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1209B Powered Speaker System
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1209B
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ALTEC has combined the 771B Electronic Crossover Biamplifier with the 1208B Nonpowered Speaker
System to provide ALTEC's 1209B Powered Speaker System — a superb speaker system to make your
happening happen — one that projects sound to the farthest listener.
Horns control wide-angle distribution of up to 90 watts of continuous program material for the entire
audio spectrum. Since all frequencies are reproduced by horns, off-axis frequency response is almost
identical to on-axis response. Listeners in side and rear seats hear the same natural sound as those in frontrow-center seats.
All components of the 1209B system are carefully matched:
421A Low-Frequency Musical Instrument Loudspeaker . . . 15" woofer for high efficiency in reproduc
ing bass and mid-bass sounds. 3" edge-wound aluminum ribbon voice coil, rigid cast aluminum frame,
1714 pound magnet assembly.
51 IB High-Frequency Sectoral Horn . . . massive, cast aluminum, 25" wide. Operates from 500 Hz to
beyond audibility.
808-8A High-Frequency Driver . . . has an extremely rugged voice coil and diaphragm assembly that
handles much more power than conventional drivers. Smooth response from 500 to 20,000 Hz.
771B Electronic Crossover Biamplifier . . . two separate power amplifiers that faithfully reproduce all
frequencies ... a 60-watt power amplifier for low frequencies from 35 to 500 Hz and a 30-watt power
amplifier for mid and high frequencies from 500 to 20,000 Hz.
828B Low-Frequency Horn . . . sturdy %" plywood front-loaded exponential horn provides excellent
bass and mid-bass reproduction and controlled sound projection.
The 1209B components are shipped separately, in kit form, ready to assemble. All that is needed is a
screwdriver — and 30 minutes. Assemble it with the sectoral horn on top or inside the cabinet ... it
sounds great either way.
19№
hBI
Detailed specifications and descriptions of 1209B 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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ALTEC1209B
Type:
Power Output —
Bass Amplifier:
Treble Amplifier:
Power Requirements:
Input Sensitivity (for
Rated Output with
Full Boost):
Pressure Sensitivity:
Acoustic Output at
Maximum Gain
Settings —
Direct Input (No
T ransformer):
High-Level BalancedLine Matched Input
(15335 Transformer)
High-Level Balanced-
Line Bridging Input
(15095A
Transformer):
1209B SPECIFICATIONS
Biamplified powered speak
er system with wide-angle
coverage
60 watts
30 watts
120V, 50/60 Hz -
17W at zero signal
90W at SOW output
135W at 90W output
0.5V rms direct
0.5V rms with 15335 Line
Matching Transformer
(high-level balanced-line
matched input)
0.1V rms with 15095A
Line Bridging Transformer
(high-level balanced-line
bridging input)
103 dB SPL measured at
4' on axis with 1 watt in
put of pink noise from
100 Hz to 10 kHz (Ref.:
0.0002 dyne/cm2). Equal
to El A rating of 56 dB
SPL measured at 30' on
axis with 1 milliwatt input.
118.0 dB SPL measured at
4' on axis with 0.5V rms
input of pink noise from
500 Hz to 3000 Hz (Ref.:
0.0002 dyne/cm2)
118.0 dB SPL measured at
4' on axis with 0.5V rms
input of pink noise from
500 Hz to 3000 Hz (Ref.:
0.0002 dyne/cm2)
118.0 dB SPL measured at
4' on axis with 0.1V rms
input of pink noise from
500 Hz to 3000 Hz (Ref.:
0.0002 dyne/cm2)
Input Impedance:
Frequency Response:
Crossover Frequency:
Input Connections:
Distribution Pattern:
Components:
Dimensions —
HF Horn Externally
Mounted:
HF Horn Internally
Moutned:
Finish:
Weight:
15.000 ohms direct
15.000 ohms with 15335
transformer
600 ohms with 15095A
transformer
35 Hz to 20 kHz, normal
ized composite output (see
Figure 1)
500 Hz with 12 dB/octave
slope
2 standard %" diameter
phone jacks, paralleled
— or —
Barrier-type terminal board
for 600-ohm applications
(requires transformer acces
sory module to be installed
in biamplifier)
90° horizontal x 40°
vertical
1 ALTEC 421A Low-Fre
quency Musical Instru
ment Loudspeaker
1 ALTEC 51 IB High-Fre
quency Sectoral Horn
1 ALTEC 808-8A High-
Frequency Driver
1 ALTEC 771B Electronic
Crossover Biamplifier
1 ALTEC 828B Low-Fre
quency Horn
1 ALTEC 50', 2-conductor
cable with standard %"
diameter phone plug on
each end
54%" H X 30" W X 24" D
(137.80 cm H X 76.20 cm
Wx 60.96 cm D)
42" H X 30" W X 24" D
(106.68 cm H X 76.20 cm
Wx 60.96 cmD)
Theatre gray enamel
180 pounds (81.50 kg)
Figure 1. Frequency Response Measured at 4' on Axis with 1 Watt Input
%
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BIAMPLIFIER SPECIFICATIONS
Type:
Gain (with Full
Boost) —
Bass Amplifier:
Treble Amplifier:
Input Sensitivity (for
Rated Output with
Full Boost:
Power Output —
Bass Amplifier:
Treble Amplifier:
Total Harmonic
Distortion (THD):
IM Distortion:
Biamplifier with electronic
crossover
52 dB with 15335 Line
Matching Transformer
66 dB with 15095A Line
Bridging T ransformer
49 dB with 15335 Line
Matching Transformer
63 dB with 15095A Line
Bridging Transformer
0.5V rms direct
0.5V rms with 15335 Line
Matching Transformer
(high-level balanced-line
matched input)
0.1V rms with 15095A
Line Bridging Transformer
(high-level balanced-line
bridging input)
60 watts at less than 0.5%
THD
30 watts at less than 0.5%
THD
Less than 0.5% at rated
power, 20 Hz to 20 kHz
Unmeasurable by normal
IHF method
Damping Factor:
Noise Level:
Controls:
Power Requirements;
Dimensions
Overall:
Panel Cutout;
Weight:
25
80 dB below rated output
1 BASS GAIN CONTROL,
continuously variable, -^6
dB to -15 dB
1 TREBLE GAIN CON
TROL, continuously vari
able, -t6 dB to -15 dB
1 ELECTRONIC CROSS
OVER FREQUENCY
switch, 500/800/1500
Hz. Use 500 Hz for
1209B.
1 POWER switch
1 PRESS TO RESET push
button (circuit breaker)
(771B only)
1 VOLTAGE SELECT
switch (771BX only)
120V ac, 50/60 Hz -
17W at zero signal
90W at SOW output
135W at 90W output
6-1/2"Hx9-7/8"Wx9"D
(16.51 cm H X 25.08 cm W
X 22.86 cm D)
5-1/2" Hx 9-1/2" W
(13.97 cm H X 24.13 cm
W)
16 pounds (7.26 kg)
Crossover Frequency:
Frequency Response:
Input Impedance:
Load Impedance:
500, 800 or 1500 Hz with
12 dB/octave slope
±1 dB from 20 Hz to 20
kHz (normalized composite
output)
15.000 ohms direct
600 ohms with 15095A
transformer
15.000 ohms with 15335
transformer
8 ohms nominal for each
amplifier
Color:
Optional Accessories:
Black
ALTEC 15095A Line
Bridging T ransformer
ALTEC 15335 Line Match
ing Transformer
NOTE
ACCESSORIES MUST BE ORDERED
SEPARATELY.
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ALTEC 1209B
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The powered speaker system shall be the biamplified sound reinforcement type with
a sturdy %" plywood front-loaded LF exponential horn, a self-contained electronic
crossover biamplifier, a 15" musical instrument type LF loudspeaker, an HF driver
and a cast aluminum 25" sectoral HF horn having exponential expansion. A 50',
2-conductor cable with standard phone plug at each end shall be included with
the system.
The biamplifier shall contain a power supply capable of operating from a 120V ac,
50/60 Hz line, electronic crossover circuitry, separate LF and HF power amplifiers
and fail-safe protective circuitry for its output transistors. All circuitry in the bi
amplifier shall be solid state, with ail transistors and diodes of the silicon type. The
biamplifier shall meet the following performance criteria. Amplifier outputs; 60
watts bass, 30 watts treble. THD at full rated output, less than 0.5% at all frequencies
from 20 Hz to 20 kHz. Input sensitivity for rated output; 0.5V rms direct or with
line-matching transformer accessory, 0.1V rms with line-bridging transformer acces
sory. Input impedance; 15,000 ohms direct or with line-matching transformer acces
sory, 600 ohms with line-bridging transformer accessory. Load impedance, 8 ohms
nominal for each amplifier. Bass amplifier gain with full boost; 52 dB with line
matching transformer accessory, 66 dB with line-bridging transformer accessory.
Treble amplifier gain with full boost; 49 dB with line matching transformer acces
sory, 63 dB with line-bridging transformer accessory. Crossover frequency; 500,
800 or 1500 Hz (selectable) with 12 dB/octave crossover slope. Each channel shall
have a separate slide-type gain control, continuously variable from -i-6 dB to -15 dB.
The speaker system shall meet the following performance criteria. Frequency
response, 35 Hz to 20 kHz (normalized composite output). Pressure sensitivity,
103 dB SPL when measured at 4' on axis with 1 watt input of pink noise from 100
Hz to 10 kHz (Ref.: 0.0002 dyne/cm^). Equivalent El A rating, 56 dB SPL when
measured at 30' on axis with 1 milliwatt input. Acoustic output for rated power at
maximum gain settings — with direct input or high-level, balanced-line matched
input; 118.0 dB SPL when measured at 4' on axis with 0.5V rms input of pink
noise from 500 Hz to 3000 Hz (Ref.: 0.0002 dyne/cm^); with high-level, balanced-
line bridging input; 118.0 dB SPL when measured at 4' on axis with 0.1V rms input
of pink noise from 500 Hz to 3000 Hz (Ref.: 0.0002 dyne/cm^). Crossover fre
quency, 500 Hz with 12 dB/octave crossover slope. Horizontal distribution pattern,
uniform over 90°. Vertical distribution pattern, uniform over 40°. Dimensions;
54V4" H X 30" W X 24" D (HF horn externally mounted), 42" H x 30" W x 24" D
(HF horn internally mounted). The speaker system shall be finished in medium
gray enamel and shall weigh 180 pounds.
The speaker system shall be the ALTEC Model 1209B.
The 1209B shall be furnished with the following ALTEC accessories (select as
required and insert quantity):
.15095A Line Bridging Transformer_______15335 Line Matching Transformer
I
LITHO IN U.S.A. CP-273-5K
Specifications and components subject to change without
notice. Overall performance will he maintained or improved.
AL-1829
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