--- product_id: 638606333 title: "A50 PRO HiFi Power Amplifier, High/Low Pass F, 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control" brand: "s.m.s.l" price: "¥45504" currency: JPY in_stock: true reviews_count: 13 category: "S.M.S.L" url: https://www.desertcart.jp/products/638606333-a50-pro-hifi-power-amplifier-high-low-pass-f-2 store_origin: JP region: Japan --- # 100W passive subwoofer power Bluetooth 5.0 + USB-C + HDMI ARC + Optical + AUX 10-point adjustable high/low pass filters A50 PRO HiFi Power Amplifier, High/Low Pass F, 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control **Brand:** s.m.s.l **Price:** ¥45504 **Availability:** ✅ In Stock ## Summary > 🎵 Elevate your audio game with precision power and seamless style! ## Quick Answers - **What is this?** A50 PRO HiFi Power Amplifier, High/Low Pass F, 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control by s.m.s.l - **How much does it cost?** ¥45504 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/638606333-a50-pro-hifi-power-amplifier-high-low-pass-f-2) ## Best For - s.m.s.l enthusiasts ## Why This Product - Trusted s.m.s.l brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact Powerhouse:** Delivers rich, room-filling audio in a sleek, freestanding design backed by a 12-month warranty. - • **Seamless Connectivity:** Plug and play with Bluetooth 5.0, USB-C driver-free, HDMI ARC, optical, and AUX inputs for ultimate versatility. - • **Precision Bass Control:** Fine-tune your subwoofer volume independently for a perfectly balanced 2.1 soundstage. - • **Customizable Sound Profiles:** Multiple EQ presets plus ±9 bass and treble adjustments to match every music vibe. - • **Intuitive Digital Interface:** Single rotary encoder with a clear 3-digit display makes tweaking your sound effortless and precise. ## Overview The A50 PRO HiFi Power Amplifier is a compact, high-performance 2.1-channel digital amp featuring Infineon's MA12070P chip. It offers 100W passive subwoofer output with independently adjustable volume and 10-point high/low pass filters. Equipped with Bluetooth 5.0, USB-C, HDMI ARC, optical, and AUX inputs, it supports diverse audio sources effortlessly. Multiple EQ presets and bass/treble controls provide customizable sound profiles, all managed via an intuitive rotary encoder and digital display. Ideal for professionals seeking versatile, high-fidelity sound with modern connectivity and a sleek design. ## Description Product Description Review: A rare quality 2.1 amp with a passive sub output - I needed this. - Very well constructed for the price and compact as well, I was using a digital amp with analogue controls, this amp is digital all the way with the very intuitive single rotary encoder knob and the three digit display. Once you get to know the different display menu modes, tweaking with just the front knob is a breeze. The various eq modes, bass, treble, tone presents, high and low pass filters and subwoofer volume are quite subtle to my recollection but it's well worth spending a bit of time tweaking them to your tastes as the amp has virtually no problems filling my listening room with a very balanced 3d stereo image soundstage whether using the excellent bluetooth receiver or the optical in. I have very little use for the usb dac in, 3.5mm jack in and the HDMI ARC, I have a 200 cd changer, media streamer and a linear tracking turntable connected to an Arylic BP50 preamp feeding the S.M.S.L. via an optical cable . Then out of the stereo L & R and subwoofer outputs to a pair of Wharfedale Modus Cubes and a matching pair of Mission 73ps passive subwoofers. The remote control is a nice addition and it seems to work well but my room is so small I can just reach over to the amp and use the rotary controller. I bought this amp because it had a passive sub output and an optical in - these and everything else works flawlessly - a great little modern amp for a bargain price. Review: Great value. - Excellent little amp . Amazed at the quality for the money . Have it connected to a Cambridge streamer with great results. Highly recommended. ## Features - Getting ten crossover frequency points adjustable for High-pass and low-pass each. Subwoofer's volume can set it separetely,which perfectly can use well for different main speaker and passive subwoofer and build your real 2.1 speaker system. - Passive subwoofer with adjustable volume and high power: The A50 Pro provides 100 watts of passive bass output power. lt effortlessly handles various speakers and scenarios, allowing you to adjust the subwoofer volume from S00 to S99 as desired. - Multiple EQ presets：This digital amplifier features multiple EQ presets, allowing it to adapt to various music styles and provide a diverse listening experience. Additionally, it has bass and treble adjustments, with a customizable range of ±9 levels. - Higher versatility Supports multiple devices：USB-Cport supports driver-free use.HDMl (ARC) is compatible with most televisions and also equipped with optical input and AUXinput. it's suitable for almost all audio connections. - 12-month warranty, you can return the item or replace a new one if you have any problems. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0D1G7R489 | | Best Sellers Rank | 11,568 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 14 in AV Receivers & Amplifiers | | Brand | S.M.S.L | | Country Of Origin | China | | Customer Reviews | 4.2 out of 5 stars 299 Reviews | | Global Trade Identification Number | 06976935810226 | | Included Components | remote control | | Manufacturer | S.M.S.L | | Manufacturer Part Number | A50 | | Model Number | A50 PRO | | Mounting Type | freestanding | | Mounting type | freestanding | | Number of Channels | 2 | | Number of channels | 2 | | Output Power | 100 Watts | | Output power | 100 Watts | | Package Type Name | box | | Specification Met | Hifi | | Voltage | 24 Volts | ## Product Details - **Brand:** S.M.S.L - **Manufacturer:** S.M.S.L - **Mounting type:** freestanding - **Number of channels:** 2 - **Voltage:** 24 Volts ## Images ![A50 PRO HiFi Power Amplifier, High/Low Pass F, 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control - Image 1](https://m.media-amazon.com/images/I/61r5x4MRIUL.jpg) ![A50 PRO HiFi Power Amplifier, High/Low Pass F, 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control - Image 2](https://m.media-amazon.com/images/I/61QaqYd3g2L.jpg) ![A50 PRO HiFi Power Amplifier, High/Low Pass F, 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control - Image 3](https://m.media-amazon.com/images/I/71SlRX40lKL.jpg) ![A50 PRO HiFi Power Amplifier, High/Low Pass F, 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control - Image 4](https://m.media-amazon.com/images/I/71QXmf719QL.jpg) ![A50 PRO HiFi Power Amplifier, High/Low Pass F, 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control - Image 5](https://m.media-amazon.com/images/I/71u6XCILUoL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ A rare quality 2.1 amp with a passive sub output - I needed this. *by K***J on 3 December 2025* Very well constructed for the price and compact as well, I was using a digital amp with analogue controls, this amp is digital all the way with the very intuitive single rotary encoder knob and the three digit display. Once you get to know the different display menu modes, tweaking with just the front knob is a breeze. The various eq modes, bass, treble, tone presents, high and low pass filters and subwoofer volume are quite subtle to my recollection but it's well worth spending a bit of time tweaking them to your tastes as the amp has virtually no problems filling my listening room with a very balanced 3d stereo image soundstage whether using the excellent bluetooth receiver or the optical in. I have very little use for the usb dac in, 3.5mm jack in and the HDMI ARC, I have a 200 cd changer, media streamer and a linear tracking turntable connected to an Arylic BP50 preamp feeding the S.M.S.L. via an optical cable . Then out of the stereo L & R and subwoofer outputs to a pair of Wharfedale Modus Cubes and a matching pair of Mission 73ps passive subwoofers. The remote control is a nice addition and it seems to work well but my room is so small I can just reach over to the amp and use the rotary controller. I bought this amp because it had a passive sub output and an optical in - these and everything else works flawlessly - a great little modern amp for a bargain price. ### ⭐⭐⭐⭐⭐ Great value. *by G***R on 20 June 2026* Excellent little amp . Amazed at the quality for the money . Have it connected to a Cambridge streamer with great results. Highly recommended. ### ⭐⭐⭐⭐ Causes interference on the UK amateur radio HF frequencies. *by S***Y on 14 January 2026* I bought this for a present for my husband so this is his review. For it's price this DAC amplifier is very good. I replaced a massive Onkyo TN414 AV amplifier with this teeny device. The sound quality is very good and plenty loud enough. The remote control is a bit slow. The number of inputs is excellent for the price. I do however have one issue that would not affect most users. I am an amateur radio operator (HAM) and this DAC produces severe RF interference across most of the bands from the speaker cables. It should adhere to UK interference compliance but quite obviously doesn't. I have emailed S.M.S.L but have not yet received a reply. ## Frequently Bought Together - S.M.S.L A50 PRO HiFi Power Amplifier, High/Low pass filter 2.1-Channel, Infineon's MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control - FosPower Banana Plugs 2 Pairs / 4 pcs, Closed Screw 24K Gold Plated Banana Speaker Plug Connectors for Speaker Wire, Wall Plate, Home Theater, Audio/Video Receiver, Amplifiers and Sound Systems - Amazon Basics Speaker Cable, Easy Assembly, 16-Gauge, Bronze, 100 ft --- ## 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.jp/products/638606333-a50-pro-hifi-power-amplifier-high-low-pass-f-2](https://www.desertcart.jp/products/638606333-a50-pro-hifi-power-amplifier-high-low-pass-f-2) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-07-18*