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400 GMF Pro
Bass drive unit.
This loudspeaker of low register with high efficiency (98.5 dB) is intended for wiring for sound.

Its engine made up of a ferrite of 220 mm makes it possible to obtain the field necessary to reach such a sensitivity.

These qualities enable him to be directly coupled with our 1 inch horn. Installed in a bassreflex, crossed to 1200 Hz, with a filtering with 18 dB/oct for the horn and 12 dB/oct for the 400, the response curve will be linear with ± 2 dB until the final frequency of the 1 inch driver.
Mesurements curves
400 GMF Pro Specifications

Efficiency 1 W/1m at Fs

98 dB Fs 32 Hz
Frequency response 8 ohms Re 6.5 ohms
Impedance 32 à 4kHz Qts 0.26

Power max. RMS

120 W Qe 0.27
Weight 10.7 kg Qm 9.5
Suspension Toile Vas 370
Linear excursion 10 mm Bl 18

Magnet diameter

220 mm Cms
0.36
Magnetic field 1.8 T Mms 70 g

Diameter HP

404 mm Sd
855 cm²

Frame thickness

Alu 10mm    
Diameter fixation holes 382 mm    

Diameter drilling enclosure

358 mm    

Depth HP

165 mm