l21rn4x/p h0956 woofer
H0956
Response curve recorded in anechoic chamber (Free-field, 4 pi radiation) with 0.5m microphone distance.
The loudspeaker is mounted in a closed box of 20 l net. volume
OF NORWAY
WOOFER
L21RN4X/P
The L21RN4X/P is an 8" cone driver with an injection moulded metal chassis
and developed for use as a high fidelity woofer unit.
The extremely stiff aluminum cone gives tremendous bass precision.
The cone and the low loss rubber surround show no sign of the familiar
500-1500 Hz cone edge resonance and distortion associated with soft
cones. On the other hand, the cone break up modes at higher frequencies
call for special attention in the crossover design work. A 4-layer, extremely
long, high temperature voice coil wound on an aluminium voice coil former
gives a high power handling capacity. The phase plug reduces compression
due to temperature variations in the voice coil, eliminates resonances that
would occur in the volume between the dust cap and the pole piece and
increases the power handling capacity. The large magnet system provides
reasonably high efficiency and low Q.
NOMINAL IMPEDANCE
RECOMMENDED FREQUENCY RANGE
8 Ohms
20-1000 Hz
VOICE COIL RESISTANCE
6.0
Ohms
VOICE COIL INDUCTANCE (EQUIVALENT)
2.7
mH
11.0
N/A
300
W
FORCE FACTOR
LONG TERM MAXIMUM POWER *
125
W
FREE AIR RESONANCE
CHARACTERISTIC SENSITIVITY ( 1W , 1m )
86.5
dB SPL
MOVING MASS
W
SHORT TERM MAXIMUM POWER *
OPERATING POWER ( 96 dB SPL , 1 m )
9.0
MARCH 02
W21-410
Hz
g
AIR LOAD MASS IN IEC BAFFLE
2.0
g
SUSPENSION COMPLIANCE
1.2
mm/N
VOICE COIL DIAMETER
39.0
mm
SUSPENSION MECHANICAL RESISTANCE
1.7
Ns/m
VOICE COIL HEIGHT
20.0
mm
EFFECTIVE PISTON AREA
220
sq.cm
6.0
mm
LINEAR COIL TRAVEL ( p-p )
14.0
mm
MAXIMUM COIL TRAVEL ( p-p)
21.0
mm
MAGNETIC GAP FLUX DENSITY
0.9
AIR GAP HEIGHT
T
MAGNET WEIGHT
0.64
Kg
TOTAL WEIGHT
2.00
Kg
VAS
QMS
QES
QTS
* = IEC 268-5
NOTES
23
40.0
77 Litres
3.61
0.30
0.28
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