Fixing a seminar room's echo

A university seminar room taken from 0.95s to 0.58s, matching BB93's classroom target by analogy -- with one wall left untouched. An illustrative worked example: a 7.5 x 6 x 3m seminar room (135m3) at 0.95 seconds reverberation, checked against BB93 Table 6's 0.6-second primary new-build limit by analogy (a university room, not a school, so treated as a reference point rather than a direct requirement). A full-height glass corridor wall was untouchable (fire strategy and listed-building constraints), so the fix concentrated on the other three surfaces: about 38m2 of ceiling rafts, 22m2 of fabric wall panels opposite the glass, and 45m2 of full carpet tiling. Result: 0.58 seconds -- inside the reference target despite the one wall left untreated.