User’s Guide

for the

C R AT E

KX-220

Stereo Keyboard Amplifier

Please read this user’s guide before using your new amplifier!

KX-220

Stereo Keyboard Amplifier

Congratulations!

You are now the proud owner of one of the most versatile keyboard amplifiers available, the Crate KX-220

Four Channel Stereo Keyboard Amplifier. This incredible unit features Crate’s legendary performance and high quality construction in a rugged and easy to operate package.

Your KX-220 is proudly made in America, using only the best components. Extensive testing and Crate’s

Five-Year Warranty assure you that your new amplifier is the absolute best it can be. In order to get the most out of it, we strongly urge you to read this manual before using the amplifier.

And thank you for choosing

Table of Contents:

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

The Top Panel . . . . . . . . . . . . . . . . . . . . . . . . .4

The Back Panel . . . . . . . . . . . . . . . . . . . . . . . .5

Sample Hookup Diagram . . . . . . . . . . . . . . . . .6

System Block Diagram . . . . . . . . . . . . . . . . . . .7

Technical Specifications . . . . . . . . . . .back cover

2

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER.

NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

PRECAUCION

RIESGO DE CORRIENTAZO

NO ABRA

PRECAUCION PARA DISMINUOIR EL RIESGO DE CORRIENTAZO

NO ABRA LA CUBIERTA

NO HAY PIEZAS ADENTRO QUE EL USARIO PUEDO REPARAR

DEJE TODO MANTENIMIENTO A LOS TECHNICOS CALIFICADOS

ATTENTION

RISQUE D'ELECTROCUTION

NE PAS OUVRIR

ATTENTION: POUR REDUIRE D'ELECTROCUTION NE PAS

ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE

PAR L'UTILISATEUR. POUR TOUTE REPARATION, S'ADRESSER A UN

TECHNICIEN QUALIFIE.

VORSICHT

ELEKTRISCHE SCHLAGGEFAHR

NICHT OFFENEN

VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT

DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM

BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM

WARTUNGSPERSONAL ZU UBERLASSEN.

THIS EQUIPMENT HAS BEEN DESIGNED AND

ENGINEERED TO PROVIDE SAFE AND RELIABLE

OPERATION. IN ORDER TO PROLONG THE LIFE

OF THE UNIT AND PREVENT ACCIDENTAL DAM-

AGES OR INJURY, PLEASE FOLLOW THESE PRE-

CAUTIONARY GUIDELINES:

ESTE APARATO HA SIDO DISENADO Y CON-

STRUIDO PARA PROVEER ANOS DE OPERACION

SEGURA Y CONFIABLE. PARA PROLONGAR LA

VIDA DE ESTA UNIDAD E IMPEDIR DANOS ACCI-

DENTALES POR FAVOR SIGA ESTAS INSTRUC-

CIONES PREVENTIVAS:

CAUTION: TO REDUCE THE RISK OF ELECTRIC

SHOCK, DO NOT OPEN CHASSIS; DO NOT

DEFEAT OR REMOVE THE GROUND PIN OF THE

POWER CORD; CONNECT ONLY TO A PROPERLY

GROUNDED AC POWER OUTLET.

PRECAUCION: PARA DISMINUIR EL RIESGO DE

DESCARGAS ELÉLECTRICAS: (1) NO ABRA LA

CUBIERTA, (2) NO ES RECOMENDABLE

REMOVER O DESACTIVAR LA PATA DEL POLO A

TIERRA DEL CABLE DE CORRIENTE, CONECTE

CORRECTAMENTE A UNA TOMA DE CORRIENTE

A TIERRA.

WARNING: TO REDUCE THE RISK OF FIRE OR

ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIP-

MENT TO RAIN OR MOISTURE.

CAUTION: NO USER-SERVICEABLE PARTS

INSIDE. REFER SERVICING TO QUALIFIED SER-

VICE PERSONNEL.

ADVERTENCIA: PARA EVITAR DESCARGAS

ELECTRICAS O PELIGRO DE INCENDIO, NO DEJE

ESTE APARATO EXPUESTO A LA LLUVIA O

HUMEDAD.

PRECAUCION: NO HAY PIEZAS ADENTRO QUE

EL USUARIO PUEDE REPARAR. DEJE TODO MAN-

TENIMIENTO A LOS TÉCNICOS CALIFICADOS.

CAUTION: OUR AMPLIFIERS ARE CAPABLE OF

PRODUCING HIGH SOUND PRESSURE LEVELS.

CONTINUED EXPOSURE TO HIGH SOUND PRES-

SURE LEVELS CAN CAUSE PERMANENT HEAR-

ING IMPAIRMENT OR LOSS. USER CAUTION IS

ADVISED AND EAR PROTECTION IS RECOM-

MENDED IF UNIT IS OPERATED AT HIGH VOLUME.

PRECAUCION: NUESTROS AMPLIFICADORES

PUEDEN PRODUCIR NIVELES DE PRESION DE

SONIDO ALTO. EXPOSICION CONTINUADA A LOS

NIVELES DE PRESION DE SONIDO ALTO PUEDE

CAUSA DANO PERMANENTE A SU OIDO. ES

ACONSEJADO QUE USE PRECAUCION AL

USUARIO Y ES RECOMENDADO PROTECCION

PARA LOS OIDOS SI LA UNIDAD ES OPERADA A

VOLUMEN ALTO.

THE CHART BELOW SHOWS THE U.S. GOVERNMENT’S OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA) REGULATIONS WHICH WERE IN EFFECT AT THE TIME OF THIS PUB-

LICATION FOR PERMISSIBLE NOISE EXPOSURE, PER 29CFR1910.95, TABLE G-16:

SOUND LEVEL DBA,

SLOW RESPONSE

90

92

95

DURATION PER DAY

IN HOURS

8

6

4

SOUND LEVEL DBA,

SLOW RESPONSE

97

100

102

DURATION PER DAY

IN HOURS

3

2

1 - 1 1/2

SOUND LEVEL DBA,

SLOW RESPONSE

105

110

115

DURATION PER DAY

IN HOURS

1

1/2

1/4 or less

ACCORDING TO OSHA, ANY EXPOSURE IN EXCESS TO THESE AMOUNTS LISTED ABOVE COULD RESULT IN SOME HEARING LOSS.

EXPLANATION OF GRAPHICAL SYMBOLS:

EXPLICACION DE SIMBOLOS GRAFICOS:

=

"DANGEROUS VOLTAGE"

“VOLTAJE PELIGROSO”

"DANGER HAUTE TENSION"

"GEFAHLICHE SPANNUNG"

=

"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"

“ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.”

"REFERREZ-VOUS AU MANUAL D'UTILISATION"

"UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"

KX-220

Stereo Keyboard Amplifier

Features:

Below are some of the outstanding features which set the KX-220 in a class by itself. Additional information on these features can be found throughout the remainder of this manual.

•Complete stereo circuitry all the way to the internal power amplifier

•Four separate input channels, each with its own level, pan and reverb/effect send controls

•Three stereo line level channels, each with 1/4” left and right/mono input jacks

•One “dual mono” channel, with a 1/4” instrument and an XLR microphone input jack, plus a two band EQ

•Line out select switches (channels 3 and 4) – keeps those channels out of the external mix if desired

•Eight band stereo graphic EQ for total tone control

•Master level, effects return, reverb return, and line out level controls

•Internal spring reverb

•Stereo effects loop for external effects

•Stereo line out jacks for connecting to a mixing board, recording unit, or PA system

•Stereo preamp out jacks for connecting to additional amplifiers

•Power amp in jack (use two KX-220’s for total stereo performance)

• Built in power amp limiter for clean sound at full output

• Rugged construction and easily accessed controls

• Removable casters for greater mobility

• Crate’s exclusive Five Year Warranty (where applicable)

3

4

KX-220

Stereo Keyboard Amplifier

1: Level Control (channel 1–3): Adjust the input level of the signal(s) with this control. Each channel’s level control governs the right/mono and left input jacks simultaneously.

2: Pan Control, (channel 1–3): This control proportions the signal between the left and right outputs. In stereo applications it acts as a left/right balance control.

3: Rev/Eff Send Control (all channels): Adjust the amount of signal sent to the internal reverb and external effect (if used) with this control.

4: Line Out Select Switch (channels 3 and 4): When this switch is pressed in, the signal is removed from the line out buss. (For example, if you want a click track or other signal in your amp but not in the house mix, press in the switch for that signal’s channel. The signal will still be in your amp, but not in the mix at the line out jack. You hear it, the house doesn’t!)

5: Instrument Level Control (channel 4): An instrument level signal can be plugged directly into channel 4’s instrument jack (#16).

Adjust the level of the instrument with this control.

6: Mic Level (channel 4): A low impedance microphone signal can be plugged into channel 4’s microphone input jack (#17). Adjust the input level of the microphone signal with this control. The adjacent peak LED (#7) will light when the signal is too hot.

7: Mic Level Peak LED (channel 4): This LED will light when the microphone input signal is near clipping. Under normal use, this

LED might flash on peak signals. If the LED stays on, reduce the mic level control (#6).

8: Low and High EQ: Adjust the low and high frequency levels for channel 4 with these controls.

9: Pan Control (channel 4): This control proportions the signal between the left and right outputs.

10: Graphic EQ: Use this eight band stereo graphic equalizer to tailor the output of your amp to best suit your taste and room acoustics.

11: Effects Return: Adjust the overall amount of external effect (if used) with this control.

12: Reverb Return: Adjust the overall amount of internal reverb with this control.

13: Master Level: Adjust the overall output level of the amplifier with this control.

14: Line Out Level: Adjust the output level of the signal at the line out jacks (#19) with this control.

The Top Panel:

4

4

3

3

3

9

3

13

14

2

2

2

8

8

11

12

7

10

1

1

1

5

6

The Rear Panel:

15

15

15

16

17

KX-220

Stereo Keyboard Amplifier

21

18

19

20

23

24

22

15: Input Jacks (channel 1–3): Connection of an instrument, drum machine, tape deck channel, microphone or other high impedance (balanced or unbalanced) line level signal with 1/4” plug can be made here. For stereo inputs use the right/mono jack for the right channel input and the left jack for the left channel input. For two mono inputs into one channel, use the right/mono jack for one and the left jack for the other. For a single mono input into one channel, use the right/mono jack only.

16: Instrument Input Jack (channel 4): Connection of an instrument (such as a bass guitar) can be made here.

17: Microphone Input Jack (channel 4): Connection of a low impedance microphone can be made here. This XLR jack carries +16 volts phantom power on pins 2 and 3.

18: Effects Loop: Connection of an external effects unit can be made here. Plug a signal cable from the amplifier’s send jack to the unit’s input jack. Plug another cable (or, for stereo effects, a pair of cables) from the effect unit’s output jack(s) to the amplifier’s return jack(s). (Mono effects connect into the jack labeled right/mono.) The level of the effects can be controlled by the channel rev/eff send controls (#3) and the effects return control (#11).

19: Line Out Jacks: These pre-eq jacks allow connection to a mixing board, recording unit, or house PA system. (These are non-balanced output jacks.)

20: Preamp Out Jacks: These post-eq jacks allow connection to an external power amp. When a plug is inserted into the left preamp out jack, the amplifier’s left channel signal is interrupted from its internal power amp and is routed only through the jack. This allows you to achieve a true stereo output if you connect your main KX-220’s left preamp out jack to a second KX-220’s power amp input jack (see #21).

21: Power Amp Input Jack: Connection directly into the KX-

220’s internal power amplifier is possible through this jack.

The amp will ignore any other input signals, all control settings and any external effects, and will only amplify the signal sent into the power amp input jack.

22: External Speaker Jack: Connection to an extension speaker cabinet can be made here. The extension cabinet must have a minimum impedance of 4 ohms. This jack is in parallel with the internal speakers and using this jack does not disconnect them.

23: Power Switch: Turns the amplifier on (I) and off.

24: AC Line In: Connect the AC power cord here. Be sure the cord is properly plugged into a safely wired, grounded 120 volt, 60Hz AC power outlet before use. (If your amplifier was purchased outside the United States, refer to the rear panel for power ratings.) For your safety, never attempt to defeat the ground connection on this cord.

5

KX-220

Stereo Keyboard Amplifier

Sample Hookup Diagram:

In the diagram below, the two mono keyboards are both connected into channel 1. The channel 1 pan control lets you adjust the relative level between the two signals. The metronome plugged into channel 3 may be heard through the amplifier but not the house sound system if the line out select switch is pressed in. A stereo effects device has been connected to the effects loop, although a mono device can also be used. An additional KX-220 has been connected to the left channel preamp out jack, to achieve a true stereo output.

SELF-POWERED

SPEAKERS

STEREO POWER AMP

AND PA SPEAKERS

MAIN KX-220 AMPLIFIER

RECORDING UNIT

MIXING BOARD

EFFECTS UNIT

LEFT

OUT

RIGHT

OUT

IN

LOW–Z

MIC

BASS

METRONOME

STEREO KEYBOARD/SYNTHESIZER

RIGHT OUT

LEFT OUT

MONO OUT

MONO KEYBOARD/SYNTHESIZER

MONO OUT

MONO KEYBOARD/SYNTHESIZER

6

OPTIONAL ADDITIONAL KX-220 AMPLIFIER

FOR LEFT CHANNEL – "TRUE STEREO"

POWER AMP INPUT

KX-220

Stereo Keyboard Amplifier

System Block Diagram:

RIGHT/MONO

INPUT

LEFT

INPUT

LEVEL

PAN

REV/EFF

SEND

RIGHT/MONO

INPUT

LEFT

INPUT

LEVEL

PAN

REV/EFF

SEND

RIGHT/MONO

INPUT

LEFT

INPUT

LEVEL

PAN

REV/EFF

SEND

LINEOUT

SELECT

LOW-Z

MIC

INPUT

HIGH-Z

INPUT

+16V PHANTOM POWER

GAIN

PEAK LED

EQ

GAIN

LOW HIGH

PAN

REV/EFF

SEND

LINE OUT

SELECT

MAIN

BUS

R L

REV/

EFF

SEND

BUS

LINE

OUT

BUS

R L

LINE OUT

LEVEL

LINE OUT

RIGHT/MONO

LINE OUT

LEFT

RIGHT CHANNEL EQUALIZER

MASTER

LEFT CHANNEL EQUALIZER

EFF

SEND

REVERB

EFF RET

RIGHT/MONO

EFF RET

LEFT

REVERB

RETURN LEVEL

EFF RETURN

LEVEL

PREAMP OUT

RIGHT/MONO

POWER

AMP IN

POWER

AMP

LIMITER

EXTERNAL

SPEAKER

CROSSOVER

PREAMP OUT

LEFT

R L

MAIN

BUS

REV/

EFF

SEND

BUS

R L

LINE

OUT

BUS

7

KX-220

Stereo Keyboard Amplifier

Technical Specifications

Output Power Rating

Maximum Signal Accepted

Nominal Input Impedance

Gain

Channels 1,2,&3

Channel 4

Effects Return

Channels 1,2,&3

Channel 4

Channels 1,2,&3

Channel 4

Power Amp

Channel 4 EQ

Master EQ

Line Out/Line In Levels

Input Power Requirements

Limiter Range

Speaker Specifications

Size and Weight

Low Frequency

High Frequency

160 watts RMS minimum @5% THD @ 4 ohm internal speaker

220 watts RMS with 4 ohm extension speaker

Right/mono / Left: 6 volts peak to peak

Instrument: 28 volts peak to peak; Microphone: 4 volts peak to peak

Right/mono: 27 volts peak to peak; Left: 27 volts peak to peak

Right/mono / Left: 22k ohm

Instrument: 220k ohm; Microphone: 600 ohm

Right/mono / Left: 30dB

Instrument: 37dB; Microphone: 64dB

36dB

Low: ±10dB @ 50Hz; High: ±10dB @ 10kHz

±12dB @ 40Hz, 100Hz, 225Hz, 625Hz, 1.6kHz, 4kHz, 8kHz, 16kHz

1 volt RMS typical

120 VAC, 60Hz, 205VA

100/110 VAC, 50/60Hz, 205VA

230 VAC, 50/60Hz, 205VA

20dB, maximum distortion 1%

15” Crate Custom Design, 2.5” voice coil, 56 oz. magnet

4”x4” Bullet Horn, 1” voice coil, replaceable phenolic diaphragm,

8 oz. magnet

20.5” H* x 20.5” W x 17.5” D; 73 lbs (*add 1.5” for casters)

Due to ongoing product development and improvement, the specifications contained herein are subject to change without notice.

www.crateamps.com

©1999 SLM Electronics, Inc. • A Division of St. Louis Music, Inc.

1400 Ferguson Avenue • St. Louis, MO 63133

47-046-01 • 02/99