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Yamaha MS101-4 — Compact Powered Monitor for Desktop and Field Use

The Yamaha MS101-4 is a compact desktop powered monitor speaker built for users who need reliable, clean sound in tight spaces. It delivers 30W of amplification through a single 4-inch full-range cone driver in a bass-reflex enclosure. The MS101-4 fits AV monitoring, FOH-to-stage communications, device inspection, and facility audio management. Its low-profile chassis and removable AC power cord make it equally at home on a studio desk or a temporary installation.

What Sets the MS101-4 Apart

Unlike traditional 2-way monitors, the MS101-4 uses a single full-range 4-inch cone driver with a 1-inch voice coil and ferrite magnet, paired with a rear-firing bass-reflex port. The Class-D amplifier runs fanless for silent operation. A 3/8-16 threaded mounting point allows direct attachment to Euro microphone stands, with the optional BMS-10A adaptor enabling tilt-angle adjustment.

Frequency Response and Output — Nearfield Monitoring Clarity

The MS101-4 delivers a frequency range suited to speech, music playback, and detailed audio editing at close listening distances.

• Frequency Range (-10dB): 77 Hz – 20 kHz — covers the full spectrum of voice and music content
• Maximum Output Level: 115 dB SPL at 1 m on axis — adequate headroom for nearfield and small-room use
• Driver Configuration — a single 4" full-range cone with 1" voice coil and ferrite magnet delivers coherent sound without crossover artifacts

Class-D Amplification — Clean Power in a Compact Package

The MS101-4's built-in Class-D amplifier provides efficient power delivery while keeping the unit cool and silent. Universal voltage support makes it deployable worldwide.

• Dynamic Power: 30 W — clean, high-output sound for desktop monitoring
• Continuous Power: 20 W
• Cooling: Natural convection (no fan) — silent operation in quiet rooms
• Power Requirements: 100–240 V, 50/60 Hz — universal voltage for international use

Inputs, Outputs, and EQ — Flexible Signal Routing

The MS101-4 accepts both line-level and microphone signals, connecting directly to mixers, keyboards, computers, and presentation microphones.

• Front Input: Combo XLR / 6.3 mm TRS — accepts mic or line sources directly on the front panel
• Rear Inputs: 3.5 mm stereo mini + 6.3 mm TRS
• Line Out: 1 x 6.3 mm TRS — daisy-chain to additional monitors or a subwoofer
• Tone Controls — LOW and HIGH EQ on the front panel tailor the sound to your room

Ideal Users — Presenters, Engineers, and AV Professionals

The MS101-4 is the right choice for AV technicians, live sound engineers, and presenters who need a compact monitor that accepts both mic and line signals. FOH and monitor engineers will appreciate the stage-communication use case, while keyboard players benefit from clean full-range reproduction at close range. At 2.1 kg with a 142 × 196 × 187 mm footprint, it travels easily between setups.

Yamaha Pro Audio — Decades of Monitor Engineering

Yamaha released the MS101-4 in March 2022 as the latest evolution of its compact powered monitor line, succeeding the MS101III. From the HS series to the MSP3A, Yamaha's powered monitor family shares a common philosophy: clean sound, intuitive controls, and durable construction.