dbx 160X Руководство по эксплуатации - Страница 6

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3.4 STEREO STRAPPING

Two channels of program material do not

necessarily constitute a stereo program. A stereo

program is one where the two channels are

recorded and/or mixed to create the illusion

of a sir)gle, unified "panorama" of sound. The

stability of the psychoacoustic "image'' of each

sound source within the stereo program depends

upon·its ability to maintain a specific phase and

amplitude relationship from left to right channel.

If two independent compressors are used

process the stereo program, a loud sound occurring

in one channel will cause a gain reduction only in

that channel. This gain reduction would cause the

perceived image of any sound spread between the

two channels to move toward the side which had

not been compressed, because the

spread

signal

would be momentarily softer in the compressed

channel. This can be avoided by linking the two

compressors in such a

way

that both channels

receive the same amount of compression -

amount equal to the maximum

''needed''

either channel at that moment. On the 160X,

this is accomplished by means of

the

STRAPPING jacks; a cable between these

jacks permits the RMS detectors of both

units

to "talk" to one another - but only when one

of the units' SLAVE buttons is

depressed.

Each

compressor then senses the incoming signal

level, which is compared to

the

threshold set on

the master (the unit whose SLAVE button is

not

depressed). If the comprealon

Is ;equired

either channel, both channels are a,bject to

compression - the same amount of it - so

the

stereo image remains stable.

When compressing

a stereo

program with a pair

of 160Xs, only the master unit controls need be

adjusted.

3.5 METER CALIBRATION

The INPUT/OUTPUT LEVEL DISPLAY in thr

160X is factory.calibrated

indicate "O" when

the signal level is +4 dBm (1.23 V) at either the

input or output of the 180X, depending on the

DISPLAY function switch position. (The

METER CALIBRATION control does not affect

the -GAIN CHANGE LEDs.)

recalibrate the

LEVEL DISPLAY, depress

the DISPLAY button

meter the INPUT LEVEL,

and

feed

1 kHz

signal at the selected

nominal

operating level

(the

level desired for a ''O dB"

meter indication)

the

180X's SIGNAL INPUT.

Then adjust

the

rear panel METER CALIBRA-

TION control until the meter indicates ''O dB."