Dbx 363X Manuel utilisateur

MODEL 363X

aINoise Gate

Service Manual

(Preliminary)

CAUTION |AVIS |

RISK OF ELECTRIC SHOCK

DO NOT OPEN

RISQUE OE CHOC

ELECTRIQUE

NE PAS OUVRIR

DO NOT EXPOSE TO RAIN OR MOISTURE

CAUTION: TO REDUCE THE risk of electrical shock, do NOT REMOVE COVER (OR BACK).

NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS APPLIANCE TO

RAIN OR MOISTURE.

This symbol, wherever it appears,

alerts you to the presence of uninsulated

dangerous voltage inside the enclosure —voltage

that may be sufficient to constitute arisk of shock.

This symbol, wherever it appears,

alerts you to important operating

and maintenance instructions in

the accompanying literature.

Read the manual.

Manufactured under one or more of the following U.S. patents: 3,377,792; 3,681,618; 3,714,462; 3,789,143;

4,097,767; 4,329,598; 4,403,199; 4,409,500; 4,425,551; 4,473,795. Other patents pending.

This dbx-branded product has been manufactured by AKG Acoustics, Inc.

AKG is aregistered trademark of Akustiche u. Kino-Gerate Ges m.b.H., Austria.

All trademarks are property of their respective companies.

This manual is part number 96015-000-02

Jbx

dbx Professional Products

adivision of AKG Acoustics, Inc.

1525 Alvarado Street, San Leandro, CA 94577 USA

Telephone (1) 510/351-3500 Fax: (1) 510/351-0500

Introduction

The half rack design of the 363X can accommo-

date up to four channels of gating in one rack

space, or 16 channels of gating in four rack spaces.

The 363X can be auseful tool in any musical

situation.

In the studio, the 363X can be used to:

•Eliminate headphone leakage into the mi-

crophones

•Gating drum mics to eliminate rattling

snares or to tighten the sound of akick

drum

•Gating instrument mics to eliminate amp

noise

•Muting the mixdown inputs to the two-

track as an economical solution to automat-

ion

In live sound applications, the 363X can be used

to gate:

•signal processing gear that produce hum

such as synthesizers, samplers and elec-

tronic drums

•Microphones for lead vocals, background

vocals, drums and other musical instru-

ments

•Microphones that are intermittently used

•Noisy digital and analog reverb and delay

devices

Special Applications

The 363X gating action can be controlled by an

external signal at the Key Input on the rear panel.

This is useful for applications such as frequency

weighted gating or anticipatory gating for zero at-

tack times.

Front Pandl dbx 363X

Figure 1: Front Panel

A. STEREO COUPLE switch and LED.

Depress this switch to activate Stereo-coupling

(CH 1MASTER, CH 2SLAVE). The LED next

to the STEREO COUPLE button turns on when

the 363X is actively stereo coupled. In Stereo

Couple mode, the THRESHOLD, HOLD and

RELEASE controls on Channel 2have no effect

on the gating action. The Channel 2OPEN,

HOLD and RELEASE LEDs track with Channel

1meters.

B. THRESHOLD control and OPEN LED

(CH 1and CH 2)

Adjusting this control sets the level at which

the gate will open with regard to the Input

level. The THRESHOLD control is calibrated in

dB from -60 to +20dB, to provide an 80dB oper-

ating range.

The green OPEN LED located above the

THRESHOLD control turns on whenever the in-

put signal (or Key Input signal) rises above the

set THRESHOLD level.

Front Panel

Figure 2: Front Panel

CHOLD control Lnd HOLD LED

(CH 1and CH 2)

The Hold function determines the amount of

time the gate remains open after the input sig-

nal falls below the threshold. The HOLD con-

trol is calibrated in seconds, with arange of 0

(OFF) to 3seconds.

When the HOLD function is used, the yellow

HOLD LED turns on as soon as the input level

falls below the threshold. The HOLD LED will

remain illuminated until the HOLD function

has completely timed out.

Front Panel dbx 363X

D. RELEASE control and RELEASE LED

(CH 1and CH 2)

The RELEASE control determines the rate at

which the gate closes once the signal at [the in-

put falls below the threshold and the HOLD

function is timed out.

The RELEASE control is calibrated from 3000 1

dB/second to 10 dB/second. :

The intensity of the red RELEASE LED will in-

crease as the attenuation increases. If the Re-

lease rate is set for afast release, the LED

illuminates quickly.

E. KEY MONITOR switch (CH 1and CH 2)

Depressing this switch allows the signal at the

KEY input to be routed directly to the audio

output. When KEY MONITOR is selected, all of

the front panel functions are inactive except BY-

PASS. i

F. KEY ENGAGE switch (CH 1and CH 2)

Depressing this switch causes the channel to re-

spond to the signal at the KEY input. When the

Key Engage switch is depressed and no signal

is present, the 363X does not pass ajny signal.

G. BYPASS switch (CHI and CH 2)

Depressing the BYPASS button creates a"hard-

wire bypass" of the 363X circuitry Ipy connect-

ing the input directly to the output!1

BYPASS overrides all controls, even if power is

removed from the 363X.

Rear Panel

Figure 3: Rear Panel

A. INPUT Connector (CHI and CH 2)

The signal input of the 363X is unbalanced and

can accept amaximum input level of +18dBu.

It requires aWHp/Sleeve phone plug.

B. OUTPUT Connector (CH 1and CH 2)

The signal output of the 363X is unbalanced

and is capable of driving +18dBu into a6000

load. It requires aWTip/Sleeve phone plug.

C. KEY Input (CHI and CH 2)

The KEY input is unbalanced and can accept a

maximum input level of +20dBu. It requires a

WTip/Sleeve phone plug.

D. AC Voltage Select Switch

Selects for use between 120VAC or 240VAC op-

eration. Be sure to determine the line voltage

before applying power to the 363X.

Rear Panel

E. AC power cable

Connect this cable to any 50Hz or 60Hz AC

power source of the correct line voltage, as

shown by the AC LINE VOLTAGE requirement

indicator above. Note that the 363X does not

have apower switch. It is recommended that

the363X be "ON" at all times. The Model 363X

consumes amaximum of 12 watts AC power.

WARNING: Be sure to verify both your actual

line voltage and the voltage for which your

Model 363X was wired, as indicated on the rear

panel of your unit. Connection to an inappro-

priate power source may result in extensive

damage which is not covered by the warranty.

dbx 363X

Connecting The 363X To Your System

The 363X can be used with any line-level device.

Some common examples include: mixing consoles,

musical instruments, patch bays, and signal proces-

sors.

A. Mixing Board:

If you wish to gate aparticular track of amulti-

track recording or one channel of alive per-

formance mix, the 363X output can be directly

connected to aline input jack, or wired to an In-

sert point.

Connecting The 363X To Your System dbx 363X

Figure 5: Connecting a363X to aGuitar

B. Musical Instruments (i.e., Electric Guitar,

Bass, Keyboards):

Because the 363X has an 80dB input range, the

output of an electric guitar can drive the 363X's

input. For greater sensitivity and improved sig-

nal to noise, it is recommended that the 363X be

connected to the "PREAMP OUT" of your gui-

tar amp (if so equipped), or the output of some

other device that is designed to accept low-

level instrument inputs (including various

stomp boxes, rack mount audio products, and

the dbx Performer Series processing units). Fig-

ure 5A shows the 363X connected between the

output of apre-amp and the input of apower

amp.

Microphones, like guitars, also typically have

low-level outputs. Therefore, it is recom-

mended that the 363X be connected after the

mic pre-amp.

In Figure 5B, the 363X is connected to the out-

puts of asynthesizer to gate out the constant

noise inherent in most keyboards. 9

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