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KM 30
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| 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 ) . |
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| 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 |
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Hole diametre = 270 7 screws ø 5 at 54,3 ° on r = 144 Net weight = 9,3 kg Packed weight = 13,5 kg |
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| 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 . |