Altec Lansing 3124 User Manual
3124 low frequency loudspeaker
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3124 LOW FREQUENCY
LOUDSPEAKER
#
DESCRIPTION
The Altec Lansing- Model 3124 12-inch low-
frequency loudspeaker is part of Altec's new
generation of woofers. Each loudspeaker in this
line was engineered for a particular purpose.
The 3124 is designed specifically for the repro
duction of low frequencies with minimum
distortion in a compact enclosure.
When used as an integral component of the
8124 Loudspeaker System (3-cubic foot vented
enclosure), full capability of the 3124 is
achieved. This system provides a 3 dB down
frequency of 40 Hz with an optimum Thiele-
Small alignment.
Power capacity for the 3124 is 250 watts when
measured by the new AES standard specifica
tions. The 3124 will handle 500 watts of program
material when configured as the 8124 system, or
mounted in another suitable enclosure.
As with all Altec professional series woofers, the
3124 is built with a structurally reinforced die-
cast frame. The ferrite magnet structure coupled
with an exceptionally high power voice coil pro
vides low distortion even at very high sound
pressure levels.
SPECIFICATIONS
Frame Diameter:
‘Power Rating:
Frequency Response (Ftz):
Pressure Sensitivity
(1 watt (E X I) with pink
noise band-limited
100-1000 Hz):
“Maximum Sound
Pressure (Full power
(EVZ) with pink noise
band-limited
12
"
500 watts program material
250 watts continuous pink
noise band-limited
30-2000
91 dB at 4 feet
93 dB at 1 meter
40-400 Hz):
113 dB at 4 feet
115 dB at 1 meter
Impedance:
8
ohms nominal
Recommended System:
8124 (3 ft^)
System F
3
: 40 Hz
Maximum Excursion
Before Damage
(Peak to Peak):
1.44 in.
Voice Coil Diameter:
Thiele-Small Parameters—
3 in.
Free-Air Resonance (fs):
26 Hz
Equivalent Volume
Compliance (V
as
):
6.6
ft’
Total Q (Q
ts
):
0.27
Electrical Q (Q
es
):
0.32
Mechanical Q (Q
ms
):
2.92
Reference Efficiency (j;o):1.1%
D. C. Resistance (R
e
):
6.4 ohms
Peak Linear
Displacement (X
max
):
0.25 in.
Peak Linear Volume
Displacement (V
d
):
19.6 in.’
Effective Surface Area
of Driver Diagram (So):
78.5 in.’
Additional Parameters—
Effective Piston
Diameter:
10.0
in.
Voice Coil Inductance:
4.3 mH
BL Factor:
15.3
Magnet Type:
ferrite
Magnet Weight:
48 oz.
Flux Density:
Mounting Information —
9,000 gauss
Baffle Opening
Diameter:
11 Vs" (28.26 cm)
Mounting Bolt Circle
Diameter:
11%" (29.52 cm)
Loudspeaker Depth
(front mounting):
5" (12.7 cm)
Loudspeaker Depth
(rear mounting):
53
/
4
" (14.6 cm)
Weight:
18.5 lbs (8.4 kg)
*AES power rating measured E7Z where E — 45V, Z — 8ft,
band-limited 40-400 Hz.
(AES Recommended Practice Specification of Loudspeaker
Components Used in Professional Audio and Sound Rein
forcement. See J. Audio Eng. Soc., Vol. 30, No. 3, 1982 March.)
“In 8124X Enclosure.