Sony XMS-400D – Ultra-Compact 4-Channel Class D Amplifier (400W) The Sony XMS-400D is one of the most compact, clean, and efficient 4-channel amplifiers on the market—perfect for OEM upgrades, motorcycles, UTVs, boats, or any vehicle where space is tight but sound quality matters. Despite its tiny footprint, this amp delivers up to 400 watts of clean Class-D power, giving your speakers the clarity, volume, and headroom factory systems can’t provide. At just a fraction of the size of traditional amps, the XMS-400D can mount behind the dash, under a seat, inside a fairing, or nearly anywhere you can fit a paperback book. High-level inputs allow direct connection to factory radios without needing a line output converter, while low-level RCA inputs make it a drop-in match for aftermarket stereos. A built-in LPF (low-pass filter) and HPF (high-pass filter) help protect your speakers and fine-tune your system. The amplifier’s Class-D design keeps heat low and efficiency high, ensuring stable performance even during long play sessions. Key Features – Sony XMS-400D Ultra-compact 4-channel amplifier – perfect for tight space installs 400W max output 45W RMS × 4 @ 4Ω – clean power for aftermarket or factory speakers Class-D design – cooler operation, smaller size, higher efficiency High-level & low-level inputs – works with OEM and aftermarket radios Selectable High-Pass / Low-Pass filters Compact metal chassis – durable and vibration-resistant Easy installation in boats, cars, UTVs, motorcycles, and powersports vehicles Technical Specifications – Sony XMS-400D Amplifier Type 4-channel Class-D Max Power Output 400W total RMS Power 45W × 4 @ 4Ω Input Types High-level (speaker-level) & RCA low-level Filters HPF / LPF selectable Chassis Size Ultra-compact (fits behind dash) Ideal Speaker Setup 4 door speakers or 2 speakers + sub (passive) Ideal For OEM system upgrades Motorcycles UTVs & side-by-sides Boats & marine audio Compact vehicles with limited space Replacing factory power with cleaner output What’s in the Box Sony XMS-400D amplifier Wiring harness Mounting hardware Documentation / warranty Compatibility / Installation Notes Amplifiers require proper power wire, ground, fuse protection, speaker wiring, signal integration, and gain / crossover setup. Confirm speaker or subwoofer impedance and RMS power handling before pairing this amplifier with a system. Professional installation is recommended for safe wiring, correct tuning, and long-term reliability. Why Buy From MCOR Automotive Authorized Sony retailer for genuine Sony car and marine audio products Products sold by MCOR Automotive are eligible for applicable Sony manufacturer warranty coverage 20+ years of vehicle audio installation, system design, and product-matching experience Nationwide fulfillment with support from real 12-volt automotive audio specialists
