Monitor Audio Radius 3 (4G) Bookshelf Speakers

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Colour

High Gloss Black

Satin White

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A compact 2-way speaker from the Monitor Audio Radius 4G series, with a 4.5-inch C-CAM RST III bass-mid driver and a 25 mm C-CAM Gold Dome tweeter. Sold as a pair in High Gloss Black or Satin White.

Monitor Audio describes Radius 3 4G as a high-performance mini-monitor for TV, film, music, gaming and multi-room listening, including discreet commercial installations. It can sit on a desktop, a floor stand or a wall mount.

Drivers

4.5" bass-mid, 25 mm tweeter

Format

2-way, ported

Frequency response

44 Hz to 35 kHz (-6 dB, in-room)

Impedance

8 ohms nominal

Sensitivity

84 dB (2.83 V, 1 m)

Size (H x W x D)

255 x 150 x 201 mm

Why you will love it

Drivers with their own motor systems

The 4.5-inch C-CAM bass-mid driver uses Monitor Audio's RST III cone geometry. It is paired with a 25 mm C-CAM Gold Dome tweeter, and each driver has its own optimised motor system.

Monitor Audio lists a new crossover design, through-bolt driver bracing and HiVe II ports. The crossover is at 2.7 kHz and the port is tuned to 53 Hz.

Rear of a Monitor Audio Radius 3 4G speaker showing the port and terminals

Desk, stand or wall

Monitor Audio says a wall, desktop or floor stand all work, so the speaker can be placed to suit the room. The FIX-M speaker mount is listed as a compatible bracket.

The matching Radius Floor Stand 4G attaches to each speaker with a single bolt, and speaker cable can be routed down through the stand.

Monitor Audio Radius 3 4G speakers on floor stands beside a sofa

Add a subwoofer for full range

Radius 3 4G is rated down to 44 Hz in-room (-6 dB). Monitor Audio suggests pairing it with one of its subwoofers for full-range performance.

Monitor Audio Radius 3 4G speaker on a desk beside a laptop and bookshelf

Is it right for you?

A great fit if you…

Want a compact stereo pair for a desk, shelf or small living room
Are building a discreet TV, film or multi-room system
Want the option of wall, desktop or floor-stand placement

Worth knowing

Sold as a pair of passive speakers, so it needs an amplifier or receiver
Monitor Audio recommends 40 to 75 W into 8 ohms, or 75 to 150 W into 4 ohms
Floor stands and wall brackets are separate items

Build your system

Radius 3 4G is part of the Radius 4G family, so the stand, wall speaker and subwoofer options sit alongside it.

Floor stands: Add the Monitor Audio Radius Floor Stand 4G for floor placement.
Smaller sibling: For tighter spaces see the Monitor Audio Radius 1 4G.
TV and film: Place the Monitor Audio Radius On-Wall 4G beside a screen.
Bass: Browse subwoofers or the Monitor Audio range.
Amplification: Drive them from a stereo amplifier or an AV receiver.

Specifications

Audio

System format	2-way
Frequency response (in-room, -6 dB)	44 Hz to 35 kHz
Sensitivity (2.83 Vrms at 1 m, free-field)	84 dB
Nominal impedance	8 ohms
Minimum impedance (20 Hz to 20 kHz)	4 ohms at 250 Hz
Maximum peak SPL (AES75, Z-weighted)	107 dB
Continuous power handling (CTA 426-B)	75 W
Recommended amplifier power (RMS, music signal)	75 to 150 W into 4 ohms; 40 to 75 W into 8 ohms

Design

Bass alignment	Ported
Port tuning frequency	53 Hz
Crossover frequency (LF/HF)	2.7 kHz
Drive units	1 x 4.5" RST III bass-mid driver; 1 x 25 mm C-CAM Gold Dome tweeter

Physical

Finishes	High Gloss Black, Satin White
Dimensions (H x W x D)	255 x 150 x 201 mm
Weight (each)	3.7 kg
Sold as	Pair
Compatible bracket	FIX-M

Specifications from the Monitor Audio Radius 3 4G product page (monitoraudio.com), checked November 2026.

Questions people ask

Is Radius 3 4G sold as a pair?

Yes. Monitor Audio lists it as sold as a pair.

Can it go on a stand or the wall?

Monitor Audio lists desktop, floor-stand and wall-mount placement. The Radius Floor Stand 4G fits with a single bolt, and the FIX-M mount is listed as a compatible bracket.

How much amplifier power does it need?

Monitor Audio recommends 40 to 75 W RMS into 8 ohms, or 75 to 150 W into 4 ohms.

What is the nominal impedance?

8 ohms nominal, with a minimum of 4 ohms at 250 Hz.