Each Westminster Royal SE speaker cabinet incorporates two 11-foot long rear folded horns - composed of 30 individual panels - that couple to the rear of the Dual Concentric™ drive unit and exit at the front cabinet corners (see the cutaway diagram of the cabinet above). The rear horn starts acoustic coupling to the drive unit at 300 Hz and provides low frequency response down to 18 Hz (-6 dB). The diagram below shows the acoustic path through the rear folded horns.

Above 300 Hz the low frequency drive unit is coupled to the front horn and provides frequency response in the range of 300 Hz to 1000 Hz. The high frequency compression driver component of the Dual Concentric™ drive unit provides frequency response from1000 Hz to 20000 Hz.The Westminster Royal SEs have entirely hand built compound horn-loaded birch plywood cabinets, each with a volume of 530 liters, and weigh a hefty 304 pounds per loudspeaker. Internally the cabinets are cross-braced for rigidity and heavily damped to eliminate resonances that could degrade sound quality.

The cabinets are finished in beautifully applied book-matched walnut veneer, solid walnut trim, and walnut burl highlights – the overall effect is quite stunning and it can be quite hard to take your eyes off the speakers when listening to music at first.

The cabinets are hand-waxed before leaving the finishing workshop, and Tannoy thoughtfully includes a specially formulated wax with the loudspeakers so new owners can keep them looking as good over time as they did when they were new.

The cabinets have casters on their bottoms to aid moving them into position, and believe me they are an absolute necessity when trying to move these behemoths. The speakers come with machined cups that the owner can place under the casters for additional isolation after the speakers’ final position is determined (which I haven’t got around to trying yet).