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ALTEC.
771 B AND 771 BX
ELECTRONIC
CROSSOVER
BIAMPLIFIE
OPERATING
INSTRUCTIONS
ALTEC
7718
and
7718X
Electronic
Crossover 8iamplifiers
improve power handling
and reduce distortion
without
requiring
a high-power
amplifier
and
separate
crossover network.
FEATURES:
Electronic
Crossover
with
Separate
Power Amp I ifiers
Heavy LF Demands Do Not
Affect HF Performance
Full Amplifier
Power and
Efficiency
Versatile
Input Connections
Fail-Safe
Protection
for Output
Transistors
Ex
port
Model
ALTEC.
These ALTEC
biamplifiers
include electronic
crossover
circuitry and separate
low-frequency
(LF)and high-frequency
(HF)
amplifiers
ina single,
compact
package
that
can
be mounted directly
in the speaker
enclosure.
The elec-
tronic crossover
circuit divides
the input
signal
into separate
bass and
treble
channels.
A
60-watt
LF amplifier drives the
bass speaker
and a 30-watt
HF
amplifier
drives the horn-loaded
compression
driver.
Extreme LF power demand does not affect
HF reproduction
because
separate
amplifiers
drive the LF and HF spea kers.
The electronic
crossover is placed ahead of the dual power amplifiers
so that
ful I
biampl
ifier output is
distributed
to the
speakers.
Standard
input connections
are direct coupled.
Transformer
isolation
of the
input is accomplished
with
an optional
plug-in
transformer.
Input
inter-
connecti9n
phono jacks (7718 on I
y)
permit connecting
up
to
20 b iampl ifiers
into
a
single sound system.
AL TE C's Active Dissipation
Sensing Circuit
provides fa i I -safe protection
for
the
output
transistors.
The action of the sensing circuit
is immediate and
effectiveat
all frequencies
within
the passband of the biamplifier,
limiting
only that
portion of the
program
material
thatwould
damage or degrade
the
performance
of the
output transistors.
The ALTEC
7718X
8iamplifier
(export
model) is similar
to
the 7718, except
that
voltage
selection and fusing is provided for primary power.
The jack for
connecting
two
or
more biamplifiers
into multiple
systems
is
not
provided.
Specifications
and components
subject
to
cha
ng
e
without
notice
.
Ov erall p
er
formanc
e
will
be
maintain ed or improved.
1515 S. Manchester Ave., Anaheim, Calif. 92803
42-02-042741-01
Litho in USA
CP-472-2.5K
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