One important note: later dealer/archive listings for the D40R often show revised specs such as 20 Hz – 30 kHz, carbon-fibre 6.5″ drivers, 212 × 1200 × 342 mm, and 40 kg.
Those appear to describe the later ribbon-tweeter D40R listing, but the official ProAc 2012 catalogue page I found says 25 Hz – 30 kHz and Kevlar-cone drivers.
Official item
ProAc Response D40/R
Nominal impedance
4Ω
Recommended amplifiers
10–250 W
Frequency response
25 Hz – 30 kHz
Sensitivity
90 dB linear for 1 Watt at 1 metre
Bass drivers
2 × 6.5″ / 165 mm Studio Professional drive units, polymer-impregnated Kevlar cones
Mode
Floor standing with spikes
Grille
Acoustically transparent crimplene
Finish
Cherry
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