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 61/2” 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. FeaturesTypeCeiling Speaker Frequency Response100 - 30 Impedance8 OhmsSensitivity86 dBCut-Out-Size (Diameter)211 mmMounting Depth (assumes 13mm wall)50 mm