Theater - Audio Level Adjustments; Emergency Bypass Levels; Monitoring - Audio Mix Adjustments; System Calibration (Advanced) - QSC DCM series User Manual

Digital cinema monitor & crossover system

Table of Contents

1. Theater - audio level adjustments

The combination of QSC amplifiers and common speakers contained in the software database will

require little or no DCM adjustment! Transducer sensitivity imbalances within the speakers have

been compensated for by the factory recommended crossover settings. If you are using a pow-

ered subwoofer, or a speaker not contained in the factory supplied speaker database, you may

need to make level adjustments.

When the emergency bypass switch on the front panel of the DCM unit is activated, a passive

crossover (good old resistors and capacitors!) are used to divide the center channel audio signal

into either a 2-way signal (high frequency and low frequency), or a 3-way signal (high, mid, low).

The relative volumes of these signals can be adjusted on the rear panel of the DCM unit.

Feed pink noise into the center channel input, compare the center channel sound while in front

panel switch is in the normal position to the sound while in the bypassed position. While in the

bypassed position, adjust the potentiometers to most closely match the normal position sound.

The PC software allows balancing of the high/low or high/mid/low signals being fed to the front

panel monitor speaker. Input pink noise into all of the DCM input channels and select individual

channels using the DCM front panel buttons. Select the surround channels first to make a refer-

ence level (the standard DCM units contain no processing of these channels). Now select other

channels one at a time and balance these gain settings for a sound level similar to the surround

channels. NOTE: All adjustments are made in the DCM Commander software.

That is all the calibration necessary for a typical first theater installation. In Megaplex theater

installations with similar rooms (and similar equipment), these settings can be stored and quickly

downloaded to the DCM unit in each theater.

C. System Calibration (advanced)

The manufacturer of any loudspeaker will be able to supply you with recommended crossover set-

tings. The DCM offers additional filters (high pass, parametric EQ, screen EQ, and Horn EQ), driv-

er and channel delay, polarity, and gain adjustments which can be used as additional

compensation for speaker and installation characteristics.

WARNING: Inappropriate crossover settings can damage speakers!

Driver delay settings compensate for the physical displacement between transducer centers

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