Super Slim ceiling speaker – Monitor Audio CSS230


In stock

At just 50mm deep, this in-ceiling speaker, offers high quality audio, in even the most shallow soffit. Combined, the three proprietary 3″ mid-bass units achieve the bass output of a 6 1/2″ driver, all from a super-stealthy flush-fitted profile.

In stock


CSS230 Super Slim Ceiling Speaker

The CSS230 is a brilliantly innovative back-box design with an impressively shallow 50 mm (2″) mounting depth, custom built to offer hi-fi levels of performance in spaces where no high quality speaker has gone before.

Between 2″ stud frames or where pipework or cabling reduces mounting depth, the hybrid back-box construction and proprietary full-range driver array combine to deliver consistent audio quality with exceptional installation versatility.

The hybrid back-box provides the best of all worlds for installer and customer. Combined, the three proprietary 3″ mid-bass units achieve the bass output of a 6 1/2″ driver, all from a super-stealthy flush-fitted profile. 

In keeping with Monitor Audio’s renowned design rigour, the crossover comprises high quality film capacitors and low loss inductors – selected for signal integrity – ensuring peerless audio detail and dynamics from a speaker of its size and application. When the CSS230 is in ‘ported’ mode, a fine gauze protects the acoustic system from dust ingress.

Optional square or premium grille can be used with this model.

This product is now available to use with home theatre design software, The CEDIA Designer. 

Monitor Audio CSS230 Speaker Terminals

Key Features

  • Super-slim mounting depth 50 mm (2″) designed to fit within 2” stud walls or where space is restricted
  • Hybrid CP ‘Controlled Performance’ style, enclosed or open back-box option provides flexible high performance options and sound isolation in one (pictured right)
  • Driver configuration of three 3″ C-CAM bass/mid-range drivers in a radial array around a 19 mm C-CAM Gold Dome tweeter (fixed position) and high quality crossover design offers Monitor Audio’s award-winning signature sound quality
  • Gold plated sprung push terminals are reliable and easy to connect
  • Magnetically attached ‘Trim-less’ round and square grille options for discreet, reliable and easy servicing, flexible in-wall/ceiling installation, paintable to blend with décor
  • Patented Tri-Grip dog leg fixings – Reliable, robust and quick to install
  • Existing CB6 pre-construction bracket for easier system design and planning


Frequency Response (-6 dB)
100 Hz – 30 kHz sealed ‘CP’ (85 Hz – 30 kHz –open back)

Nominal Impedance
8 ohms

Sensitivity (1W@1M)
86 dB

Maximum SPL
103.8 dBA

Power Handling (RMS)
40 Watts – Full range (60 watts with crossover set to 100 Hz @ 12 dB/Octave)

Recommended Amplifier Requirements
10 – 60 W

Drive Unit Complement
3 x 3″ C-CAM cone bass-mid drivers
1 x 19 mm (3/4″) C-CAM Gold Dome tweeter

Crossover Recommendation
100 Hz at a minimum of 12 dB/Octave (24 dB/Octave optimum)

Gold Plated Sprung push terminals – for bare wire connection up to 4 mm(2)

Overall Diameter (Including Grille)
250 mm (913/16″)

Overall Depth (Including Grille)
54 mm (21/8″)

Cut-Out Hole Diameter
211 mm (81/4″)

Mounting Depth
50 mm (2″)

Optional Square Grille – Outer Dimensions
249 x 249 mm (9 3/16″)

Fixing Type
3 position Tri-Grip dog leg fixings

Construction Material
ABS (UL94 rated, RoHS2 Compliant) – Painted steel grille

2.88 kg (6 lb 5 oz)

Pre-Construction Bracket
CB6 Pre-Construction Bracket (Purple)

Sold As
Single Unit

Monitor Audio CSS230
Monitor Audio CSS230
Monitor Audio CSS230

Additional information


Monitor Audio

Speaker Type


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