Ashly SC77 User Manual

The SC-77 Stereo Three-Way Electronic Cross
over is designed to fill the needs of modem high
power sound systems, Crossover points and
rolloff ore continuously adjustable and individ
ual output stages with wide range gain adjust
ments will drive long cable runs and accurately
match any power amplifiers.

FEATURES:

• 12 dB per octave slopes

• Logical control layout

• Both the inputs and outputs can be used
balanced or unbalanced

• Flat summing

• Rugged 16 gauge steel chassis

• Peak overlaod warning lights

• In-phase outputs

• Our exclusive rolloff control to flatten
frequency response at the crossover point

• Optional 5-way mono operation

The SC-77 uses state variable filter circuits to perform
the frequency divisions. These filters provide simulta
neous low-pass and high-pass outputs. Twofiltersare
cascaded for three-way operation. Inverters are
Included on the mid outputs to keep everything in­phase. A "Q" adjustment (called rolloff) is included
for adjustment of frequency response In the cross
over region. This allows flat summing and in-phase
outputs.

The output stages have a wide range gain adjust

ment with a speciai feedback level control circuit to
maintain an optimum signal-to-noise ratio at any

setting.
A special electronic power monitor for the output

stages prevents turn-on transients without the use of
relays.

Both inputs and outputs can be used as balanced
or unbalanced and a peak overload circuit monitors
all critical points in the circuit to insure low-distortion
operation.

CONTROLS

Input level

crossover frequencies

(crossover point depth)

INPUT IMPEDANCE

OUTPUT IMPEDANCE

MAX. IN-OUT LEVEL

rolloff

output level

- oo - -I lOdB
48Hz-2.4kHz 480Hz-24kHz

1.5d8-12dB

- oo - -120dB
10k n balanced bridging

50 il unbalanced - terminate
with 600 il or more.
Turn on transient protected.

>20dBm

SPECIFICATIONS:

FREQUENCY RESPONSE

DISTORTION

HUM AND NOISE

(all outputs)

POWER

SIZE

SHIPPING WEIGHT

j..5dB 20Hz-20kHz (within
passband)

< .05% THD, +10dBV

20Hz-20kHz

-90dBV
Input and all outputs unity
gain, frequency and rolloff
at center rotation.

120 VAC. 50-60HZ, 5W
19"L X 31/2"H X 6"D
10 lbs.