USL CM-8E - Manual (Page 10)

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
Bar graph display of all processor output or amplifier output levels (individual biamp
bands if crossover in processor or amplifier)

Streaming audio monitoring of selected audio channels or bands from processor or
amplifier
4.1.3 Audio Inputs and Outputs
The CM-8E simplifies the audio wiring of the booth. Audio from the cinema sound processor is
delivered over one or two (for biamp crossover in processor) standard 25 pin D connectors (DB-
25F). This eliminates the need for special cables or “break-out boards” for processors that have
outputs only on DB-25 connectors (such as the USL JSD-60 or the Dolby® CP750).
The CM-8E has standard DE-15F (also known as HD-15 or VGA) connectors to drive the
amplifiers. These standard connectors drive two channel amplifiers with balanced audio and
provide a “V-mon” return signal so the amplifier output can be monitored.
The CM-8E also has pluggable terminal blocks for the interface to the amplifiers. These are
used with amplifiers that do not have the DE-15 connectors. Terminals are provided for
balanced audio to each channel of each amplifier. Terminals also accept a sample of the
amplifier output so the output of the amplifier can be monitored.
4.1.4 Biamped Systems
The CM-8E supports the monitoring of systems with biamped screen channels (left, center, and
right). If the crossover is located before the monitor (either within the sound processor or
between the sound processor and the CM-8E), the CM-8E can monitor the total audio for each
channel as well as the individual bands for the screen channels. If the crossover is located after
the monitor (within the amplifiers or after the amplifiers), the CM-8E can monitor the full-
range audio from the processor and monitor the individual bands from the amplifiers or
crossover outputs. If the crossovers are located within the speakers, individual band samples
are generally not available for monitoring. In this case, the CM-8E is configured for no
crossover. When individual band monitoring is available, the front panel and web browser
buttons “scroll” through the bands. The sequence is off – both – low – high – off.
4.2 Block Diagrams
The following simplified block diagrams assist the user in understanding the signal flow within
the CM-8E. The CM-8E provides a direct connection from the sound processor to the
amplifiers, converting from DB-25 connectors to DE-15 and terminal block, with no intervening
electronics. The CM-8E does not affect the auditorium audio. Even if the CM-8E is turned off,
the show goes on! The CM-8E bridges each processor balanced audio line with a differential