Parker Duo

The stand-mount that opened the Parker series in 2020, and the step where Marten drops the port. Instead of a tuned tunnel there is a 229 mm aluminium passive radiator on the back, driven by the air the 190 mm ceramic cone moves inside a sealed box — no port noise, no chuffing, and a low end that stops at 36 Hz in a cabinet 42 cm tall. The tweeter is a 25 mm pure ceramic dome, and it is the same physical unit the Diamond edition replaces with a diamond one, so the cabinet and crossover carry a 40 kHz ceiling either way. The box is 35 mm M-board with tapered sides, 22 cm across at one end and 28 at the other, which kills the parallel walls a rectangular box would have. Crossover at 2.2 kHz in what Marten calls multi-diverse order, on polypropylene capacitors and copper-foil inductors, with Jorma wiring and WBT Nextgen terminals. Stand optional.