--- 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: "$459.32" currency: USD in_stock: true category: "Fosi Audio" url: https://www.desertcart.us/products/593574160-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255-chips-mini store_origin: US region: United States of America --- # 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:** $459.32 **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?** $459.32 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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. ## 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 | 7,940 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 21 in Hi-Fi Amplifiers | | Brand | Fosi Audio | | Country Of Origin | China | | Customer Reviews | 4.6 4.6 out of 5 stars (1,130) | | Item Dimensions | 15.5 x 18.4 x 5.1 centimetres | | Item Weight | 1.2 Kilograms | | 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. ## 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.us/products/593574160-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255-chips-mini](https://www.desertcart.us/products/593574160-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255-chips-mini) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-12*