Monitor Audio CSS230 (Single Super-Slim) Super-Slim In-Ceiling Speaker

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The super slim CSS230 offers a brilliantly innovative back-box design to produce hi-fi levels of performance in spaces no high-quality speaker has gone before.

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Specifications of the Monitor Audio CSS230 (Single Super-Slim)

  • Weight (Kg) 2.000000
  • Brand Monitor Audio
  • Warranty Lifetime
  • Width 250 mm
  • Height 54 mm
  • Cut-out Dimensions 211 mm
  • Mounting Depth from Surface 50 mm
  • Sensitivity (1W@1M) 86 dB
  • Maximum SPL 103.8 dBA
  • Frequency Response 100 Hz – 30 kHz sealed ‘CP’ (85 Hz – 30 kHz –open back)
  • Finish White (Paintable)
  • 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
  • Power Handling (RMS) 40 Watts – Full range (60 watts with crossover set to 100 Hz @ 12 dB/Octave)
  • Crossover Recommendation 100 Hz at a minimum of 12 dB/Octave (24 dB/Octave optimum)
  • Connectivity Gold Plated Sprung push terminals – for bare wire connection up to 4 mm(2)
  • Speaker Depth Ultra Slim (50mm & Under)
  • Speaker Size 2-3"
  • Speaker Type In-Ceiling

At Smart Home Sounds we pride ourselves on customer satisfaction and would like our customers to be 100% happy with their purchase.

We offer 30-day hassle-free returns and personalised service from real-life people. If an item doesn't meet your expectations, simply return your item to us in its original condition and packaging within 30 days for a full refund or exchange. 


  • For hygiene reasons, we are unable to give refunds on in-ear headphones if used
  • Video games cannot be retuned if the seal is broken (unless faulty)

Want to return a faulty or damaged product? No worries - Smart Home Sounds will arrange a collection or exchange should this be necessary.

Full terms & conditions

Super-slim design

Monitor Audio CSS230

Monitor Audio CSS230

Limited on ceiling void space or facing a situation where pipework or cabling is reducing mounting depth, The super Slim CSS230 at only 50mm deep is designed to fit the most demanding install scenarios.

Featuring a hybrid backbox and combining three proprietary 3" mid-bass units enables the speaker to 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 incorporates high-quality film capacitors and low loss inductors - chosen for signal integrity. This ensures unequalled 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 potential dust ingress


  • Ultra-slim mounting depth of 50mm (2”) designed to fit within 2” stud walls or where space is limited.
  • Hybrid CP ‘Controlled Performance’ style, enclosed or open back-box option provides flexible high-performance options
  • Driver configuration of three 3” C-CAM bass/midrange drivers for an array around a 19mm high quality 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
Monitor Audio CSS230

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