dbx 160X Instruction Manual - Page 3

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1.2 160X FRONT PANEL

dbx

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1B0X

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Fif. 1·1 - Model 110X Fro,,t

Panel

A. BYPASS

SWITCH ANO INDICATOR

Depressing the BYPASS button creates a

"hard-wire

bypass" of the 160X's circuitry by

connecting the input directly to the output; the

LED above the switch turns ON in Bypass mode.

B. SLAVE

SWITCH ANO INDICATOR

Depressing the SLAVE button on one 160X

of a stereo pair determines that the

other

160X

will be the Master (the controlling unit). The LED

above the SLAVE button turns ON when the

160X is in SLAVE mode, indicating that the front

panel functions (with the exception of BYPASS

and DISPLAY select switches) are deactivated and

under control of the Master 160X. When neither

160X is in SLAVE mode, each will operate

normally

as a

mono compressor/limiter.

C. THRESHOLD

CONTROL

Adjusting this knob sets the threshold of

compression from -40 dBm (7

mV) to 20 dBm

(7.8 V).

In hard-knee compression mode, the thres•

hold is defined as that point above which the out•

put level no longer changes on

1 basis with

changes in the input level. In Over Easy mode, the

threshold of compression is defined as the

approximate middle of the Over Easy threshold

region, as shown

Figure

3-1.

0. OVER EASY SWITCH

Depres.

s ing this button changes the threshold

mode to dbx's Over Easy

characteristic.

and allows

the

middle (an1ber)

T~~RESl-iOLO LED to turn ON

1P.

1 1

thP.

signal

is in

the

Over Easy region. When

button is out

the

160X

oµerates as a hard-

ice

c:on1pressor /I

imiter.

E. THRESHOLD

INDICATORS

These three LEDs indicate the relationship

of the

input

signal level to the threshold of com-

prc~s

ion. The green

"BE

LOW" LED

when

the signal is below threshold and the red

"ABOVE"

l[ D is ON when the signal is above threshold.

When

the

160X is switched to Over Easy mode,

the

amber

LED is ON when the signal is in the

Over Easy region (Ref er to Figure 3-1 )

F. COMPRESSION RATIO

CONTROL

Rotating this control in a clockwise direction

increases the maximum amount of compression

from 1: 1 (no compression) up to infinity

1 (no

increase in

RMS

output regardless of input level

increases above threshold); further clockwise

rotation increases compression into the

INFINITY+ region, up to• maximum of-1:1

(i.e.,

d«reast1

in input level causes a 1

increase

in output level). In the INFINITY+ region,

the 160X inverts the program dynamics for

special effects.

G. OUTPUT

GAIN

CONTROL

Adjusting this control varies the amount of

fixed gain (up to ±20 dB) in the 160X's output

amplifier

stage.

The OUTPUT GAi N control does

not

interact with the threshold of compression.

DISPLAY FUNCTION

SWITCH AND

INDICATORS

Depressing this button causes the upper

LEO

array

display

the INPUT level to the 160X.

With the button out, the OUTPUT signal level

displayed.

pair of LEDs immediately above the

OISPLA Y switch indicates the selected display

•

status.

LEVEL

ANO GAIN

REDUCTION

DISPLAYS

The upper row of 19 LEDs displays either

the INPUT or OUTPUT level, as selected with the

DISPLAY switch. This display is factory set so that

is equivalent to +4 dBm input or output levf:I

( 1.23

rms), but may

reset with the rear panel

METER CALIBRATION trimmer. (See Section 3.5

for recalibration instructions.)

The lower

row

of 12 LEDs displays up to

40 dB of GAIN REDUCTION being caused by the

160X. (Fixed gain changes commanded by

the

OUTPUT GAi N control are not displayed by the

gain change LEDs but are reflected in the output

level display.)