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Monitor Audio CSS230 Slim Low-Profile In-Ceiling 40W Speaker
Monitor Audio CSS230 Slim Low-Profile In-Ceiling 40W Speaker
Monitor Audio CSS230 Slim Low-Profile In-Ceiling 40W Speaker
Monitor Audio CSS230 Slim Low-Profile In-Ceiling 40W Speaker
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Monitor Audio CSS230 Slim Low-Profile In-Ceiling 40W Speaker

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Monitor Audio logo Monitor Audio
  • 50mm Mounting Depth
  • Gold Dome Tweeter
  • Lifetime guarantee
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The Monitor Audio CSS230 is a slim, low-profile in-ceiling 40W speaker with a super-slim mounting depth of 50mm designed to fit within 2” stud walls. (Read more)

£250.00 Ex VAT
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Product Code18217
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The Monitor Audio CSS230 is a slim, low-profile in-ceiling 40W speaker that features 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.


  • 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)
  Monitor Audio CSS230 Installation Guide
  Monitor Audio CSS230 User Manual
Monitor Audio website
Monitor Audio support site

* External websites provide additional content that supports the content on however the external Web site is subject to change and is beyond the control of Connectec Ltd. Connectec cannot guarantee the accuracy of content on external websites and does not endorse the information or products on any external websites. You will be subject to the external websites own privacy policy when you follow these links.


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Why buy from Connectec?



Our technical support team are experienced installation engineers with years of field experience.



Customer service is our top priority. We always try to ensure we offer a first class service too all our customers.



We offer FREE mainland UK delivery on orders over £75 and FREE next day delivery on orders over £150*.



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