Altec Lansing 1209B User Manual

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№

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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

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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