Marten’s Coltrane Supreme 2
Despite having a multiplicity of drive-unitsone 20mm diamond supertweeter, one 51mm diamond tweeter, one ceramic-cone midrange unit, one 8” laminated aluminum-sandwich woofer, six 8” laminated aluminum-sandwich woofers, and six 11” passive radiatorsall crossed-over with first-order filters, this enormous speaker, driven by Pass Labs Xs-300 two-chassis monoblocks, spoke with one voice, perhaps I was told, because all the driver’s acoustic centers are in the same plane.
The midrange driver (above, sourced, I understood from Accuton but sadly broken by a previous visitor to the suite) has a concave cone profile to move its acoustic center forward to coincide with those of the tweeter and supertweeter. Note how the annular magnet leaves the rear of the diaphragm complete free from acoustic obstructions, something this driver shares with the Vivid drive-units.
Wonder if Henrik Lundqvist would like a pair!