Altec Lansing 3124 User Manual

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DESCRIPTION

The Altec Lansing- Model 3124 12-inch low­frequency 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 Thiele­Small 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 die­cast frame. The ferrite magnet structure coupled
with an exceptionally high power voice coil pro
vides low distortion even at very high sound
pressure levels.

3124 LOW FREQUENCY

LOUDSPEAKER

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
40-400 Hz): 113 dB at 4 feet

Impedance:
Recommended System:

Maximum Excursion
Before Damage

(Peak to Peak):

Voice Coil Diameter:
Thiele-Small Parameters—

Free-Air Resonance (fs):
Equivalent Volume

Compliance (Vas):
Total Q (Qts):
Electrical Q (Qes): 0.32
Mechanical Q (Qms):
Reference Efficiency (j;o):1.1%
D. C. Resistance (Re):
Peak Linear
Displacement (Xmax):
Peak Linear Volume

Displacement (Vd):
Effective Surface Area

of Driver Diagram (So):

Additional Parameters—

Effective Piston
Diameter:

Voice Coil Inductance:
BL Factor:
Magnet Type:
Magnet Weight:
Flux Density:

Mounting Information —

Baffle Opening
Diameter:

Mounting Bolt Circle
Diameter:

Loudspeaker Depth
(front mounting):

Loudspeaker Depth
(rear mounting):

Weight:

*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.

12"

500 watts program material
250 watts continuous pink
noise band-limited

30-2000

91 dB at 4 feet
93 dB at 1 meter

115 dB at 1 meter

8 ohms nominal

8124 (3 ft^)
System F3: 40 Hz

1.44 in.
3 in.

26 Hz

6.6 ft’

0.27

2.92

6.4 ohms

0.25 in.

19.6 in.’

78.5 in.’

10.0 in.

4.3 mH

15.3
ferrite
48 oz.
9,000 gauss

11 Vs" (28.26 cm)

11%" (29.52 cm)

5" (12.7 cm)

53/4" (14.6 cm)

18.5 lbs (8.4 kg)

(A) Loudspeaker Diameter: MVa" (31.12 cm)

(Bf) Depth When Front Mounted: 5" (12.7 cm)

(Br) Depth When Rear Mounted: Sy4" (14.6 cm)

ARCHITECT'S AND ENGINEER'S SPECIFICATIONS

The low frequency loudspeaker shall meet the fol

lowing criteria. AES power rating, up to 250 watts
of band-limited pink noise (40-400 Hz). Frequency
response, uniform from 30-2000 Hz when mounted
in a suitable enclosure. Pressure Sensitivity, 93 dB SPL
when measured at 1 meter on axis from front edge of
Altec Model 8124 Loudspeaker System (containing
one model 3124 speaker) with one watt of band

LITHO IN U.S.A. 1283-5M

LOUDSPEAKER MOUNTING DIMENSIONS

(C) Baffle Opening Diameter: 11’A" (28.26 cm)
(D) Bolt Circle Diameter: 11 Vs" (29.52 cm)
(E) Bolt Hole Slots: 'A" (0.64 cm) x (0.87 cm);

8 slots spaced 45° apart.

limited pink noise from 100-1000 Hz (Ref.: 0.0002
dyne/cm'). Minimum impedance, 8 ohms. Nominal
free-air LF cone resonance, 26 Hz. The voice coil shall
be 3" in diameter, driven by a ferrite magnet having
a flux density of 9,000 gauss. Dimensions, 12" diam­eterx 5" deep. Weight, 18.5 pounds.

The low frequency loudspeaker shall be the ALTEC

LANSING Model 3124.

А1_л"е:с:

L-AISISirsIG

1250 NORTH RED GUM STREET, ANAHEIM, CALIFORNIA 92806

ALTEC CORPORATION

Revision 3

AL-2415

42-02-024897