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KM 30

KM 30 KM 30
First and only coaxial driver, as far as we know, that is also time aligned ( the 2 emissive centers are at the same place ) and that is not disturbed by recovering frequencies and a filter right on the most sensible zone for the human ear : 30 cm ( 12" ) high efficiency wide range unit non filtered : 97 db, paper cone, basket and ring made from bronze SN12 without lead, pole pieces made of very mild steel < 0,20% carbon in pot shape with central alnico 3SC ( = no magnetic looses ), plus piezo-electric tweeter featuring high impedance, into a bronze pot SN12, sharply filtered at 11 kHz and climbing over 30 kHz.

Each driver part is controlled and measured all along the manufacturing process . Each driver is put under a very serious pre-running and then measured in order to match pairs with max tolerance delta as 0,2gr. on mobile equipment mass, 0.1 Ohms on d.c. resistance , 2Hz on resonance frequency, is numbered and life guaranty ( first owner ) .

CHARACTERISTICS
ø voice coil = 35 mm
h = 8 mm 2 layers cu
M = 9,7 gr
dB = 97
G = 1,4T alnico Alcomax 3SC
Admissible power= 50 W
fs = 36 Hz
re = 13,8 Ohm
Qes = 0,62
Qms = 6,60
Qts = 0,59
Vas = 224 litre
Z = 16 Ohm
Zmin = 14,9 Ohm
Zmax = 125 Ohm
D = 234 mm
Ms = 23,2 gr
Le = 1,2 mH



KM 30 Analysis KM 30 Impédance KM 30 IMPULSE

Hole diametre = 270
7 screws ø 5 at 54,3 ° on r = 144
Net weight = 9,3 kg
Packed weight = 13,5 kg

These characteristics have an indicative value and are only the result we have in our deaf anechoic chamber from measuring equipment actually in our possession . It always must be kept in mind that the main ones , as the natural , equilibrium , musicality , cannot be described above but are only partly derived from them .