dbx 160A Instructions Manual - Page 8

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dbx 160A COMPRESSOR / LIMITER

+20

+15

+10

-5

-10

-15

-15 -10

Figure 1: Hard Knee Compression Curve

and threshold LEDs

OUTPUT GAIN Control:

Adjust this control to vary the amount of fixed gain (up to +20dB) in the 160A's output amplifier stage. The OUTPUT

GAIN control does not interact with the threshold of compression.

DISPLAY Button and LED:

Depress this button to make the upper LED array display the INPUT LEVEL to the 160A. With the button out, the

OUTPUT LEVEL is displayed. A pair of LEDs immediately above the DISPLAY button indicates the selected display.

INPUT/OUTPUT LEVEL and GAIN REDUCTION Displays:

The upper row of 19 LEDs displays either the INPUT or OUTPUT LEVEL, as selected with the DISPLAY button. This

display is factory set so that 0dB is equivalent to +4dBu input or output level (1.23VRMS), but may be reset with the

rear panel METER CALIBRATION trimmer. (See following pages.)

The lower row of 12 LEDs displays up to 40dB of GAIN REDUCTION (although the 160A is actually capable of deliv-

ering up to 60dB of gain reduction). Note that fixed gain changes due to the OUTPUT GAIN control are not displayed

BYPASS

1 6 0 A

by the GAIN REDUCTION LEDs but are reflected in the OUTPUT LEVEL display.

85-3999-A 160AD front buyoff (5-20-98)

15 WATTS

A HARMAN INTERNATIONAL

COMPANY

SALT LAKE CITY, UTAH

MADE IN USA

100V

50/60Hz

MODEL 160A

120V

60Hz

COMPRESSOR/LIMITER

85-3998-A 160AD rear buyoff (5-20-98)

INPUT (BALANCED) Jacks:

The Tip/Ring/Sleeve phone jack and XLR-type jack are wired in parallel; either INPUT will accept an audio signal for

processing by the 160A. The phone jack accepts a standard TRS 1/4" phone plug for a balanced input source, or a 2-cir-

cuit (Tip/Sleeve) 1/4" phone plug for an unbalanced source. The XLR-type jack is wired pin 2 HOT (+), pin 3 COLD (-)

and pin 1 GROUND.

OUTPUT (BALANCED) Jack:

The 160A's OUTPUT (BALANCED) jack is driven by a floating active-balanced amplifier that simulates a true trans-

former output. This allows for the load at the OUTPUT to be either balanced with respect to ground, or single-ended to

ground (unbalanced) with very little difference (less than 0.5dB) in output level. For proper unbalanced operation, the

unused pin (either pin 2 or 3) MUST be grounded.

Nominal output signal level is +4dBu into 600Ω, and typical maximum output level is +25dBu into 600Ω. This jack

accepts XLR-type connectors, wired pin 2 HOT (+), pin 3 COLD (-), and pin 1 chassis ground.

For applications which require a "true" transformer output, an optional output transformer can be installed. Contact our

Customer Service Department at the phone number listed on the back cover for details. If outside the United States, con-

tact your dbx distributor.

OUTPUT (UNBAL) Jack:

The 160A has a separate single-ended (unbalanced) output amplifier capable of driving a 600Ω (or greater) load to

1:1 Unity

RED

Above Threshold

2:1

4:1

20:1

Rotation Point Threshold

GREEN

Below Threshold

-5

+10

+15 +20

INPUT LEVEL (dB)

-10

-20

BELOW

ABOVE

SLAVE

OVEREASY

-30

+10

-40dBu

+20dBu

THRESHOLD

MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING U.S. PATENTS 4,234,804 4,316,107 4,329,598 4,331,931 4,377,792 4,403,199 4,409,500 4,425,551 4,434,380 4,454,433 4,471,324 4,473,793 OTHER PATENTS PENDING

BAL / UNBAL

+20

+15

+10

− 5

− 10

− 15

Figure 2: OverEasy® Compression Curve

4:1

3:1

6:1

INPUT

10:1

-10

+10

2:1

OUTPUT

-5:1

-2:1

1:1

-1:1

-20dB

+20dB

COMPRESSION

OUTPUT

RATIO

GAIN

DISPLAY

INPUTS

OUTPUTS

UNBALANCED

XLR

GND

LIFT

BALANCED

LIFT

1:1

2:1

4:1

RED

Above Threshold

OverEasy Range

Below Threshold

− 15 − 10 − 5

+10

+15 +20

INPUT LEVEL (dB)

and threshold LEDs

-40

20+

GAIN REDUCTION

C O M P R E S S O R / L I M I T E R

DETECTOR

METER

STEREO

XLR:

INPUT

CALIBRATION

STRAPPING

PIN 1

PIN 2

PHONE:

PIN 3

TIP

PHONE:

SLEEVE

TIP

RING

SLEEVE

TRS 160A ONLY

LEVEL

Rear Panel