Monitor Audio
Monitor Audio Super Slim CSS230
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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.
Key Features:
- Super-slim mounting
- Hybrid CP enclosed or open back-box option
- 3 x 3" C-CAM cone bass-mid drivers
- 1 x 3/4" C-CAM Gold Dome tweeter
- Gold plated sprung push terminals
- Tri-Grip II for easy and secure fitment
- Compatible with CB6 pre-construction bracket
British High-Fidelity Architectural Sound Redefined
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 backbox provides the best of all worlds for installers and customers. 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 grilles can be used with this model.

Specifications
Category |
Details |
|---|---|
| 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) |
| Connection | 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 |
| Weight | 2.88 kg (6 lb 5 oz) |
| Pre-Construction Bracket | CB6 Pre-Construction Bracket (Purple) |
| Sold As | Single Unit with CM-Round Grille (white) |
| Warranty | Lifetime |

Transparent Design Philosophy
Every Monitor Audio product is the result of intense collaboration, drawing on decades of experience within the design team and ensuring that all the elements of performance, technology and design work in harmony.
Creator Series is the physical manifestation of this approach.
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Tier 1
A comprehensive range of speakers designed for cost-effective installations where product simplicity and solid acoustic performance is required.
Features
- C-CAM mid-bass drivers
- C-CAM gold dome Tweeters with UD Waveguide I
- Tri-Grip II legs
- Quik-Link
-
Tier 2
Where enhanced performance is required, Tier 2 models offer a significant step up over Tier 1 models, both in terms of acoustics and features.
Features
- Boundary correction, mid/high frequency & cut/boost
- C-CAM RST II mid-bass drivers
- C-CAM gold dome Tweeters with UD Waveguide II
- RST II bass drivers
- Tri-Grip II legs
- Quik-Link
- Rotating mid-pod
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Tier 3
Tier 3 offers discreet, premium high-fidelity sound, coupled with technological innovations that offer enhanced flexibility of speaker placement.
Features
- Boundary correction, mid/high frequency & cut/boost
- IDC II coaxial mid/tweeter drivers
- RDT III bass drivers
- MPD II transducer
- Tri-Grip II legs
- Quik-Link
- Rotating mid-pod

Creator Series - In-Ceiling models
The in-ceiling loudspeaker sits at the heart of architectural sound; its ability to fill a room with wonderful sound while remaining virtually invisible delivers on the primary dream of a custom installation audio system. The Creator Series features small, medium and large in-ceiling models, allowing you to select the perfect array of speakers for your space.

Creator Series - In-Wall models
The in-wall loudspeaker is a versatile, high-performance tool that can add localised quality to any custom installation. The Creator Series in-wall models allow you to create areas of high-performance sound, most usually in a dedicated home cinema space, that rival that of stand-alone loudspeakers, while remaining virtually invisible.

Mount Boxes
The On-Ceiling and On-Wall Creator Series Mount Boxes allow simple delivery of audio in spaces where fully integrated, built-in solutions aren’t an option—delivering high-fidelity sound without restrictions.
Quik-Link
Our new innovative Quik-Link terminal revolutionises speed of installation. With Quik-Link you can make cable connections up the ladder at pre-installation stage. Once the installation is complete, the terminal, which is now connected with the speaker cables, magnetically snaps and locks into place on the rear of the speaker as you place the speaker into ceiling or wall. It’s that easy.
Tri Grip II
Tri-Grip II is a new dog-leg mechanism that is considerably stronger and more reliable than the previous generation, meaning both speaker placement and extraction could not be simpler.

RDT III
Rigid Diaphragm Technology III (RDT III) is a composite ‘sandwich’ structure made from ultra-thin low-mass skins, bonded to a honeycomb Nomex® core material. It is very light and very strong, meaning that it can respond with great speed without bending - just like a perfect piston.
MPD II
Tier 3 In-Wall speakers feature an MPD II high-frequency transducer, developed for the THX Certified Ultra Cinergy range. The precision specification of the Micro Pleated Diaphragm technology is designed to produce accurate, lifelike sound without any distortion.

Accessories
From installation to finishing touches, you’ll find everything you need to accessorise your Monitor Audio listening experience with our selection of Pre-Construction Brackets, Speaker Back Boxes and Speaker Grilles.
- Choosing a selection results in a full page refresh.
