{"product_id":"fosi-audio-m04-subwoofer-amplifier-mono-class-d-100w","title":"Fosi Audio M04 Subwoofer Amplifier Mono Class D 100W","description":"\u003cp\u003e\u003cstrong\u003eThe Fosi Audio M04 is a compact mono Class D amplifier built to drive passive subwoofers or a single low-frequency speaker, delivering up to 100 watts into 2 ohms with selectable subwoofer or full-frequency modes.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eSmall but capable, the M04 combines a Texas Instruments TPA3116 power stage with an NE5532 op-amp to punch out deep low frequencies without taking much rack or shelf space. It adds practical controls such as a low-pass filter, sub frequency adjustment, and a mode selector so you can tailor the output for a dedicated subwoofer or a full-range mono output. The amp ships with a compatible 19V\/4.74A power supply and a user manual, making it ready for fast integration into a home theater or stereo setup.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the M04 improve bass in a home theater?\u003c\/h3\u003e\n\u003cp\u003eThe M04 focuses amplifier power and filtering specifically on low frequencies to add weight and control to your system’s bass. Using its built-in low-pass filter and sub frequency control, it isolates and amplifies the sub region while keeping mids and highs clean through your main speakers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBuilt-in low-pass filter for precise bass-only output\u003c\/li\u003e\n  \u003cli\u003eSub frequency control to tune roll-off to room and subwoofer size\u003c\/li\u003e\n  \u003cli\u003e100W peak output into a 2-ohm load for robust low-end impact\u003c\/li\u003e\n  \u003cli\u003eClass D efficiency reduces heat and power draw during playback\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat connectivity and controls will I find on the M04?\u003c\/h3\u003e\n\u003cp\u003eThe front and rear panels put key adjustments and input options within reach so setup is quick. A mode selector switches between subwoofer and full-frequency mono operation, while input jacks and gain controls let you match the amp to preouts or receiver lines.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRCA line input compatible with most preamp and receiver sub outs\u003c\/li\u003e\n  \u003cli\u003eMode selector for subwoofer vs full-frequency mono operation\u003c\/li\u003e\n  \u003cli\u003eGain and frequency controls for level and crossover tuning\u003c\/li\u003e\n  \u003cli\u003eCompact terminal\/output connectors for passive subwoofers or speakers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow loud and efficient is this mini amplifier?\u003c\/h3\u003e\n\u003cp\u003eThanks to its Class D design around the TI TPA3116 chip, the M04 delivers strong bass output with high power efficiency. That means you get louder low frequencies with less heat buildup compared with many linear-class amplifiers of the same size.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEfficient Class D topology for minimal heat under load\u003c\/li\u003e\n  \u003cli\u003eDesigned to deliver up to 100W into a 2-ohm sub or speaker\u003c\/li\u003e\n  \u003cli\u003eCompact footprint preserves shelf or rack space in small rooms\u003c\/li\u003e\n  \u003cli\u003eNE5532 op-amp for improved signal handling and cleaner lows\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat’s included and how straightforward is installation?\u003c\/h3\u003e\n\u003cp\u003eThe package includes the M04 amplifier, a matched 19V\/4.74A power supply, and a user manual so you can get the amp operating quickly. Typical installation requires connecting an RCA sub\/preamp output or line-level source and running speaker wires to your passive subwoofer or single speaker.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eM04 mono amplifier unit with front and rear controls\u003c\/li\u003e\n  \u003cli\u003e19V\/4.74A external power adapter for safe, reliable power\u003c\/li\u003e\n  \u003cli\u003eUser manual with wiring and control guidance\u003c\/li\u003e\n  \u003cli\u003eSimple line-level and speaker connections—no complex calibration tools\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Fosi Audio M04 is aimed at home theater enthusiasts and compact-system builders who want stronger, more tunable bass without adding a large powered subwoofer. It suits users upgrading passive subs, converting a passive speaker into a dedicated low-frequency driver, or adding mono bass power to a small listening room or media center. If you need a space-saving, efficient amplifier focused on low frequencies with flexible controls, the M04 is a practical, budget-friendly option.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can the M04 drive a passive subwoofer directly?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the M04 is a mono amp designed to power passive subwoofers directly, with a built-in low-pass filter and sub frequency control for tuning.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What power supply does the M04 use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The amp uses the included external 19V\/4.74A power supply rated to support its Class D output safely.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":48444301803677,"sku":"B07942M4MC","price":70.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/9596\/1757\/files\/fosi-audio-m04-front-panel.jpg?v=1781542342","url":"https:\/\/nexoltic.com\/products\/fosi-audio-m04-subwoofer-amplifier-mono-class-d-100w","provider":"Nexoltic","version":"1.0","type":"link"}