H 21 LB 15 SAG

H21 LB 15  SAG H21 LB 15  SAG
High efficiency 21 cm ( 8" ) wide range unit, paper cone, basket and ring = bronze without lead SN12 , pole pieces made of very mild steel < 0.20 % carbon in a pot shape with central ALNICO 3SC magnet : all fields is in the gap and magnetically proof ( TV… )
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 0,1gr. on mobile equipment mass, 0.1 Ohms on d.c. resistance, 1Hz on resonance frequency, is numbered and life guaranty ( first owner ).


*This unit characteristics are the same as H21lb15 exeption of voice made of silver wire insulated with 15 micrometer silk. This avoids nearly totaly the production of MDI ( Micro Discharges of Interface ) and other perturbations.

CHARACTERISTICS
ø voice coil = 25 mm
h = 8 mm 2 layers silk silver
M = 5,9 gr
dB = 98
G = 1,4T alnico Alcomax 3SC
Admissible power = 15 W rms
fs = 40 Hz
re = 12,8 Ohm
Qes = 0,65
Qms = 6,10
Qts = 0,59
Vas = 97 litre
Z = 15 Ohm
Zmin = 14,4 Ohm
Zmax = 155 Ohm
D = 176 mm
Ms = 9,4 gr
Le = 1,1 mH

clio analisys Impedance Impulse response

Hole diametre= 202
5 screws ø 5 at 72° on r = 108
Net weight = 4,2 kg
Packet weight = 6 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.