TPA3255 high-end Class-D amp chip and utilizes premium Japanese NCC, ELNA, and German WIMA capacitors, and Japanese Sumida inductors for exceptional audio quality. With a SINAD rating of up to 89dB, an SNR of up to 106dB, and a low noise floor of only 150μV, it delivers exceptional clarity and low distortion. - Advanced Heat Dissipation: Based on V3's groundbreaking heat dissipation design, we upgraded ZA3's cooling system by featuring a larger chassis, moving vents to the sides, and adding dust covers to achieve better ventilation for a sustained and stable high power output. - Enhanced Scalable Fun: Personalize your audio experience with the op-amp rolling feature! The ZA3 stocks five swappable op-amps for left and right channel outputs, balanced input, and subwoofer output. Experiment with compatible DIP8 dual op-amps such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA, etc. to fine-tune your sound to perfection. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CLP4T5L7 | | Best Sellers Rank | 9,140 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 24 in Hi-Fi Amplifiers | | Brand | Fosi Audio | | Country Of Origin | China | | Customer Reviews | 4.6 4.6 out of 5 stars (1,155) | | Item Dimensions | 15.5 x 18.4 x 5.1 centimetres | | Manufacturer | Fosi Audio | | Manufacturer Part Number | ZA3 | | Material | metal | | Maximum Output Power | 235W | | Maximum Supply Voltage | 48 Volts (DC) | | Minimum Supply Voltage | 230 Volts | | Model Number | ZA3 | | Mounting Type | Surface Mount | | Number of Channels | 2 | | Output Power | 235 Watts | | Package Type Name | Cardboard | | Product Warranty | 2 years | | Specification Met | RoHS | | Supply Current | 230 Milliamps | | Unit Count | 1.0 count | | Voltage | 48 Volts | ## Product Details - **Item dimensions L x W x H:** 15.5 x 18.4 x 5.1 centimetres - **Manufacturer:** Fosi Audio - **Maximum supply voltage:** 48 Volts (DC) - **Minimum supply voltage:** 230 Volts - **Voltage:** 48 Volts ## Images ![– 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 - Image 1](https://m.media-amazon.com/images/I/51XgZUlMEQL.jpg) ## Questions & Answers **Q: Is it possible to use the trigger out from the Fosi Audio ZD3 to two pieces of ZA3 amplifiers?** A: Yes, use a dual 3.5mm male splitter cable to trigger the ZA3 to switch on synchronously. **Q: How to set up a system using two ZA3 units in mono mode?** A: - Connect the RCA (XLR) cables to the right-channel RCA (XLR) input ports of the two ZA3 units, and link the speaker wires to the right-channel binding posts. **Q: ZA3 recommendations for replacing op-amps in mono mode?** A: If you're using RCA mode, please replace only the right op-amp. For XLR mode, swap the right and XLR channel op-amps. **Q: No front light on ZA3 though there is light on the ac adapter.** A: Long press the volume button for 2 seconds to power it on. **Q: The power on LED light on my ZA3 is dead.** A: Check if the LED is misaligned with the front panel hole, especially if the op-amp was recently changed. Misalignment could cause the LED not to be visible through the case. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Breakthrough products with balanced XLR inputs and dual amplifier chips. *by A***R on 26 November 2024* 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. ### ⭐⭐⭐⭐⭐ Awesome pieces of Kit *by G***O on 16 March 2026* 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 Fosi A 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. ### ⭐⭐⭐⭐⭐ A Great Amplifier that can extend your Hi-Fi hobby *by M***T on 13 August 2025* 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. ## Frequently Bought Together - 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 - VANDESAIL XLR Cables, 3ft 2 Pack Microphone Cable, XLR Male to Female Balanced Microphone Cord 3 pin, 3 Foot Short mic Cord Oxygen-Free Copper (OFC) Nylon Braided --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/593574160-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255-chips-mini](https://www.desertcart.hr/products/593574160-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255-chips-mini) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-16*