Crate Amplifiers Musical Instrument Amplifier XK50 User Manual

XK50 Keyboard Amplifier  
User’s Guide  
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XK50 Keyboard Amplifier  
Congratulations!  
You are now the proud owner of the Crate XK50 keyboard amplifier. This compact powerhouse fea-  
tures a 12” Crate Custom woofer and a Piezo tweeter housed in a ported tuned enclosure. Each of its two  
input jacks has its own level control so you can mix your keyboard with another instrument or a high-Z  
mic. The CD input jacks allow you to play along with your favorite music. The Insert jack allows you to  
connect external effects to the to the amp and doubles as a line out jack to send a signal to a recorder,  
mixing board or house PA. The headphones jack allows for private practice sessions.  
The XK50’s angled cabinet allows you to use it as an upward projecting floor monitor or stand it  
upright like a conventional amplifier.  
Like all Crate products, your XK50 is designed by musicians, and built using only the best compo-  
nents. Extensive testing at the hands (and ears) of skilled technicians and musicians insures you that this  
amplifier is the absolute best it can be.  
In order to get the most out of your new amplifier, we strongly urge you to go over the information  
contained in this manual before you begin playing.  
And thank you for choosing  
System Block Diagram:  
PEAK  
LIMIT  
INSERT  
REVERB  
INPUTS  
EQ  
LIMITER  
EXT.  
INST.  
SPEAKER  
1
POWER  
AMP  
LEVEL 1  
LEVEL 2  
REVERB  
LEVEL  
MASTER  
VOLUME  
LO LO HI HI  
MID MID  
ATTENUATOR  
INST.  
2
CD INPUT  
HEAD  
PHONES  
CAUTION  
PRECAUCION  
ATTENTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
RIESGO DE CORRIENTAZO  
NO ABRA  
RISQUE D'ELECTROCUTION  
NE PAS OUVRIR  
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC  
SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOIS-  
TURE. TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT  
REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE.  
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
PRECAUCION: PARA REDUCIR EL RIESGO DE INCENDIOS  
O
DESCARGAS  
LA  
ATTENTION: PROTÉGEZ CET APPAREIL DE LA PLUIE ET DE L'HUMIDITÉ  
AFIN D'ÉVITER TOUT RISQUE D'INCENDIE OU D'ÉLECTROCUTION. 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.  
ELECTRICAS, NO PERMITA QUE ESTE APARATO QUEDE EXPUESTO  
A
LLUVIA  
O
LA HUMEDAD. 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.  
IMPORTANT SAFETY INSTRUCTIONS  
READ, FOLLOW, HEED, AND KEEP ALL INSTRUCTIONS AND WARNINGS.  
DO NOT OPERATE NEAR ANY HEAT SOURCE AND DO NOT BLOCK ANY VENTILATION OPENINGS ON THIS APPARATUS. FOR  
PROPER OPERATION, THIS UNIT REQUIRES 3” (75mm) OF WELL VENTILATED SPACE AROUND HEATSINKS AND OTHER AIR  
FLOW PROVISIONS IN THE CABINET.  
DO NOT USE THIS APPARATUS NEAR SPLASHING, FALLING, SPRAYING, OR STANDING LIQUIDS.  
CLEAN ONLY WITH LINT-FREE DAMP CLOTH AND DO NOT USE CLEANING AGENTS.  
ONLY CONNECT POWER CORD TO A POLARIZED, SAFETY GROUNDED OUTLET WIRED TO CURRENT ELECTRICAL CODES AND  
COMPATIBLE WITH VOLTAGE, POWER, AND FREQUENCY REQUIREMENTS STATED ON THE REAR PANEL OF THE APPARATUS.  
PROTECT THE POWER CORD FROM DAMAGE DUE TO BEING WALKED ON, PINCHED, OR STRAINED.  
UNPLUG THE APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERIODS OF TIME.  
ONLY USE ATTACHMENTS, ACCESSORIES, STANDS, OR BRACKETS SPECIFIED BY THE MANUFACTURER FOR  
SAFE OPERATION AND TO AVOID INJURY.  
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.  
SERVICE MUST BE PERFORMED BY QUALIFIED PERSONNEL.  
OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND  
PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PRO-  
TECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.  
EXPLANATION OF GRAPHICAL SYMBOLS:  
EXPLICACION DE SIMBOLOS GRAFICOS:  
EXPLICATION DES SYMBÔLES GRAPHIQUES:  
"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"  
"DANGEROUS VOLTAGE"  
“VOLTAJE PELIGROSO”  
"DANGER HAUTE TENSION"  
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XK50 Keyboard Amplifier  
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10  
11 12 13  
14  
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16  
17  
1. INPUT 1: Use this 1/4” jack to connect your key-  
board or other line level signal to the amplifier by  
means of a shielded instrument cable. The signal  
level at this jack is controlled by the Level 1 knob (#3).  
11. LEVEL: Use this control to adjust the overall out-  
put signal of the amplifier.  
12. LIMIT: The XK50 employs an internal limiter cir-  
cuit to help prevent overdriving the output signal. This  
LED illuminates when the limiter circuit is activated.  
During normal playing conditions, this LED will flash  
occasionally. If this LED remains illuminated, reduce  
the level controls.  
2. INPUT 2: Use this 1/4” jack to connect your key-  
board or other line level signal to the amplifier by  
means of a shielded instrument cable. The signal  
level at this jack is controlled by the Level 2 knob (#4).  
3. LEVEL 1: Use this control to adjust the level of the  
13. CD INPUT: Use these RCA jacks to connect the  
output from a CD player or tape deck to the amplifier.  
The signal at these jacks is combined into a mono sig-  
nal which is sent to the internal power amp circuit.  
Use the CD or tape player’s output level control to  
adjust the signal for the proper mix with your instru-  
ment.  
signal connected to the Input 1 jack (#1).  
4. LEVEL 2: Use this control to adjust the level of the  
signal connected to the Input 2 jack (#2).  
5. PEAK: This LED illuminates when the input signal  
level nears clipping. For the best signal to noise ratio,  
adjust the Level controls until this LED flashes on  
strong signal peaks.  
14. INSERT: Use this jack to connect external effects  
to the amplifier. This is a stereo R/T/S 1/4” jack: ring =  
line out, tip = line in, sleeve = ground. This jack can  
also provide a line out signal - insert a mono T/S 1/4”  
plug half way into the jack to obtain the signal. (This  
will not interrupt the signal going into the internal  
power amp.)  
6. LOW: Use this control to adjust the bass response  
of the amplifier. Rotating the control counterclockwise  
reduces the low frequency output. Rotating the con-  
trol clockwise increases the low frequency output.  
7. LO MID: Use this control to adjust the “thickness”  
or “fatness” of the amplifier. Rotating the control coun-  
terclockwise reduces the lower midrange frequency  
output. Rotating the control clockwise increases the  
lower midrange frequency output.  
15.  
(HEADPHONES): Use this jack to connect  
headphones to the amplifier. The internal speakers  
are disconnected when this jack is used.  
CAUTION: To avoid possible damage to your  
hearing, do not use headphones for extended  
periods of time at extremely loud levels.  
8. HI MID: Use this control to adjust the clarity and  
definition of the amplifier. Rotating the control coun-  
terclockwise reduces the upper midrange frequency  
output. Rotating the control clockwise increases the  
upper midrange frequency output.  
16. ON: This LED illuminates when the amplifier is  
turned on.  
17. POWER: Use this switch to turn the amplifier on  
(top of the switch depressed) and off (bottom of the  
switch depressed).  
9. HIGH: Use this control to adjust the high frequency  
response of the amplifier. Rotating the control coun-  
terclockwise reduces the high frequency output.  
Rotating the control clockwise increases the high fre-  
quency output.  
18. POWER CORD (rear panel, not shown): The  
grounded power cord should only be plugged into a  
grounded power outlet that meets all applicable elec-  
trical codes and is compatible with the voltage, power,  
and frequency requirements stated on the rear panel.  
Do not attempt to defeat the safety ground con-  
nection.  
10. REVERB: Use this control to adjust the amount of  
reverberation added to the signal. With the control  
fully counter clockwise, the signal is dry - no reverb  
added. As you rotate the control clockwise the  
amount of reverb added increases.  
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XK50 Keyboard Amplifier  
XK50 TECHNICAL SPECIFICATIONS:  
Output Power Rating  
Gain  
50 watts RMS @ 2% THD, 8 ohm load – 120 VAC line  
50dB, tones at 12:00 @ 1kHz  
Tone Control Range  
Low: 18dB @ 50Hz  
Lo Mid: 21dB @ 150Hz  
Hi Mid: 16dB @ 1kHz  
High: 29dB @ 10kHz  
Input Impedance  
Maximum Signal Accepted  
Insert Jack  
10k ohms  
10 volts peak to peak  
Line Output (Max): 2.5 volts peak to peak  
Line Input (Max): 2.5 volts peak to peak  
Speaker Size and Rating  
Crate Custom Design 12” w/ 1.5” voice coil,  
30 oz. magnet; power handling 100 watts  
Piezo Tweeter; power handling 150 watts  
Cabinet Type  
Port Tuned enclosure  
Input Power Requirements  
120 VAC, 60Hz, 85VA  
100/110 VAC, 50/60Hz, 85VA  
230 VAC, 50/60Hz, 85VA  
Cabinet Size and Weight  
21.5” H x 17.5” W x 15” D, 39.5 lbs.  
Declaration of Conformity  
Manufacturer’s Name: SLM Electronics  
Corporate Headquarters: 1901 Congressional Drive, St. Louis, Missouri 63146  
Primary Production Facility: 700 Hwy 202 W, Yellville, Arkansas, 72687  
Product Type: Audio Amplifier  
Products meet the regulations for compliance marking under:  
ETL standards UL6500, UL60065, or UL813  
CSA standards E60065 or C22.2 No.1-M90  
CE safety standard EN60065  
CE EMC standards EN55103 or EN55013 and EN61000  
C-tick designation Level 2, ABN #56748810738, ARBN# N222  
KETI standard K60065 (limited model approval)  
Compliance Support Contact: SLM Electronics, Attn: R&D Compliance Engineer  
1901 Congressional Drive, St Louis, Missouri, 63146 • Tel.: 314-569-0141, Fax: 314-569-0175  
©2004 SLM ELECTRONICS, A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. U.S.A. 63133  
P/N 47-385-02 • 102504  
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