Monitor Audio CSS230 Super Slim In-Ceiling Speaker

The CSS230 is a brilliantly innovative back-box design with an impressively shallow 50mm (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.

Monitor Audio CSS230 Super Slim In-Ceiling Speaker

In-Ceiling Speaker Grille Shape
  • 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 100Hz @ 12dB/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 4mm

    Overall Diameter (Including Grille)

    250 mm (9 13/16”)

    Overall Depth (Including Grille)

    54 mm (2 1/8”)

    Cut-Out Hole Diameter

    210 mm (8 5/16”)

    Mounting Depth

    50 mm (2”)

    Fixing Type

    3 position Tri-Grip dog leg fixings

    Construction Material

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

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