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Dimensions: 297 x 169 x 4,8 mm
Frequency response: 400Hz- 26000Hz +/- 2dB
Resonance-frequency: 160 Hz
Efficiency: depends on bias voltage , 84dB-87dB / 1Watt / 1mtr.
Acoustical phase : constant between 400 and 26000 Hz, unit placed in a defined baffle.
Distortion: < 0,1 % / 1 Watt, < 0,8 % by max SPL ( 40Volt eff. 1 kHz burst via SU-130 )
Max SPL: 110dB / 1mtr (40 Volt eff.)
http://www.metrum-acoustics.nl/