Monitor Audio

Monitor Audio Radius 1 4G Speakers

  • pair of black monitor audio radius speakers
  • white monitor audio radius speakers
  • white monitor audio radius speaker back side
  • back side of black monitor audio radius speaker

RADIUS 1 4G BLACK

$699.00
$699.00

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Ships mid-August 2026.

Color: Black

For store pickups, please call for availability.

Product Overview

The Monitor Audio Radius 1 4G is the smallest model in the Radius Series 4G range, built for installations where space is strictly limited but audio quality cannot be compromised. At 135 × 135 × 156 mm, this sealed 2-way compact speaker houses a 4-inch C-CAM RST III bass-mid driver and a 19mm C-CAM Gold Dome tweeter with a redesigned external magnet motor system, technology derived from Monitor Audio's higher-tier speaker ranges rather than budget speaker practice. Radius 1 4G is positioned as a multi-role speaker for discreet home theatre, surround sound, multi-room, and near-field desktop applications, with a dedicated accessory ecosystem covering wall, ceiling, desktop, and floor stand mounting. Monitor Audio designs the Radius 1 4G under its Transparent Design Philosophy, which holds that every engineering decision, from driver material to crossover topology, should serve accuracy rather than impart a distinctive tonal character of the speaker's own.

Features

  • 2-way sealed (acoustic suspension) compact loudspeaker
  • C-CAM RST III bass-mid driver
  • C-CAM Gold Dome tweeter with redesigned external magnet motor system
  • RST III (Rigid Surface Technology III) cone geometry, reduces resonance and breakup across the frequency range
  • Through-Bolt Driver Bracing, drive units locked to cabinet rear at specified torque for improved rigidity
  • New crossover design with precision component selection and signal-path optimisation
  • Sealed bass alignment, no port
  • Compatible brackets: MASM (wall/ceiling, ball-joint), FIX-M (wall, adjustable angle)
  • Optional accessories: Radius Floor Stand 4G, Radius Desk Pad 4G

Specifications

System format — 2-Way

Drive units — 1x 4" RST III bass-mid driver / 1x 19mm C-CAM Gold Dome tweeter

Frequency response — 100 Hz to 35 kHz (in-room, -6dB)

Sensitivity — 82 dB (2.83 Vrms @ 1m, free-field)

Nominal impedance — 8 Ohms

Minimum impedance — 3.8 Ohms @ 950 Hz

Bass alignment — Sealed

Crossover frequency — 3.2 kHz

Recommended amplifier power — 25 to 50 W into 8 Ohms / 50 to 100 W into 4 Ohms

Continuous power handling — 50 W

Maximum peak SPL — 104 dB

Dimensions (H x W x D) — 135 x 135 x 156 mm (5 5/16 x 5 5/16 x 6 1/8 in)

Weight — 1.8 kg (3 lb 15 oz) each

Finishes — High Gloss Black, Satin White

Sold as — Pair

Warranty — 5 years

radius 1 4g speaker on desktop

Sealed for Smooth System Integration

The Radius 1 4G uses a sealed acoustic suspension enclosure, producing a gradual, controlled bass rolloff that makes subwoofer integration straightforward through an AV receiver's bass management settings. For home cinema and multi-room systems routing low frequencies to a dedicated subwoofer, the sealed alignment avoids the port-tuning peaks that can complicate placement with ported speakers.

Precision Placement: Four Ways to Position

The Monitor Audio Radius 1 4G supports wall and ceiling mounting via the optional MASM ball-joint bracket, fixed-angle wall mounting via the FIX-M bracket at 0, 15, or 30 degrees, desktop placement on the Radius Desk Pad 4G, and freestanding use on the Radius Floor Stand 4G. The four options make it equally at home as a Dolby Atmos height channel, corner surround, desktop near-field monitor, or compact stereo satellite.

Unboxing Radius Series 4G

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Frequently Asked Questions

What is the Monitor Audio Radius 1 4G and what is it designed for?

The Monitor Audio Radius 1 4G is an ultra-compact 2-way sealed loudspeaker built for discreet home theatre, surround sound, multi-room, and near-field desktop audio applications. Measuring just 135 x 135 x 156 mm, it uses C-CAM driver technology derived from Monitor Audio's higher-tier ranges, delivering precise sound from an exceptionally compact cabinet. The Monitor Audio Radius 1 4G is available at Trutone Electronics in Mississauga, Ontario.

Does the Monitor Audio Radius 1 4G need a subwoofer?

The Monitor Audio Radius 1 4G is designed to be used with a subwoofer for full-range performance, with its sealed cabinet rolling off below 100 Hz in-room. For background audio, desk-based near-field use, or speech-heavy TV content it can function independently. For music-first or cinematic systems, a subwoofer is necessary.

What are the mounting options for the Monitor Audio Radius 1 4G?

The Monitor Audio Radius 1 4G is compatible with the MASM ball-joint bracket for wall or ceiling installation, the FIX-M adjustable wall bracket with 0, 15, or 30-degree angle presets, and the Radius Desk Pad 4G for desktop placement with vibration isolation. The optional Radius Floor Stand 4G with wooden tripod legs and integrated cable routing supports freestanding use. This range of options makes the Radius 1 4G adaptable to surround height channels, corner surrounds, desktop near-field, and compact stereo configurations.

What is the difference between the Monitor Audio Radius 1 4G and the Radius 3 4G?

The Monitor Audio Radius 3 4G is significantly more capable, with a 4.5-inch RST III bass-mid driver versus a 4-inch in the Radius 1 4G, a larger 25mm tweeter versus 19mm, and a ported enclosure that extends in-room bass to 44 Hz compared to 100 Hz for the sealed Radius 1 4G. The Radius 3 4G can function as a standalone stereo speaker in smaller rooms; the Radius 1 4G is optimised for surround, multi-room, and desktop roles where the smallest possible footprint matters. Buyers who need a primary stereo or TV speaker should consider the Radius 3 4G; those prioritising discreet compact installation should look at the Radius 1 4G.

What amplifier power does the Monitor Audio Radius 1 4G require?

The Monitor Audio Radius 1 4G is rated for 25 to 50 watts per channel into 8 ohms, or 50 to 100 watts into 4 ohms. Its nominal impedance is 8 ohms, though the minimum dips to 3.8 ohms at 950 Hz, which buyers using amplifiers specified for a 6-ohm minimum load should check before purchasing. Most modern AV receivers and integrated amplifiers easily exceed the 25-watt minimum requirement.

Can the Monitor Audio Radius 1 4G be used as surround or Atmos height speakers?

The Monitor Audio Radius 1 4G is well suited for surround and Dolby Atmos height channel duties. Its compact dimensions and MASM ball-joint bracket support discreet wall or ceiling mounting, and its sealed enclosure produces a smooth bass rolloff that integrates cleanly with an AV receiver's bass management system.

What driver technology does the Monitor Audio Radius 1 4G use?

The Monitor Audio Radius 1 4G uses a 4-inch C-CAM RST III bass-mid driver paired with a 19mm C-CAM Gold Dome tweeter. C-CAM stands for Ceramic-Coated Aluminium/Magnesium, a lightweight, rigid cone material Monitor Audio uses across its speaker ranges. The 4G generation introduces a redesigned Gold Dome tweeter with an external magnet motor system, replacing the conventional internal puck magnet of previous Radius models.

How does the Monitor Audio Radius 1 4G's sealed enclosure differ from a ported design?

The Monitor Audio Radius 1 4G uses a sealed acoustic suspension enclosure, meaning bass rolls off gradually and predictably rather than with the sharper rolloff of a ported design tuned to a specific frequency. A sealed cabinet is easier to integrate with a subwoofer because the handover region is smooth and free from port-tuning peaks. For surround, multi-room, and desktop applications where bass is managed by an AV receiver or separate subwoofer, the sealed alignment is a deliberate engineering choice rather than a size-imposed limitation.