Monitor Audio Radius 3 4G Speakers

Monitor Audio Radius 3 4G Speakers

$1,200.00

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Colour: White

Black

White

Product variants

Radius 3 is a high-performance mini-monitor delivering precise, high-fidelity sound for TV, film, music, gaming and multi-room applications, including discreet commercial installations. Featuring a 4.5-inch C-CAM driver with RST III geometry and a 25mm C-CAM Gold Dome tweeter, each powered by its own optimised motor system, it combines impressive sonic performance with exceptional versatility, supporting desktop, floor-stand or wall-mount installation.

Available July 2026

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Specifications

System Format : 2 Way
Frequency Response, In-Room (-6dB): 44 Hz - 35 kHz
Sensitivity (2.83 Vrms @ 1m, Free-Field): 84 dB
Sensitivity (2.83 Vrms @ 1m, Installed): N/A
Nominal Impedance: 8 Ohms
Minimum Impedance (20Hz to 20kHz): 4.0 Ohms @ 250 Ohms
Maximum Peak SPL (AES75, Z-weighted) 107 dB
Continuous Power Handling: 75 W
Recommended Amplifier Power:
75 - 150 W into 4 Ohms
40 - 75 W into 8 Ohms
Bass Alignment: Ported
Port Tuning Frequency: 53 Hz
Crossover Frequency LF/HF: 2.7 kHz
Drive Unit Complement
1x 41/2" RST III bass-mid driver
1x 25mm C-CAM Gold Dome tweeter"
Available Finishes:
High Gloss Black
Satin White
External Dimensions with all accessories fitted (H x W x D): 255 × 150 x 201 mm
Weight: 3.7 kg
Sold As : Pair

Clearly the best of Monitor Audio's long line of small speakers so far.

StereoNet

RST III Bass/Mid Driver & Motor System

The all-new RST III C-CAM cone and motor system in the Radius 4G represents a significant evolution in Monitor Audio's metal cone and driver technology. The bass/mid drivers have undergone full FEA optimisation, improving driver surround, spider and chassis design to reduce breakup and reduce resonances.
Larger magnets, improved voice coil, and enhanced venting, it delivers greater control, reduced distortion and improved dynamic range. Complementing this is the new C-CAM Gold Dome Tweeter with an optimised UD Waveguide, ensuring smooth, extended high frequencies, precise dispersion, and seamless integration with the RST III driver. The result is a speaker that offers remarkable clarity, punch, and immersive high-fidelity performance in a compact, versatile form.

Through-Bolt Driver Bracing

Through-bolt driver technology secures each driver directly to the cabinet via a tensioned bolt running through to the rear panel, allowing the drive units to be precisely braced and tightened to an exact torque. This creates a rigid, low-resonance structure that ensures both driver and cabinet remain structurally strong, significantly reducing unwanted chassis and cabinet vibrations. The result is lower colouration, improved clarity, tighter bass, and a more controlled, refined overall performance.

HiVe II Port Technology

The refined HiVe Il ports on Radius 4G are engineered to deliver cleaner, faster airflow, reducing turbulence and minimising unwanted chuffing. On the all-new Radius 3 model, the ports have been enlarged by 50% compared to the previous generation, further enhancing smooth airflow and delivering tighter, more controlled bass performance.

Crossover

The Radius 4G features carefully engineered crossovers, each is optimised to deliver seamless integration between the C-CAM Gold Dome Tweeter and RST III driver. Precision components ensure smooth, balanced frequency response, tight imaging, and coherent sound, allowing the speaker to reproduce music and dialogue with clarity, impact, and true high-fidelity accuracy.

Wall Brackets

The Radius 1 and Radius 3 can be mounted on walls using the MASM and FIX-M brackets, respectively. Both solutions provide straightforward installation while offering flexible orientation and adjustable angles, allowing the speaker to be positioned precisely for optimal performance in any space.

Floor Stand

The custom-designed Radius Floor Stand combines style with stability. Its wooden tripod legs provide a modern, contemporary aesthetic while offering a secure and sturdy base. The Radius 1 or Radius 3 attaches easily with a single bolt, and speaker cables can be neatly routed from the terminals down through the stand, exiting at the base for a clean, uncluttered appearance.

Desk Pad

Designed for the Radius 1 and Radius 3, the Desk Pad provides a stable, secure platform for desktop placement of either speaker. Crafted from precision-engineered rubber with specific hardness for effective vibration isolation, it minimises unwanted resonance while enhancing clarity. The Desk Pad also offers a subtle upward tilt, angling the speakers for optimal sonic performance in desktop environments.

Who is this for?

Monitor Audio Radius 3 4G Speakers

A meaningful improvement on the already capable third-generation Radius 90 it replaces, it is my new favourite baby monitor. It doesn’t so much change the laws of physics as look the other way.