Compact neodymium magnet tweeter for high quality speaker design in small cabinets. A critically designed aluminium/magnesium alloy diaphragm behaves like a piston throughout the audible frequency range, resulting in a good dispersion also above 10kHz. A wide roll surround together with a double chamber magnet system results in a low fundamental frequency. A critically designed diffusor compensates for a slight axial roll off towards 20 kHz and reduces resonances above 20kHz. The construction of the magnet system results in very low magnetic stray fi elds since the magnet is enclosed in a soft steel housing. Thus, this unit is immediately ready for Audio-video systems. The voice coil is immersed in magnetic fluid, allowing high power handling capacity and simplifi ed crossover design.