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Monitor Audio Radius 45 Ultra-compact satellite speakers (High-gloss Black)

Item # 893R45PB

We weren't sure if it was really possible for a speaker this small to still perform effectively.

We weren't sure if it was really possible for a speaker this small to still perform effectively.

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4 questions - 5 answers

Item # 893R45PB

In stock
$475.00 pair

Other options

About the Monitor Audio Radius 45

Dave Bar

Pure concentrated fun

We weren't sure if it was really possible for a speaker this small to still perform effectively. Boy, were we surprised! Even though the Radius 45 may be the smallest speaker Monitor Audio has ever built, this tiny cube delivers Monitor's signature wide-open sound in spades.

Pure concentrated fun

We weren't sure if it was really possible for a speaker this small to still perform effectively. Boy, were we surprised! Even though the Radius 45 may be the smallest speaker Monitor Audio has ever built, this tiny cube delivers Monitor's signature wide-open sound in spades.

With its front-firing 3" mid/bass driver and rear-firing gold dome tweeter, the R45 will fill your living space with a tonal presence and spaciousness that must be heard to be believed. Pair these speakers with Monitor Audio's Radius 380 subwoofer to create an ultra-discreet, high-performance music or multichannel surround sound system. 

Monitor Audio's secret sauce 

The Radius 45 benefits from many of the technical advances, materials, and construction techniques found in Monitor's top-of-the-line speakers. Its 3/4" dome tweeter is made of a high-tech ceramic-coated aluminum/magnesium alloy.

This exceptionally stiff, lightweight material allows the driver to respond swiftly and precisely to the audio signal for greater accuracy. The tweeter also gets an anodized coating of gold that helps ensure smooth, extended highs.

Gorgeous build quality and design

Monitor Audio speakers have long been known for their sturdy, vault-like cabinet construction. The R45's rigid MDF enclosure feels solid and substantial, with an exterior clad in a beautiful high-gloss black or white finish.

Got wire?

Most speakers don't include any. Read our article about choosing and installing speaker wire.
Shop our selection of speaker wire.


Product highlights:

  • frequency response: 120-20,000 Hz
  • sensitivity: 87 dB
  • recommended amplifier power: 15-50 watts
  • impedance: 8 ohms
  • ultra-rigid, lightweight C-CAM® (Ceramic-Coated Aluminum/Magnesium) cone material provides high efficiency and low distortion
  • rear-firing 3/4" C-CAM gold dome tweeter
  • 3" MMP® II (Metal Matrix Polymer) mid/bass driver
  • acoustic-suspension (sealed) cabinet design
  • five-way binding post speaker terminals
  • 3-15/16"W x 3-15/16"H x 4-7/8"D
  • weight: 2.25 lbs. each
  • warranty: 5 years
  • MFR # R45PB

What's in the box:

  • 2 Satellite loudspeakers
  • 2 Grilles (attached)
  • 8 Rubber feet
  • Grille removal tool
  • Owner's Manual
  • Important Safety Instructions

Customer reviews for Monitor Audio Radius 45

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4.5 out of 5 stars
13 reviews

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More details on the Monitor Audio Radius 45

Stacey B.

Features & specs

Enclosure Sealed
Finish Lacquer
Color Gloss Black
Tweeter Type Hard-Dome
Tweeter Size (inches) 0.75
Midrange Size (inches) N/A
Woofer Size (inches) 3
Woofer Composition Polymer
Woofer Surround Rubber
Power Range 15-50
Sensitivity 87 dB
Impedance (Ohms) 8
Frequency Response 120-20k Hz
Connector Type 5-Way post
Bi-amp Inputs No
Height (inches) 4
Width (inches) 4
Depth (inches) 4-7/8
Weight (pounds) 2.25
Wall-mountable With optional bracket
Bracket Included No
Recommended Stand Height (inches) 36
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research


Applications: The Monitor Audio Radius 45 satellite loudspeaker is perfect for discrete sound around your home, or partnered with a Radius powered sub (sold separately) for big stereo sound, or used as surround and surround back speakers in your home theater.

Two-Way Speaker Design: The Monitor Audio Radius 45 features a two-way speaker design with one rear-firing 3/4" C-CAM gold dome tweeter and one front-firing 3" MMP II cone woofer. The tweeter is rear-firing to enhance sound dispersion characteristics. The tweeter and woofer share similar audible consistency producing a smooth transition of frequencies and a sense of realism and cohesion in the soundstage.

  • C-CAM Gold-Dome Tweeter: The gold dome tweeter is formed from a ceramic-coated aluminum/magnesium alloy, gold anodized to a specific thickness for ideal stiffness and damping characteristics. Its new profile and surround geometry have been developed using advanced modeling tools, to provide the optimum qualities for accurate sound reproduction. The new design moves the first order of breakup to beyond 35kHz, producing a linear response way beyond audibility, which matches the wide frequency bandwidth available from HD music and cinema sound formats. The gold dome is thinner, lighter, more rigid and therefore more efficient than domes made from other materials which are prone to distortion in the audio band.
  • Metal Matrix Polymer (MMP II) Woofer: Metal Matrix Polymer driver cones have a polypropylene diaphragm injected with metallic particles to offer a rigid and responsive structure. They are manufactured using a sophisticated high-pressure injection process, which modulates cone thickness at critical points to optimize stiffness and consistency, resulting in a superior sonic performance.
Note: The Radius 45 incorporates a thermal protection device, which helps to protect the woofer and tweeter from permanent damage.

Single Through-Bolt Mount: The tweeter and woofer are fixed to the cabinet with a single through-bolt driver fixing mount. This single-through-bolt mount design provides mechanical de-coupling and enhanced midband clarity and resolution. The through-bolts also act as rigid cross bracing to give a very solid non-resonant cabinet.

Stylish Cabinet: The Monitor Audio Radius 45 features a beautiful precision cabinet in a gloss black, satin white, or walnut finish. The cabinet's smooth rounded edges, silver trim, and metal mesh grille add to the style and look of the speaker.

Gold-Plated Binding Posts: The Radius 45 is fitted with gold-plated binding post speaker terminals that will accept bare wire (up 12AWG), pin-connectors, spade connectors, and banana plugs (single or dual).

Mounting Options: Self adhesive rubber feet are provided to prevent movement due to vibration when using the Radius 45 loudspeakers on a table, shelf, or stand. And thanks to its rear-panel 1/4"-20 threaded insert, the Radius 45 can also be fixed to a wall using an optional wall-mount bracket (sold separately).

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Customer Q&A

4 questions already asked

I am curious about the rear firing tweeter. Usually you want it pointed at your ears. I want these on the sofa end tables as surrounds in an open floor plan (typical Florida house) and would be perfect as to size?
dennis  Oct 30, 2018
2 answers
There isn't a rear firing tweeter. These do a nice job as a surround pair place at ear level to my sofa. The only drivers are forward facing. The picture is with and without the front grill in place.
peter  Nov 05, 2018
They work great as surrounds for a TV system. Lots of sound, I actually had to turn them down because they were too loud. I have them on each side of the sofa so they are close to the sitting position.
moto  Nov 05, 2018
Are there brackets available to allow them to tilt and swivel?
greg  Jan 13, 2018
1 answer
They do feature a standard 1/4"-20 threaded insert for use with optional wall mount brackets. You'll find all of the compatible models by clicking the "Accessories" tab on the speaker's main webpage and then "Speaker Wall Mounts". I hope that helps. My bio:
ryan  Jan 18, 2018 (Staff)
Would I get the same sound quality if I were to hang these speakers on the wall ?
frank  Sep 23, 2015
1 answer
I currently have the speaker mounted on the walls and the sound is fantastic
shawn p  Sep 23, 2015
Is the radius 45 complementary with radius 200 cneter channel in a 5.1 system?
james  Dec 03, 2016
1 answer
I am using them as rear speakers with infinity center channel and the sound great.
ricardo  Dec 03, 2016

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Larger drivers and cabinet for a bigger sound

The Monitor Audio Radius 90 offers these features:
  • a front-firing 1" tweeter and 4" C-CAM® mid/bass driver for fuller sound
  • greater power handling for higher volume levels
  • 80-35,000 Hz frequency response
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