Crate Amplifiers Musical Instrument Amplifier GFX 15 User Manual

GFX-15  
GUITAR AMPLIFIER WITH  
DIGITAL SIGNAL PROCESSING  
OWNER’S MANUAL  
Congratulations!  
You are now the proud owner of the Crate GFX-15 guitar amplifier. This small but  
versatile amplifier features two separate channels – one crystal clear and the other  
with our patented “Flex-Wave” distortion – combined with a three-band EQ and an  
easy to operate DSP section which lets you dial in a variety of digital effects such as  
delay, flange, chorus and reverb. A special damping circuit simulates the “current  
source” type output of a tube amp, giving you solid state reliability combined with clas-  
sic tube sounds.  
Like all Crate products, your GFX-15 is designed by musicians and built using  
only the best components. Extensive testing at the hands (and ears) of skilled tech-  
nicians 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  
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GFX-15 Amplifier  
Important Safeguards and Precautions:  
All Crate products are designed for continuous safe operation, as long as common sense is  
used and steps are taken to help avoid certain problems. Abiding by the following rules can  
help prevent damage to your amplifier, yourself and others.  
The amplifier is equipped with a three-pronged AC power cord. To reduce the  
risk of electrical shock, NEVER remove or otherwise attempt to defeat the  
ground pin of the power cord.  
Connect the amplifier ONLY to a properly grounded AC outlet of the proper volt-  
age for your amp.  
Avoid sudden temperature extremes, rain and moisture. Also, avoid sudden and  
intense impact. (If the unit has been subjected to any of the preceding abuses,  
have it looked at by an authorized service center.)  
NEVER set the amplifier on a support that might give out under its weight.  
Always keep the total speaker impedance at or above the rated load.  
Unplug the amplifier before cleaning it. NEVER spray liquid cleaners onto the  
amplifier. Wipe it with a slightly dampened, lint-free cloth to remove dirt and film.  
Do not use the amplifier if it has sustained damage to the chassis, controls, or  
power cord. Refer the unit to an authorized service center for inspection.  
Amplifiers capable of producing high volume levels are also capable of inflicting  
permanent hearing loss or damage, if the exposure to such levels is prolonged.  
Such damage is progressive and irreversible! Consider using quality hearing  
protection devices.  
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 OPERA-  
TION AND TO AVOID INJURY.  
THIS APPARATUS DOES NOT OPERATE NORMALLY AND REQUIRES SERVICE WITH ANY PHYSICAL DAMAGE FROM IMPACT OR  
ANY EXPOSURE TO 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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GFX-15 Amplifier  
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1: INPUT: Connect your guitar here by means of a  
shielded instrument cable.  
8: HIGH: Use this control to adjust the high frequency  
output level. Rotating this control counter clockwise  
reduces the high frequency output, rotating it clockwise  
increases the high frequency output. The High control  
allows a total range of 23dB of boost or cut at 5kHz.  
OVERDRIVE CHANNEL: A high gain channel giving  
you sounds from a slight edge to serious overdrive.  
2: GAIN: Use this control to adjust the amount of com-  
pression and distortion from the amplifier. With the con-  
trol fully counter clockwise, the sound will have a thick  
compressed quality. As you rotate the control clockwise  
the amount of distortion increases. Crate’s exclusive  
“Flex-Wave” circuitry uses sequential cascading gains  
to deliver distortion which is rich in harmonics and  
“touch sensitive.” Use this control along with the Level  
(#3) to create a wide variety of sounds.  
9: DSP MODE: Use this control to select the digital  
effect. Each category and its central location is called  
out (delay, flange, etc.) by the markings around the  
control, with variations, as follows:  
• Bypass (DSP off)  
• Slapback delay  
• Long delay w/regeneration  
• Flange  
• Slow Chorus  
• Fast Chorus  
• Chorus w/small room reverb  
• Small room reverb  
• Large room reverb  
3: LEVEL: Use this control to adjust the output volume  
level from the Overdrive channel: With the control fully  
counter clockwise there will be no output. As you rotate  
the control clockwise the output increases. Use this  
control along with the Gain control (#2) to create a wide  
variety of sounds.  
10: HEADPHONES: For private practice sessions, plug  
a pair of stereo headphones into this jack. The internal  
speaker is disconnected whenever headphones are  
being used.  
4: OVERDRIVE SELECT:  
This  
switch,  
when  
depressed, activates the Overdrive channel. With this  
switch in the out position the Clean channel is activated.  
CLEAN CHANNEL: A normal gain channel designed  
to give you crystal clear sounds to medium distortion.  
11: EXTERNAL SPEAKER: Use this jack to connect  
the GFX-15 to an external speaker with a rated imped-  
ance of at least 4 ohms. The internal speaker is discon-  
nected whenever an external speaker is used.  
5: LEVEL: Use this control to asjust the output volume  
level from the Clean channel: with this control fully  
counter clockwise there will be no output. As you rotate  
this control clockwise the output level increases. For the  
best results, reduce the Low control (#6) when this con-  
trol is near the fully clockwise position.  
WARNING: Do not use headphones in the Speaker  
jack. Serious hearing damage could occur!  
EQUALIZATION  
12: ON LED: The on LED illuminates when the amplifi-  
er is on.  
6: LOW: Use this control to adjust the low frequency  
output level. Rotating this control counter clockwise  
reduces the low frequency output, rotating it clockwise  
increases the low frequency output. The Low control  
allows a total range of 25dB of boost or cut at 80Hz.  
Due to the massive amount of low end available, this  
control should be reduced when playing at high volume  
levels.  
13: POWER: Use this switch to turn the amplifier on  
(top of the switch depressed) and off (bottom of the  
switch depressed).  
14: POWER CORD (rear panel, not shown): This  
grounded power cord is to be plugged into a ground-  
ed power outlet, wired to current electric codes and  
compatible with voltage, power, and frequency  
requirements stated on the rear panel. Do not  
attempt to defeat the safety ground connection.  
7: MID: Use this control to adjust the mid frequency out-  
put level. Rotating this control counter clockwise  
reduces the mid frequency output, rotating it clockwise  
increases the mid frequency output. The Mid control  
allows for 19dB of boost or cut at 900Hz.  
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GFX-15 Amplifier  
GFX-15 TECHNICAL SPECIFICATIONS  
Output Power Rating  
12 watts RMS @ 5% THD 4 ohms, 120VAC  
Gain, Overdrive Channel  
Gain, Clean Channel  
86dB +/-6dB @ 1kHz  
46dB +/-6dB @ 1kHz  
Tone Control Range, Low  
Tone Control Range, Mid  
Tone Control Range, High  
25dB @ 80Hz  
19dB @ 900Hz  
23dB @ 5kHz  
Signal To Noise, Overdrive Channel  
Signal To Noise, Clean Channel  
>50dB  
>65dB  
Maximum Signal Accepted  
Internal Speaker  
2.2 volts RMS min. @ 400Hz  
8” Crate Custom Design 4 ohm  
Input Power Requirements  
120 VAC, 60Hz, 30VA  
100/115VAC, 50/60Hz, 30VA  
230VAC, 50/60Hz, 30VA  
Size and Weight:  
13” H x 13.63” W x 8.25” D, 15 lbs.  
The GFX-15 is covered with a durable black Tolex material: wipe it  
clean with a lint-free cloth. Never spray cleaning agents onto the  
cabinet. Avoid abrasive cleansers which could damage the finish.  
Declaration Of Conformity  
#33, Effective 01-01-2001  
Manufacturer’s Name:  
SLM Electronics  
Production Facility:  
Production Facility:  
Shipping Facility:  
Office Facility:  
11880 Borman Drive, St. Louis, MO 63146, USA  
700 Hwy 202 W, Yellville, AR 72687, USA  
1400 Ferguson Ave., St. Louis, MO 63133, USA  
1400 Ferguson Ave., St. Louis, MO 63133, USA  
Product Type:  
Audio Amplifier  
Complies with Standards:  
LVD:  
Safety:  
EMC:  
92/31/EEC, 93/68/EEC, & 73/23/EWG  
EN60065  
EN55013, EN55020, EN55022, EN61000-3-2,  
& EN61000-3-3  
Supplementary information provided by your local Sales & Services Office or:  
SLM Electronics - R & D Engineering  
1901 Congressional Drive, St Louis, MO 63146, USA  
Tel.: 314-569-0141, Fax: 314-569-0175  
Crate continually develops new products, as well as improves existing ones. For this reason, the  
specifications and information in this Crate manual are subject to change without notice.  
©2001 SLM ELECTRONICS, A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. 63133  
P/N 47-453-01 • 07/01  
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