Crest Audio X-RACK XRM Bedienungsanleitung

owner’s manual

X-Rack rack mount mixers

XRM - 12 Output Monitor Mixer

1Save the carton and packing materials!

Should you ever need to ship the unit,

use only the original factory packing.

For replacement packaging, call Crest Audio’s

Customer Service Department directly.

2Read all documentation before

operating your equipment. Retain all

documentation for future reference.

3Follow all instructions printed on

unit chassis for proper operation.

4Do not use the unit if the electrical

power cord is frayed or broken.

The power supply cord should be rout-

ed so that it is not likely to be walked on

or pinched by items placed upon or

against it.

5Always operate the unit with the

AC ground wire connected to the

electrical system ground. Precautions

should be taken so that the means of

grounding of a piece of equipment is not

defeated.

6Damage caused by connection to

improperAC voltage is not covered

by any warranty.

7Do not spill water or other liquids

into or on the unit, or operate the

unit while standing in liquid.

8The power cord of equipment

should be unplugged from the out-

let when left unused for a long peri-

od of time.

Service Information

Do not open unit!

Opening the unit will expose you to

potentially dangerous voltages.There are

no user serviceable parts inside.

Equipment should be serviced by

qualified service personnel when:

A. The equipment has been exposed to rain.

B. The equipment does not appear to oper-

ate normally, or exhibits a marked change in

performance.

C. The equipment has been dropped, or the

enclosure damaged.

To obtain service:

contact your nearest Crest Audio

Service Center, Distributor, Dealer,

or Crest Audio at 201.475.4600 USA

or visit www.crestaudio.com for addi-

tional information.

email techserve@crestaudio.com

This symbol is used to alert

the operator to follow important

procedures and precautions

detailed in documentation.

This symbol is used to warn opera-

tors that uninsulated “dangerous

voltages” are present within the

equipment enclosure that may

pose a risk of electrical shock.

XRM owner’s manual

Important precautions

Master section P .29

Solo and Monitoring System, Output Masters.

Front panel controls and rear panel connectors.

Stereo Input channels p.19

Front panel controls and rear panel connections

Mono Input channels p. 7

Front panel controls and rear panel connections

table of contents

Introduction

Thank you and congratulations on your purchase of your new

Crest Audio X-Rack mixer.We’re confident that you will enjoy

many years of trouble-free service from it.You will quickly find

that it fits into a wide variety of mixing applications with ease.

Due to well thought out sets of features, coupled with intelli-

gent circuit design and the highest standards in construction &

workmanship, all Crest Audio console products excel above and

beyond the competitor’s products, in every area.

This owner’s manual covers the XRM X-Rack mixer.The XRM

has 12 Mono inputs and 4 Stereo inputs, adding up to a total of

20 microphone inputs. Each input can feed any of 12 outputs.

Please read this manual thoroughly and keep it handy for future

reference. If you have any operating concerns that are not cov-

ered in this manual, or have application questions of any type,

don’t hesitate to contact Crest Audio directly either by phone,

fax, or email. Here is our technical support contact information:

Phone: (201) 475-4600

Fax: (201) 475-4677

Email: techserve@crestaudio.com

Specifications P. 4 1

XRM owner’s manual

p.4

XRM block diagram

BAL XLR

BAL LINE IN

INPUT

PREAMP

GAIN

10 - 70 dB

FOUR BAND EQ

LEVEL

LF LOW MID HI MID HF

HPF

LINE

(MIC PAD)

26dB

PA D

PRE-SOURCE

SELECT

PRE

SOURCE

MUTE ?

SOLO DC

+10

MUTE

INSERT

SEND / RTN

+48V ON

EQ ON

FADER AMP

PRE-SOURCE

BUFFER

YES

SOLO LEFT MAIN

RIBBON

CABLE

40 WAY

XRM MONO INPUT MODULE

12 MONO INPUTS AVAILABLE

HPF

70Hz

-18dB/Oct

FREQ

INPUT

SIGNAL

LED

PRE

FADER

POST

FADER

LEVEL LEVELFREQ LEVEL

SOLO RIGHT

12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ

XRM BLK DIA-REV1.0 - 5/20/02

PFL

SOLO

TRIGGER

CHAN

FADER

MIX 1-4

PRE

FADER

PRE

INSERT

REAR PANEL

GAIN

15 - 60 dB

FOUR BAND EQ - LEFT

LEVEL

LF LOW MID HI MID HF

LINE

(MIC PAD)

PRE

SOURCE

MUTE ?

+10

MUTE

+48V ON

EQ ON FADER

AMPS

PRE-SOURCE

BUFFERS

YES

SOLO LEFT

XRM STEREO INPUT MODULE

4 STEREO INPUTS AVAILABLE

SUM

MONO FREQ

POST

FADER

L & R

LEVEL LEVELFREQ LEVEL

SOLO RIGHT

12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ

PFL

SOLO

TRIGGER

CHAN

LEVEL

PRE

FADER

PRE

REAR PANEL

BAL LINE IN

INPUT

PREAMP

26dB

PA D

LF LOW MID HI MID HF

12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ

FOUR BAND EQ - RIGHT

+10

PRE-SOURCE

SELECT

PRE

FADER

PRE

LEFT

RIGHT

LEFT

RIGHT

LEFT

RIGHT

LEFT

RIGHT

PRE

FADER

L & R

PRE-AMP

OUT

L & R

PRE

FADER

POST

FADER

PRE

ODD MIX

BAL OUT

MIX INSERT

SEND / RTN

XRM MIX PAIR

1 OF 6 PAIRS SHOWN

ODD

MIX AMP

+10

PEAK

(AFL)

SIG

SIG/PK

LED

POST

FADER

ODD

FADER

60MM

PRE

FADER

ODD MIX

BUS IN

SOLO DC

SOLO LEFT

SOLO RIGHT

AFL-ODD

PEAK

(PFL)

SIG

PEAK

CIRCUIT

INPUT

SIGNAL

LED

PEAK

(PFL)

SIG

SOLO DC

PEAK CIRCUIT

MONITOR

OUT - L

MONITOR / HP

LEVEL

HEADPHONE

AMP

SOLO LEFT

SOLO

MIX AMPS

SOLO DC

SOLO

FEED

L - R

SOLO

CONTROL

LOGIC

-3

SOLO

PWR

LED

METERS

FOLLOW SOLO

POWER

AC IN

100-240V

50 / 60 Hz

80W

X-RACK REAR PANEL:

AC INLET & SWITCH

UNIVERSAL INPUT-VOLTAGE

SWITCHING POWER SUPPLY

+17V

-17V

+12V

+48V

INTERNALLY FUSED AND

SHORT-CIRCUIT PROTECTED

TO POWER

DISTRIBUTION

RIBBONS

ANALOG

GROUND

AUX DC

GROUND

SAFETY

GROUND

TO CHASSIS CHASSIS

GROUND

BNC CONNECTOR

FOR 12VOLT LAMP

( ON FRONT PANEL )

SHORT-CIRCUIT

PROTECTION

POLY

FUSES

XRM BLOCK DIAGRAM

PGAIN

ROTARY

POT PAD LED

AMP PANEL

SWITCH

FADER

FET

SWITCH

BALANCED

DRIVER

ALL SWITCHES SHOWN IN THE UP (DESELECTED) POSITION

AMP(LIFIER) GAIN SHOWN IN DB WHEN NEEDED

WHEN SHOWN: 1/4” TRS SWITCHING JACKS HAVE NORMALLY CLOSED CONTACTS

USER OPTIONS IMPLEMENTED WITH REMOVABLE LINKS AND SOLDER BLOBS

DEFAULT OPTION POSITION SHOWN UNDERLINED

GROUND COMP

DRIVER

BICOLOR

LED

1/4” TRS

JACK

XLR

JACK

OBE

FRANK

ELECT

SWITCH

STANDARD OUTPUT LEVEL IS +4 dBu AT 0 VU

PIN 2 HOT ON ALL BALANCED INPUTS AND OUTPUTS (XLR JACKS)

FOR UNBALANCED OPERATION:

TIE PIN 3 TO PIN 1, USE PIN 2 FOR OUTPUT, PIN 1 FOR GND

“Ø” SYMBOL INDICATES POLARITY REVERSE LEGENDS

USER OPTIONS

SOLDER

BLOB

FITTED

LINK RCA

JACK

SOLO

LINK

IN OUT

Use 5-Pin DIN cable to

interconnect two Consoles

SOLO-LINK CONNECTORS.

USE 5-PIN DIN CABLE FROM

SLAVE CONSOLE OUT

TO MASTER CONSOLE IN

SOLO-LINK:

TIES SOLO AUDIO AND

CONTROL BETWEEN

CONSOLES. SLAVE SOLOS

SHOW UP ON MASTER

CONSOLE.

DC OUTPUT

PIN 1 LIFT

MIX SENDS 1 & 2

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 3 & 4

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 5 & 6

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 7 & 8

LEV / LEV

LEV / PAN

SWITCHING

M10

MIX SENDS 9 & 10

LEV / LEV

LEV / PAN

SWITCHING

M11

M12

MIX SENDS 11 & 12

LEV / LEV

LEV / PAN

SWITCHING

26dB

PA D

PIN 1 LIFT

SPLIT

OUT

BAL XLR

SPLIT

OUT

BAL XLR

SPLIT

OUT

MIX 1-4

PRE

MIX SENDS 1 & 2

LEV / LEV

LEV / PAN

SWITCHING

PRE

FADER

MIX SENDS 3 & 4

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 5 & 6

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 7 & 8

LEV / LEV

LEV / PAN

SWITCHING

M10

MIX SENDS 9 & 10

LEV / LEV

LEV / PAN

SWITCHING

M11

M12

MIX SENDS 11 & 12

LEV / LEV

LEV / PAN

SWITCHING

SUM

HPF

40Hz

-18dB/Oct

EVEN MIX

BAL OUT

MIX INSERT

SEND / RTN

EVEN

MIX AMP

+10

PEAK

(AFL)

SIG

SIG/PK

LED

POST

FADER

EVEN

FADER

60MM

PRE

FADER

EVEN MIX

BUS IN

HPF

40Hz

-18dB/Oct

STEREO PAIR

STEREO

PA I R

LO-CUT

AFL-EVEN

CTRL TO

INPUT SENDS

SOLO

LOGIC

SWITCH

AFFECTS BOTH

ODD & EVEN

SOLO RIGHT

SPEAKER

MONITOR

OUT - R

COMMON

INPUT - L

COMMON

INPUT

LEVEL

ODD

MIX BUSES

EVEN

MIX BUSES

SOLO AND MONITOR CIRCUITS

HEADPHONE

JACK

COMMON

INPUT - R

COMMON INPUT CIRCUITRY

how to use this manual

format

This manual uses a format that is intended to be easy to read, yet technical for those

who need to know all the details. For feature descriptions, this is done by devoting the

left side of each page to 1) an overall module picture, 2) a block diagram, and 3) a con-

trol closeup.These images all pertain to the features and control descriptions on the

right side of the page.The intention is to make the manual easy to read while including

all the technical details needed for getting the most out of the X-Rack - a compact, flexi-

ble, feature-rich addition to Crest Audio's growing line of audio mixing console products.

conventions

Control Icons

This manual uses symbols to illustrate what the control descriptions are referring to.This

makes it possible to avoid redundant wording and makes the control descriptions clear.

Switch in the UP, non-activated position

Switch in DOWN, activated position

Switch that illuminates when in the DOWN position

Momentary switch that illuminates when activated

LED that is on, indicating that it's associated feature is activated

Potentiometer

Standard 1/4" TRS jack (used for line level inputs)

1/4" TRS jack with normal switching (used on inserts)

Female XLR input jack

Male XLR output jack

T= Send

R= Return

S= GND

T= IN +

R= IN –

S= GND

LED

p.5

Mono input channel

p.6

XRM owner’s manual

500500500500500500500500500500500

500

PFL

10 0

•

–

10 0

•

–

CHAN

LE VEL

1515

+–

1515

+–

1515

+–

1515

+–

ON 1

600

2K 3K

400

300

500

100

MIX SENDS

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

SIG

MUTE

GAIN

LO CUT

500500500

PRE

500500500500500500500500500500500

500

LINE INPUT

(MIC PAD )

LO CUT

500500500

GAIN

BAL XLR

BAL LINE IN

INPUT

PREAMP

GAIN

10 - 70 dB

HPF

LINE

(MIC PAD)

26dB

PA D

INSERT

SEND / RTN

+48V ON

HPF

70Hz

-18dB/Oct

REAR PANEL

PEAK

(PFL)

SIG

PIN 1 LIFT

SPLIT

OUT

Module

Block diagram

Controls

Front panel features

Line Input (Mic Pad)

With this switch in the UP position, the input preamp circuit is set up to accept a mic-level

signal. This signal is brought in via the XLR mic-input connector located on the rear panel.The

1/4" TRS input jack is ignored.

When the switch is depressed, a Pad is inserted into the signal path and the input preamp

circuit is set up to accept a line-level signal from either the XLR mic-input connector or the 1/4"

TRS input jack, both located on the rear panel.The XLR signal is normal'd to the 1/4” TRS jack. If

nothing is plugged into the TRS jack, the XLR signal is fed to the preamp when the LINE switch is

pressed. Since the TRS signal is always padded down by 26dB, this feature allows the LINE switch

to act as a PAD switch for bringing a very hot microphone signals down to a controllable level,

avoiding overload.When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input signal is

disconnected and the signal present on the 1/4” plug is fed to the preamp. If plugs are inserted

into both the XLR and TRS jacks, this switch acts as an input selector switch between the two

jacks.

Gain

The Input gain control is used to establish proper gain structure in the channel. For best

results, use the Solo system to monitor the channel while you set the gain.The goal is maximum

gain without distortion. Both the main LED meters (during Solo) and the channel’s Level/Peak

indicator can be used for adjusting gain.

70 Hz Lo-Cut filter

This filter reduces or eliminates unwanted low frequencies without substantially affecting the pro-

gram material. Quite often, such unwanted low frequencies are included with mic- or line-input

signals. For example, stage rumble or wind can be picked up through vocal mics.The cut-off fre-

quency of the filter is 70 Hz and the slope is -18dB per octave.This type of filter is also referred

to as a Hi-pass filter (HPF). It allows the hi-frequencies to pass, but stops the lo-frequencies.

Lo Cut Switch

Lo-Cut filter is bypassed.

Lo-Cut filter is on.

Mono Input channel 1

p.7

Mono input channel

p.8

XRM owner’s manual

500500500500500500500500500500500

500

PFL

10 0

•

–

10 0

•

–

CHAN

LE VEL

1515

+–

1515

+–

1515

+–

1515

+–

ON 1

600

2K 3K

400

300

500

100

MIX SENDS

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

SIG

MUTE

GAIN

LO CUT

500500500

PRE

500500500500500500500500500500500

500

1515

+–

1515

+–

1515

+–

1515

+–

ON 1

600

2K 3K

400

300

500

100

MIX SENDS

LO CUT

10 70

500500500

PRE

FOUR BAND EQ

LEVEL

LF LOW MID HI MID HF

EQ ON

XRM MONO INPUT MODULE

12 MONO INPUTS AVAILABLE

FREQ LEVEL LEVELFREQ LEVEL

12 KHZ400 - 8 KHZ80 - 2 KHZ80 HZ

CHAN

FADER

Module

Block diagram

Controls

Front panel features

Equalizer (EQ)

Many audio signals coming into the console require some degree of corrective eq in order to be

part of a good sounding mix. XRM offers a 4-Band EQ on each channel.The input EQ consists of

the bands: High, High-Mid, Low-Mid and Low.The High and Low frequency bands are shelving

equalizers, each have a boost/cut control and their frequencies are fixed.The High-Mid and Low-

Mid bands have a bell-shaped response, each band features variable boost/cut and adjustable fre-

quency.

high frequency—HF

Boost / Cut 15dB boost and cut. Shelving @ 12 kHz

high mid—HM

Frequency Continuously variable between 400 Hz and 8 kHz.

Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves

Low mid—LM

Frequency Continuously variable between 100 Hz and 2 kHz.

Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves

Low frequency—LF

Boost / Cut 15dB boost and cut. Shelving @ 80 Hz.

EQ on

Equalizer is OFF. The equalizer circuitry is bypassed.

Equalizer is ON. This switch is used to activate the EQ section and can be used to make

A/B comparisons between "flat" and eq'd signals.

p.9

Mono Input channel 1

p.10

Mono input channel

1XRM owner’s manual

500500500500500500500500500500500

500

PFL

10 0

•

–

10 0

•

–

CHAN

LE VEL

1515

+–

1515

+–

1515

+–

1515

+–

ON 1

600

2K 3K

400

300

500

100

MIX SENDS

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

SIG

MUTE

GAIN

LO CUT

500500500

PRE

500500500500500500500500500500500

500

10 0

•

–

500

MIX SENDS

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

10 0

•

–

MUTE

500500500

PRE

PRE-SOURCE

SELECT

PRE

SOURCE

MUTE ?

SOLO DC

+10

MUTE

EQ ON

FADER AMP

PRE-SOURCE

BUFFER

YES

SOLO LEFT

EVEL

SOLO RIGHT

12 KHZ

PFL

CHAN

FADER

MIX 1-4

PRE

FADER

PRE

INSERT

PEAK

CIRCUIT

MIX SENDS 1 & 2

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 3 & 4

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 5 & 6

LEV / LEV

LEV / PAN

SWITCHING

MIX SENDS 7 & 8

LEV / LEV

LEV / PAN

SWITCHING

M10

MIX SENDS 9 & 10

LEV / LEV

LEV / PAN

SWITCHING

M11

M12

MIX SENDS 11 & 12

LEV / LEV

LEV / PAN

SWITCHING

Module

Block diagram

Chan SendsChan Fader

500500500500500500500500500500500500

PFL

10 0

•

–

CHAN

LEVEL

500

•

10 0

•

–

SIG

MUTE

500500500

SOLO PWR

COMMON

NPUT

500500

SIG

AFL

234

OUTPUT MASTERS

STR PAIR LO CUT STR PAIR LO CUT

1–23

–4

STR PA R O CUT STR PA R O CUT

500500500500500500500500500500500 500500500

Master Faders

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