FINKTEAM’s WM-4 is a three-way, twin-cabinet design featuring a 15-inch bass driver, twin 5.5- inch flat-diaphragm midrange drivers and an AMT tweeter. The two midrange drivers and tweeter, arranged as an MTM (D’Appolito) array, are housed in the top cabinet which is faceted to reduce diffraction effects. The bass driver occupies the lower cabinet and is reflex loaded via a large forward-firing port.
The WM-4 combines wide bandwidth (30Hz- 30kHz) with high sensitivity (90dB) but is easy to drive, with an average impedance of around 6 ohms and low impedance phase angles. To make the WM-4 better adapted to use with some valve amplifiers, an optional impedance smoother is provided which reduces the impedance variation and hence the frequency response errors that result from high amplifier output impedance.