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Ì2Ì8A Muskal Instrument Speaker System I2I8A
Designed to meet the high performance standards of professional musicians, the ALTEC
1218A Musical Instrument Speaker System is rated to handle up to 50 watts of continuous
power and produces an extremely wide angle of coverage to afford maximum listening
enjoyment.
All components of the 1218A speaker system are carefully matched:
421A-type (422-8Z) Low-Frequency Musical Instrument Loudspeaker . . . 15" woofer
for high efficiency in reproducing bass and mid-bass sounds. 3" edge-wound voice coil,
rigid cast aluminum frame, powerful magnet.
8118 High-Frequency Sectoral Horn
from 800 Hz to beyond audibility.
807-8Z High-Frequency Driver . . . has an extremely rugged voice coil and diaphragm
assembly that handles much more power than conventional drivers. Uniform response
from 500 to 20,000 Hz.
N809-8A Dividing Network ... precision two-section crossover network with HF attenua
tion control, 800 Hz crossover and 12 dB/octave slope. Two phone-jack paralleled inputs.
A sturdy wooden bass reflex enclosure provides excellent bass and mid-bass reproduction.
The 1218A has a resilient epoxy spatter finish. It is portable and is fitted with a tubular
swivel mount, recessed die-cast handles and removable latching front cover. Standard phone
jacks for cable connections and a 50-foot cable accessory make handling and setup easy.
massive, cast aluminum, 25" wide. Operates
Detailed specifications and descriptions of 1218A system components can be obtained from
their respective ALTEC catalog sheets and brochures.
1515 S. Manchester Ave., Anaheim, Calif. 92803
A DIVISION OF ALTEC CORPORATION
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ALTEC 1218A
SPECIFICATIONS
Type:
Power Rating:
Input Impedance:
Pressure Sensitivity:
Frequency Response:
Crossover Frequency:
Input Connection:
Portable two-way musical instrument speaker system with wideangle coverage
50 watts with high-frequency attenuator in the '0' position. 100
watts power handling capacity may be obtained by setting the HF
attenuator to the '6' position.
8 ohms
102 dB SPL measured at 4' on axis with 1 watt input of pink
noise from 500 Hz to 3000 Hz. Equal to E.I.A. rating of 55 dB
with 1 mW input (Ref.: 0.0002 dyne/cm^).
119 dB SPL measured at 4' on axis with 50 watts input (full
power rating) of pink noise from 500 Hz to 3000 Hz (Ref.:
0.0(K)2 dyne/cm^).
35 Hz to 20 kHz (see Figure 1)
800 Hz, full range dual LC network, 12 dB/octave slope
Two standard phone jacks
Components:
Enclosure:
Dimensions:
Weight:
Accessory:
1 ALTEC 422-8Z Low-Frequency Musical Instrument Loud
speaker (421A type)
1 ALTEC 81 IB High-Frequency Sectoral Horn
1 ALTEC 807-8Z High-Frequency Driver
1 ALTEC N809-8A Dividing Network (see Figure 2)
Bass reflex type, %-inch plywood construction with resilient
epoxy spatter finish. Fitted with tubular swivel mount, recessed
die-cast handles and removable latching front cover (see Figure 3).
30’/4" H X 28" W X 19y4" D
(76.84 cm H X 71.12 cm W x 50.17 cm D)
110 pounds (49.81 kg)
50', 2-conductor cable with standard phone plug on each end
t
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FREQUENCY IN HERTZ
Figure 1. 1218A Frequency Response
HIGH fiCQUENCV ATIENUAIiON
5
10 0
OO
AITPr dividing network
Figure 2. N809-8A Dividing Network
MO DEL
________
N80 R-8A
Figure 3. 1218A with Cover Installed
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ALTBC1218A
■ARCHITECT'S AND ENGINEER'S SPECIFICATIONS-
The speaker system shall be the two-way musical instrument type with a sturdy
plywood bass reflex enclosure, an 800 Hz dividing network, a 15-inch musical
instrument type LF loudspeaker, an HF driver and a cast aluminum 25-inch sectoral
horn having exponential expansion. A 50-foot, 2-conductor cable with standard
phone plug at each end shall be included with the system. The speaker system shall
be portable and shall meet the following performance criteria. Power rating, 50
watts. Input impedance, 8 ohms. Frequency response, 35 Hz to 20 kHz, Pressure
sensitivity; 102 dB SPL at 4 feet from 1 watt, 119 dB SPL at 4 feet from 50 watts
(equal to El A rating of 55 dB SPL at 30 feet from 1 milliwatt). Crossover frequency,
800 Hz. Crossover slope, 12 dB/octave. Dimensions, 30%" H x 28" W x 19%" D.
The speaker system shall have a resilient epoxy spatter finish, a tubular steel swivel
mount, recessed die-cast handles and removable latching front cover, and shall weigh
110 pounds.
The speaker system shall be the ALTEC Model 1218A Musical Instrument Speaker
System.
LITHO IN U.S.A. CP-173-5K
Specifications and components sub/ect to change without
notice. Overall performance will he maintained or improved.
AL-1804
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