{"product_id":"atc-r4-150-4-channel-150w-amp","title":"ATC R4-150 4-channel 150W amp","description":"\u003cp\u003eThe \u003cstrong\u003eATC R4‑150 Pro\u003c\/strong\u003e is a compact 4‑channel, 5U rack‑mount power amplifier that delivers 150 W continuous output per channel, combines the proven MOSFET Class A\/B circuitry of the classic R1‑450 series with a slimmer chassis, balanced XLR inputs and Neutrik NL4 speaker outputs, and adds remote‑trigger power control for modern immersive‑audio installations.\u003c\/p\u003e\n\u003ch2\u003eDesign and Power Architecture\u003c\/h2\u003e\n\u003cp\u003eATC equips each of the four channels with an independent MOSFET Class A\/B amplifier and a dedicated power transformer, which minimises crosstalk and guarantees full‑rated power even when all channels run simultaneously. The chassis measures only 5U, saving two rack units compared with a pair of the earlier P1 Pro units, while fan‑less convection cooling keeps operation silent for control‑room environments.\u003c\/p\u003e\n\u003ch2\u003eInput and Output Connectivity\u003c\/h2\u003e\n\u003cp\u003eBalanced XLR connectors feed the front‑panel bi‑colour LEDs that display power status and limiter activity, providing instant visual feedback. Speaker‑level signals exit via robust Neutrik NL4 connectors, ensuring secure, low‑impedance connections to loudspeakers.\u003c\/p\u003e\n\u003ch2\u003eSignal Integrity and Noise Rejection\u003c\/h2\u003e\n\u003cp\u003eATC’s class‑leading input stage achieves exceptional common‑mode rejection—exceeding a factor of 10 000 across the audio bandwidth—so the amplifier thrives in electrically noisy settings such as machine rooms or multi‑room facilities. Low noise and ultra‑low crosstalk preserve the purity of the source material.\u003c\/p\u003e\n\u003ch2\u003eProtection and Remote Operation\u003c\/h2\u003e\n\u003cp\u003eThermal and DC‑offset protection guard each channel against overload, while rear‑mounted remote‑trigger inputs let installers power the unit on or off from a central control system, adding flexibility to complex rigs.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose the ATC R4‑150 Pro\u003c\/h3\u003e\n\u003cp\u003e• \u003cstrong\u003eSpace‑saving 5U footprint –\u003c\/strong\u003e fits tighter racks without sacrificing power\u003c\/p\u003e\n\u003cp\u003e• \u003cstrong\u003eFour independent 150 W MOSFET channels –\u003c\/strong\u003e delivers clean, headroom‑rich sound\u003c\/p\u003e\n\u003cp\u003e• \u003cstrong\u003eBalanced XLR inputs + Neutrik NL4 outputs –\u003c\/strong\u003e ensures secure, low‑noise connections\u003c\/p\u003e\n\u003cp\u003e• \u003cstrong\u003eFan‑less convection cooling –\u003c\/strong\u003e silent operation for control‑room use\u003c\/p\u003e\n\u003cp\u003e• \u003cstrong\u003eRemote‑trigger power control –\u003c\/strong\u003e simplifies integration in immersive setups\u003c\/p\u003e","brand":"Loudspeaker Technology Ltd","offers":[{"title":"Default Title","offer_id":56718841348479,"sku":"ITM011085","price":3667.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/4915\/9716\/files\/atc--r4150-pro-kmr2_ac204ca3-cf47-43d6-8d48-fe462c94b93d.jpg?v=1769520113","url":"https:\/\/kmraudio.com\/products\/atc-r4-150-4-channel-150w-amp","provider":"KMR Audio","version":"1.0","type":"link"}