--- product_id: 725110695 title: "Fosi Audio ZA3 Compact TPA3255 Balanced Stereo Amplifier, Home Audio, Mini 2-Channel Monaural Amplifier, Home Theater, Compatible with XLR/TRS/RCA Inputs, Trigger Terminal, For Subwoofer/Passive" brand: "fosi audio" price: "VT78208" currency: VUV in_stock: true reviews_count: 13 category: "Fosi Audio" url: https://www.desertcart.vu/products/725110695-fosi-audio-za3-compact-tpa3255-balanced-stereo-amplifier-home-audio store_origin: VU region: Vanuatu --- # 180W stereo / 235W mono power XLR/TRS/RCA balanced inputs Advanced side-vent heat dissipation Fosi Audio ZA3 Compact TPA3255 Balanced Stereo Amplifier, Home Audio, Mini 2-Channel Monaural Amplifier, Home Theater, Compatible with XLR/TRS/RCA Inputs, Trigger Terminal, For Subwoofer/Passive **Brand:** fosi audio **Price:** VT78208 **Availability:** ✅ In Stock ## Summary > 🎶 Elevate your sound game — compact power, pro clarity, zero compromise! ## Quick Answers - **What is this?** Fosi Audio ZA3 Compact TPA3255 Balanced Stereo Amplifier, Home Audio, Mini 2-Channel Monaural Amplifier, Home Theater, Compatible with XLR/TRS/RCA Inputs, Trigger Terminal, For Subwoofer/Passive by fosi audio - **How much does it cost?** VT78208 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/725110695-fosi-audio-za3-compact-tpa3255-balanced-stereo-amplifier-home-audio) ## 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 - • **Customizable Sound Tuning:** Swap op-amps to personalize your audio signature and optimize subwoofer performance effortlessly. - • **Next-Level Cooling Design:** Side vents and dust cover ensure stable high output without overheating during marathon listening sessions. - • **Audiophile-Grade Components:** Premium Japanese and German capacitors plus TPA3255 chip deliver crystal-clear, low-distortion audio. - • **Dual Mode Power Flexibility:** Switch seamlessly between 180W stereo and 235W mono for tailored sound impact. - • **Pro-Grade Balanced Connectivity:** Minimize noise with XLR/TRS combo inputs and 12V trigger for smart system integration. ## Overview The Fosi Audio ZA3 is a compact, high-performance stereo amplifier featuring dual stereo/mono modes with up to 235W output, balanced XLR/TRS/RCA inputs for ultra-low noise, and a cutting-edge heat dissipation system. Built with premium international components and customizable op-amps, it’s designed for audiophiles and home theater enthusiasts seeking powerful, clean sound in a sleek, space-saving chassis. ## Description desertcart.co.jp: Fosi Audio ZA3 Compact TPA3255 Balanced Stereo Amplifier, Home Audio, Mini 2-Channel Monaural Amplifier, Home Theater, Compatible with XLR/TRS/RCA Inputs, Trigger Terminal, For Subwoofer/Passive : Electronics Review: オーディオ花盛りの頃の国産アンプの佇まいは無いが、不要なものを削ぎ落としたデザインには好感が持てる。脚色のないニュートラルなサウンドもデザインと合っている。往年のデカいスピーカーに繋いで一日中サブスク音楽を楽しんでいるが、発熱も感じられず、長持ちしそうである。ストリーマーアプリで自由に音質調整できるので、ハード側に仕掛けは不要だ。手持ちの旧式スピーカーにこのアンプを追加して、アクティブスピーカーに変えるという発想も有りだと思う。 Review: Very good quality, very powerful! To be used with good speakers. - Excellent amplifier! Very powerful! I use the volume at its very low and the sound is amazing. I am using a set of Yamaha piano black speakers. Excellent combination! Good amp that fits in a very small space. ## Features - 【Dual Mode Innovation】This new generation mini amplifier offers both stereo mode and mono mode, flexibly adapting to diverse needs and allowing seamless mode switching In stereo mode, it provides a robust output of up to 180W, but in mono mode, it can go up to 235W Pairing two ZA3 units in a mono configuration creates a powerful audio system that greatly enhances the listening experience - 【More Connectivity】The ZA3, an audio amplifier with balanced input and trigger input, features a balanced combo audio signal input connector that supports both XLR and 1/4 inch TRS plugs This design minimizes interference and reduces the noise floor Synchronization is possible with the 12V trigger input connector Integrate with other devices to streamline the power on/off process without the need for individual operations - 【High Quality Components】The ZA3 features a TPA3255 high-end class-D amplifier chip, utilizing premium Japanese-made NCC, ELNA, German-made WIMA capacitors, and Japanese-made Sumida inductors to achieve exceptional audio quality With a maximum SNR of 106dB and a low noise floor of just 150μV, it delivers exceptional clarity and low distortion - 【Innovative Heat Dissipation Design】Based on the groundbreaking heat dissipation design of the V3, we have upgraded the ZA3 cooling system by enlarging the chassis, moving the vents to the sides, adding a dust cover to improve ventilation, and achieving sustained and stable high output - 【Scalable Enjoyment】Customize your audio experience with the op-amp rolling function! The ZA3 features five interchangeable operational amplifiers for left and right channel output, balanced input, and subwoofer output Try compatible DIP8 dual op-amps like Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA to fine-tune your sound perfectly - Please note: 1) The power switch of this product is located on the master volume knob Press and hold the master volume knob for 2 seconds to turn it on 2) When connecting, make sure that the cable plugs match the interface and that the plugs are inserted into their designated positions Check the cables for possible damage and replace them 3) Before using this product, please confirm that the power of the speakers matches the product 4) When you use it, you can turn off the Bluetooth function of other Bluetooth devices to reduce the signal interference 5) Confirm whether the audio source is output normally and whether the speakers are working properly - Why does a small spark occur when wiring? This is a normal phenomenon Here's why: ① Current change: When the power amplifier is operating, a constant current flows through its output terminals When the speaker comes into contact with the output port of the power amplifier, the circuit changes from an open circuit to a closed circuit The current rises rapidly from zero to a stable value Due to this sudden change in current, a high voltage is momentarily generated, causing a spark. ② Capacitor discharge: Typically, within a power amplifier, there are energy storage components such as filter capacitors. Even after the power amplifier is turned off, these capacitors may still have a certain amount of charge stored When the speaker is connected, the capacitor discharges through the speaker, forming an instantaneous current pulse and creating a spark - Is it possible to adjust treble and bass in RCA/XLR output mode? Not supported Only the headphone output mode (PO) supports adjustments for treble and bass When users want to add bass while using speakers, it is typically assumed that they will connect a dedicated subwoofer Furthermore, since adding the high/low tone adjustment function may slightly increase noise, this feature is not included in the RCA/XLR outputs - ※ For better heat dissipation, it is recommended to use Fosi Audio cooling fans with the amplifier ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CLP4T5L7 | | Amazon Bestseller | #14,975 in Electronics ( See Top 100 in Electronics ) #16 in Audio Component Power Amplifiers | | Brand Name | Fosi Audio | | Country Of Origin | China | | Customer Reviews | 4.5 4.5 out of 5 stars (1,124) | | Included Components | Instructions, Power Adapter | | Item Dimensions | 15.5 x 18.4 x 5.1 cm | | Item Weight | 1.2 Kilograms | | Manufacturer | China | | Material Type | Aluminum Alloy | | Maximum Supply Voltage | 48 Volts | | Minimum Supply Voltage | 48 Volts | | Model | ZA3 | | Number of Channels | 2 | | Part Number | ZA3 | | Voltage | 48 Volts | | Warranty Description | 2 years | ## Product Details - **Item dimensions L x W x H:** 15.5 x 18.4 x 5.1 cm - **Manufacturer:** China - **Maximum Supply Voltage:** 48 Volts - **Minimum Supply Voltage:** 48 Volts - **Voltage:** 48 Volts ## Images ![Fosi Audio ZA3 Compact TPA3255 Balanced Stereo Amplifier, Home Audio, Mini 2-Channel Monaural Amplifier, Home Theater, Compatible with XLR/TRS/RCA Inputs, Trigger Terminal, For Subwoofer/Passive - 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 ### ⭐⭐⭐⭐⭐ Review *by A***様 on March 3, 2026* オーディオ花盛りの頃の国産アンプの佇まいは無いが、不要なものを削ぎ落としたデザインには好感が持てる。脚色のないニュートラルなサウンドもデザインと合っている。往年のデカいスピーカーに繋いで一日中サブスク音楽を楽しんでいるが、発熱も感じられず、長持ちしそうである。ストリーマーアプリで自由に音質調整できるので、ハード側に仕掛けは不要だ。手持ちの旧式スピーカーにこのアンプを追加して、アクティブスピーカーに変えるという発想も有りだと思う。 ### ⭐⭐⭐⭐⭐ Very good quality, very powerful! To be used with good speakers. *by F***O on November 12, 2025* Excellent amplifier! Very powerful! I use the volume at its very low and the sound is amazing. I am using a set of Yamaha piano black speakers. Excellent combination! Good amp that fits in a very small space. ### ⭐⭐⭐⭐⭐ Review *by 背***キ on January 10, 2026* AIYIMA A80を使ってみて中華アンプに興味が湧き、安価に（昔と比べて） 色々できるようになったので昔できなかったことをしてみました。 プリにZH3、パワーにZA３を２台とし（V3monoと迷って、こちらが実績があったので） ①まずはモノラルモードで垂直バイアンプ（USBーXLRーバイワイヤケーブル2-4使用） ②XLR分岐ケーブル×２を追加購入し、ZA３をステレオモードで垂直バイアンプ （スピーカーケーブル２本×２も別途購入） ③②を水平バイアンプ ④ZA３を単体でステレオ運用（プリZH3）バイワイヤ2-4使用 10万円前後で上記を試すことができて楽しかったです。（スピーカー除く）音源はPC まず、USB接続での頭音切れは①～④ともありませんでした。 発熱もA80に比べたら南極と北極程違います（意味不明） 音の分離感は②が圧倒的。①でも分離感は十分楽しめました。が、低音が出すぎてこもっている感が・・・ 逆に分離感と高低音の音のバランスは③が一番で、音質の好みも③が一番でした。 ④は③の劣化版（悪い意味でなく、これで十分かもの意）という感じです。 あとは、ZA3４台でマルチアンプをやるかどうかですが、これ以上の出費も痛いので しばらく①～④で（配線変えるの大変ですが）楽しんでみます。 ちなみにスピーカーはB&W607S3、SWにポークPSW-10。 ケーブルにBELDEN 1503Aを２本とCANARE 4S6G を２本使用。 バイワイヤケーブルはWYVERN AUDIO 【WVA-04BW12】を5年間使ってますが、音はいいのですが太くて硬いので取り回しに苦労するかもなので、別々に２本ちょい細目をそろえたほうがよさげです。 まあ、バイアンプとかバイワイヤリングは効果なし等のご意見がありますが、何事もやってみるのが楽しいかと思います。 2026.2.16追記 ZH3のUSBではやはり皆様がおっしゃっている通り曲の頭飛びが起きました。32bit384Khzです。 しかも、高域になにやら雑音のようなものが聞こえ、気になりだしたらどうにも我慢できず 以前使っていたFX-D03Jを介して同軸で繋げてみましたら、全体的に落ち着いた奇麗な音になりました。24bit96khz で、ここが肝心なのですが水平バイアンプの恩恵として、高域ボリューム最大・低域ボリューム３時の位置あたりで ドンピシャな音になりました。個人の感想ですが、サンプリングレート高ければいいとは限らないと思いました。 SWのボリュームも３時あたりまで上げてもいい感じに低音出てます。引き続きいい音探し頑張ってみます。 高域と低域のボリュームを別々に調整できるので、水平バイアンプにした甲斐がありました。 ## 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.vu/products/725110695-fosi-audio-za3-compact-tpa3255-balanced-stereo-amplifier-home-audio](https://www.desertcart.vu/products/725110695-fosi-audio-za3-compact-tpa3255-balanced-stereo-amplifier-home-audio) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-06*