User`s manual

iii
SPECIFICATIONS
Construction
Rack-mount chassis frame construction
with plug-in modules accessible behind
hinged front panel.
Signal connections
Standard pluggable screw-type terminal
blocks for audio signals and control
connections for projector changeover.
Mating halves supplied for each terminal
block. Automation connections via 15-way
D-type connector. Power supplied via two
outboard wall-mount transformers (one
main, one bypass).
Signal Inputs
a) Optical: two pairs of balanced inputs for
two projectors with stereo solar cells
(available from Dolby Laboratories
mounted on brackets for most projector
types).
b) Digital/Magnetic/Aux.: six inputs for
use with external magnetic preamplifier,
digital adapter, or auxiliary source, 300 mV
operating level (100mV for sub input).
c) Non sync: one pair of inputs for stereo
non sync source, 10 k nominal input
impedance, 30 mV maximum input
sensitivity. 2:4 decoder may be used to
generate ambient information for surround
speakers with stereo non sync sources.
d) Mic input: for dynamic microphone, 1k
nominal input impedance.
Signal outputs
150 ohm output impedance will drive any
load greater than 600 ohms. Maximum
output level, 2 V rms. Typical operating
level, 100 mV. Operating levels from 10 mV
to 200 mV may be accommodated.
Output for hearing-impaired
Center-weighted sum of L, C, R, S for
connection to auxiliary system for the
hearing-impaired. Output impedance 2.5k
ohms.
Optical preamplifier
Cat. No. 510 stereo preamplifier for two
projectors equipped with stereo solar cells.
Adjustable sin (x)/x slit-loss equalization
circuitry for flat response from virtually
any type of optical sound head.
Noise reduction
Two channels each for Dolby A-type and
Dolby SR soundtracks.
Four channel decoder
Cat. No. 511 2:4 decoder derives left, center,
right and surround channels from two
tracks on Dolby stereo optical prints.
Incorporates modified Dolby B-type noise
reduction and 10ms-150ms adjustable delay
line to optimize front-to-back surround
separation.
Loudspeaker equalization
a) Cat. No. 512 equalizers for left, center,
and right screen speakers provide ±10 dB
high- and low-frequency controls, plus 7
adjustable ±8 dB narrowband filters with
2/3 octave center frequencies from 63 Hz to
2 kHz. Adjusted by trained installers to
achieve standardized Dolby cinema
playback response.
b) Surround equalizer provides bass, mid-
frequency, and treble adjustments for left
and right surround channels,
c) 50 or 100 Hz crossover for subwoofer
channel.
Noise level
Typically -65 dB (CCIR/ARM weighted)
referenced to Dolby level.
Distortion
Any channel, 1 kHz: typically less than
0.15% at Dolby Level (50% modulation).
Ambient operating temperature
Up to 40˚C.
Dimensions
3 units high rack mounting: 178 x 483 mm
(7’x19'). Maximum projection behind
mounting surface: 280 mm (11'). Maximum
projection in front of mounting surface: 40
mm (1.6”’).
Weight
10.1 kgs (22.3 lbs).
Power Requirements
Normal supply 24VAC at 1A
Bypass supply 24VAC at 200mA
Fuse requirements
One slow-blow fuse: 20mm, 1.5 A. Spare
fuse provided.
Options
Cat. No. 515 second surround channel
module.
Cat. No. 516 remote fader.