--- product_id: 58115674 title: "M04" brand: "fosi audio" price: "€ 118.80" currency: EUR in_stock: true category: "Fosi Audio" url: https://www.desertcart.be/products/58115674-m04 store_origin: BE region: Belgium --- # 100W output power Cool-running Class D tech Bass/full-frequency mode switch M04 **Brand:** fosi audio **Price:** € 118.80 **Availability:** ✅ In Stock ## Summary > 🎵 Unleash the bass beast in your home theater! ## Quick Answers - **What is this?** M04 by fosi audio - **How much does it cost?** € 118.80 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/58115674-m04) ## 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 - • **Powerful 100W Output:** Drive your subwoofer with clean, punchy bass that fills the room. - • **Dual Mode Bass Control:** Switch effortlessly between subwoofer and full-frequency modes for tailored sound. - • **Compact & Robust Design:** Fits seamlessly into any setup without overheating or bulk. - • **Plug & Play Convenience:** Complete package with power supply and manual for quick, hassle-free setup. - • **Crystal-Clear Low Frequencies:** Experience deep, distortion-free bass thanks to premium TI and NE5532 chips. ## Overview The Fosi Audio M04 is a compact, high-performance mono subwoofer amplifier delivering 100 watts of clean power via advanced Class D technology. Featuring a versatile bass/full-frequency mode switch and premium TI TPA3116 and NE5532 components, it enhances low-frequency sound with precision and clarity. Designed for passive subwoofers, it offers a robust yet space-saving build with an included power supply and user manual, making it an ideal upgrade for any home audio system. ## Description Buy Fosi Audio M04 Subwoofer Amplifier for Home Theater Mono Channel Digital Class D Integrated Power Amp for Passive Speakers Subwoofer: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## Features - High-Performance Mono Amplifier:The Fosi Audio M04 is a mono amplifier designed for driving passive subwoofers or speakers. It features the Texas Instruments TPA3116 chip and NE5532 op-amp, providing an output power of 100 watts for a 2-ohm subwoofer or speaker. - Enhanced Bass Response:The M04 SUB amp is designed to improve the bass response of passive subwoofers. It features a selector switch that allows the user to switch between subwoofer bass amplifier and full-frequency mono amplifier modes. - Compact and Robust Design:This mini amp has a small and robust design with a built-in low pass filter for subwoofers and a sub frequency control, making it practical and powerful. It uses highly efficient Class D technology that remains cool under demanding loads and doesn't take up much space. - Superior Sound Quality:The home subwoofer amplifier can produce a deep, crisp, and clean low-frequency sound effect, making it an excellent addition to dedicated home audio receivers & amplifiers. It has been designed to enhance the sound and performance of your audio system at an affordable price. - Complete Package:What You Get: M04 subwoofer amp x1, 19V/4.74A power supply x1, user manual x1. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07942M4MC | | Best Sellers Rank | #16,595 in Electronics ( See Top 100 in Electronics ) #72 in Audio Component Amplifiers | | Brand Name | Fosi Audio | | Customer Reviews | 4.4 4.4 out of 5 stars (548) | | Included Components | Fosi Audio M04 | | Item Dimensions | 5.2 x 3.5 x 1.4 inches | | Item Weight | 450 g | | Manufacturer | Fosi Audio | | Maximum Output Power | 100 watts | | Maximum Supply Voltage | 19 volts_of_direct_current | | Minimum Supply Voltage | 19 volts_of_direct_current | | Model | M04 | | Mounting Type | Freestanding | | Number of Channels | 1 | | Number of Items | 1 | | Output Power | 100 watts | | Part Number | M04 | | Specification Met | [Inf] Thd <= 0.04% and Frequency Range 20hz - 120hz | | Unit Count | 1 Count | | Voltage | 12 volts_of_direct_current | | Warranty Description | 18-month manufacturer | ## Product Details - **Item dimensions L x W x H:** 5.2 x 3.5 x 1.4 inches - **Manufacturer:** Fosi Audio - **Maximum Supply Voltage:** 19 volts_of_direct_current - **Minimum Supply Voltage:** 19 volts_of_direct_current - **Voltage:** 12 volts_of_direct_current ## Images ![M04 - Image 1](https://m.media-amazon.com/images/I/51ghuLx4kZL.jpg) ## Questions & Answers **Q: Will this power up passive subwoofers ?** A: Yes, absolutely. That's the reason I bought it and it works just fine without spending a whole lot of money. **Q: How hot does this amp run? The unit I currently use is very hot to the touch even after a short while.** A: This thing seems cool no issues **Q: What is the input voltage range?** A: Not sure what your question is about. If you mean input power, it's spec'd. at 12-24 vdc. It comes with a power brick rated at 19 vdc, 4.47 amps. Input sensitivity is =< 280 mv... **Q: I have a Harman Kardon reciver with a single rca sub connection. What cables do i need to hook my sub to this amp and the amp to my reciever** A: You need 1/8 audio plug to RCA adapter .. ## Frequently Bought Together - Fosi Audio M04 Subwoofer Amplifier for Home Theater Mono Channel Digital Class D Integrated Power Amp for Passive Speakers Subwoofer - FosPower RCA Y-Adapter (3 Feet), 1 RCA Male to 2 RCA Male Short Y Splitter Digital Stereo Audio Cable for Subwoofer, Home Theater, Hi-Fi - Dual Shielded | 24K Gold Plated - Tan QY 2RCA to 2RCA Cable 3Ft, Gold-Plated 2 RCA Male to 2 RCA Male Stereo Audio Cable for Home Theater, HDTV, Gaming Consoles, Hi-Fi Systems (3Ft/1M) --- ## 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.be/products/58115674-m04](https://www.desertcart.be/products/58115674-m04) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-08-13*