Specifications

1-3
1.4 Specifications
Construction
Rack-mount chassis frame construction with plug-in modules accessible behind hinged front
panel.
Signal Connections
a. Standard 9 pin D-type connectors for Mic., Optical 1, Optical 2, Serial Data, and Motor Start
signals.
b. Standard 25 pin female D-type connectors for Digital Readers 1 and 2, Accessory Unit,
Automation connections, and 6 Channel Analog Inputs.
c. RCA type phono jacks for Non-sync 1 and 2.
d. Phoenix screw terminal connectors for processor outputs, bypass power, and remote control
connections.
Signal Inputs
a. 6 Channel: Six analog inputs for use with external magnetic preamplifier or external
processor, 300 mV operating level. (Requires optional Cat. No. 685.)
b. Optical: Two pairs of balanced inputs for two projectors with stereo solar cells (available from
Dolby Laboratories mounted on brackets for most projector types). Inputs compatible with LED
illuminated reverse-scan analog readers.
c. Non-sync: Two stereo inputs for non-sync sources. 50 kOhm input impedance, 50 mV to 2.5 V
sensitivity. 2:4 decoder may be used to decode Dolby Surround program sources.
d. Microphone: One balanced input for B-chain equalization P.A. mic. or multiplexer and one
unbalanced input for house announcement mic.
e. Dolby Digital Film Reader (CP500-D): Two inputs for connection to penthouse or inboard
readers.
Signal Outputs
47 ohms output impedance will drive any load greater than 600 ohms. Maximum output level, +20
dBu. Typical operating level, -10 dBu.
Operating levels from 25 mV to 0.7 V may be accommodated.
Output For Hearing-impaired System
Center-weighted sum of L, R, C for connection to auxiliary system for the hearing impaired.
Output impedance is 47 ohms with a fixed output level of 200 mV.
Optical Preamplifier
A Cat. No. 661 Optical Preamplifier accepts signals from two projectors with stereo solar cells.
Gain and slit loss adjustments are digitally controlled.
Noise Reduction
Two channels of Dolby A-type noise reduction and two channels of Dolby SR are provided as
standard. Up to six channels of A-type (CP500-70) and two additional channels of studio SR
(CP500-300) can be accommodated.
Four Channel Decoder
Cat. No. 675A DSP Module decodes left, center, right, and surround channels from the two optical
tracks on Dolby analog optical prints. Adjustable delay to optimize front to surround separation.