Crown International
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: 574-294-8200
FAX: 574-294-8FAX
www.crownaudio.com
4/05 138407-1
Specifications subject to change without prior notice. Latest
information available at www.crownaudio.com.
Crown and Crown Audio are registered trademarks, and DBC is a
trademark of Crown International, Inc. Other trademarks are the
property of their respective owners. Printed in U.S.A.
© 2005 Crown Audio®, Inc.
DBC Network Bridge Architectural & Engineering Specifications
DBC™ NETWORK BRIDGE
The Crown®DBC Network Bridge shall be a device that distributes multiple
channels of digital audio over standard fast Ethernet hardware and cabling for
use in traditional, e-cinema and d-cinema applications.The DBC Bridge shall
accept standard analog and/or AES digital audio and CobraNet digital channels
from other Cinema processors (Dolby®, DTS®), Cinema Servers, or Alternative
Content Media Players; and shall bridge (route) them to a Crown DBC network.
The DBC network (fed by the DBC Bridge) shall distribute the digital audio and
system-wide control protocol to Crown amplifiers. The DBC Bridge also shall
provide the necessary system equalization, which is stored and recalled via a
series of presets for use in both feature film and alternative content program-
ming.
The DBC Network Bridge shall accept 8 inputs (7.1 surround) via one of the
following formats: Analog, AES/EBU, or CobraNet. The device shall provide
full 32-channel CobraNet digital audio transmit/receive capability. The device
shall include an enhanced matrix mixer capable of full 8x32 crosspoint matrix
mixing, 24-bit/48 kHz converters, studio-grade DSP with multiple filter banks
for each channel (up to 256 filters).
The DBC Network Bridge shall be able to store, label and recall 32 presets, 32
scenes, and 32 events. The device shall provide analog monitoring of cinema
processor inputs, pre-amp, or post-amp signals; a multiple-function control
port for third-party automation/control, an internal clock/calendar for schedul-
ing events, auto leveling functions for dynamic volume control of auditoriums
or lobby, and ambient leveling functions for maintaining maximum signal-to-
noise ratio.
The DBC Network Bridge shall perform to the following specifications:
Analog Auxiliary Input Gain Range : +20dB to –12dB (add 25 dB for mic set-
ting). Maximum Input Level: +32dBu (line) or +7dBu (mic). Input Impedance:
20 kilohms balanced, 10 kilohms unbalanced. Digital Sampling: 24-bit, 48 kHz.
Dynamic Range: >108 dB (A-weighted, 20Hz-20kHz). Frequency Response:
+ 0.5dB, 20 Hz-20 kHz. Common Mode Rejection: 50dB at 60Hz (typical).
Crosstalk: > 80dB at 10kHz. Total Harmonic Distortion: <0.05% THD+N (1kHz,
0dBu). Output Impedance: 100 ohms balanced, 50 ohms unbalanced.
Maximum Output Level: +20dBu. Latency (analog inputs): Analog: 1.13 mS.
2.28 mS at 48 kHz. A/D, D/A Converters: 24-bit 96 kHz Cirrus Logic. Digital
Input: AES/EBU, 24-bit, 32-96 kHz, onboard sample rate converter. Network:
Onboard TCP/IQ, compatible with standard 100Mb Ethernet hardware. DSP:
24-bit conversion with 32-bit, floating-point DSP processing.
The DBC Network Bridge shall provide a Control Port with the following
specifications: Power Supply: +5 VDC and +10 VDC output. Total output current
1A. Monitor Output Logic Low: < 0.1V. Monitor Output Logic High: 10 V (via
internal pull-up). Output current shall be limited to 10 mA max per pin. Input
Impedance: > 50 kilohms. Input Logic Low: < 0.5 V. Input Logic High: > 5V.
Input Analog Range: 0 to 10 V (for inputs 9-16 only). Max Input Voltage: 25 V.
The DBC Network Brige shall have the following Power specifications:
Required AC Mains: Universal AC input, operating from 100 VAC to 240 VAC at
50/60 Hz, 24W nominal. AC Line Connector: 15A IEC AC power inlet.
Front panel controls and indicators shall include the following:
Power Indicator: Blue LED shows that the unit is plugged in and AC power is
being supplied. The unit shall not have a power on/off switch. Data indicator:
Amber LED flashes when commands addressed to the DBC Bridge are received.
AES/EBU Indicator: Amber LED illuminates when the unit is switched to accept
AES digital inputs. Input Display: An eight-segment LED display matrix shows
input signal presence for all eight analog or digital inputs. Output Display: An
eight-segment LED display matrix shows output signals for all eight surround
channels. Next/Previous Buttons: These two buttons scroll through parameters
in each menu. Menu/Select Button: Scrolls through the menus of IQ address,
inputs, presets, scenes, and firmware information; also used to select a param-
eter that is found by the Next/Prev buttons. LCD Control Screen: LCD digital
display shows information about the currently selected IQ address, inputs,
presets, scenes, and firmware information.
Back panel connectors and controls shall include the following: Analog Audio
Input: DB25 female connector accepts eight balanced analog line-level analog
inputs. Pinout matches Dolby CP-650 analog output. AES/EBU Digital Audio
Input: DB25 female connector accepts eight AES3 digital audio signals. Pinout
matches Dolby #778 AES input /output card for CP-650. Aux Inputs: 2 female
XLR balanced inputs for speech reinforcement or announcements. Switchable
between mic, line, and mic with phantom power. Primary Network Connec-
tor: RJ45 connector for primary CobraNet network connections (100 Mbit
CAT5), supports TCP/IQ communications with CobraNet digital audio channels.
Secondary Network Connector: RJ45 connector for secondary (redundant or
backup) CobraNet network connections (100 Mbit CAT5), supports TCP/IQ
communications with CobraNet digital audio channels. Multifunction Control
Port: One DB37M for analog inputs, digital inputs, +5VDC, +10VDC and ground.
8 input-switch closures, 8 analog 0-10VDC inputs, 16 output contact closures,
+10VDC power source (1A), GND (1A+). IEC AC Power Inlet: Accepts an IEC AC
power cord. The DBC Network Bridge shall have a universal power supply, and
may be operated on AC line voltages from 100 VAC to 240 VAC at 50 Hz or 60
Hz. Monitor Out Connector: 3-pin Phoenix-type connector supplies a balanced
analog line-level output signal which can feed a powered monitor loudspeaker.
Aux Input Mic/Line/Phantom Switch: Each input has a three-position “M L P”
selector switch for mic level, line level, or mic level with phantom power. Aux
Input Level Controls: Screwdriver-set, calibrated gain potentiometer (one per
channel) for adjusting the input gain to the input signal level. Control range is
from -12 dB to +20 dB.
The device shall be convection cooled with no vents and no fans.
The dimensions of the device shall be 19 in. (48.3 cm) W x 1.75 in. (4.4 cm) H
x 16 in. (40.6 cm) D. The net weight of the device shall be 15.3 lbs (6.9 kg).
The device shall be designated the Crown DBC Network Bridge.
