Smaller version of the gargantuesque SB-M1 which previsible sold a little better... but not much at any rate: both the SB-M5 and its bigger SB-M3 sibling are quite, quite rare.

25cm Bass
1kg/14,5cm magnet with linear damper
high-efficiency polyimide voice coil and bonding

8cm Mid
wide-band piston with narrow gap
15,000Gauss

2,8cm High
wide-band piston / 35kHz response
16,500Gauss with square magnet for closer mounting to the mid driver
and magnetic fluid in magnetic gap
160W resistance

Powerful magnets, low-distortion network, square br port, thermal protection circuit with LED warning, L/R paired units and cool blue looks - "Digital-Ready" and in sync with the emerging 1980s which turned out to finally be... quite traditional.