CA15
Acoustic Amplifier
User's Guide
CA15 Acoustic Amplifier
Table of Contents:
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.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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.
"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"
EXPLANATION OF GRAPHICAL SYMBOLS:
EXPLICACION DE SIMBOLOS GRAFICOS:
EXPLICATION DES SYMBÔLES GRAPHIQUES:
"DANGEROUS VOLTAGE"
"VOLTAJE PELIGROSO"
"DANGER HAUTE TENSION"
=
=
PRECAUCION
RIESGO DE CORRIENTAZO
NO ABRA
PRECAUCION: PARA REDUCIR EL RIESGO DE INCENDIOS O DESCARGAS
ELECTRICAS, NO PERMITA QUE ESTE APARATO QUEDE EXPUESTO A LA
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.
ATTENTION
RISQUE D'ELECTROCUTION
NE PAS OUVRIR
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.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . .4, 5
The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .5
The Tilt Back Feature . . . . . . . . . . . . . . . . . . . . . .6
System Block Diagram . . . . . . . . . . . . . . . . . . . .7
Technical Specifications . . . . . . . . . . .back cover
CA15 Acoustic Amplifier
Introduction:
Congratulations!
You are now the proud owner of one of Crate's latest contributions to the
world of acoustic amplification, the CA15. This compact amplifier delivers
over 12 watts of musical power and incorporates two inputs (each with its
own gain control), three bands of equalization, and reverb. A pair of RCA-
type CD Input jacks allows you to practice with your favorite music. A jack for
headphones is provided, along with a jack for connecting the CA15 to an
external speaker cabinet. A Crate Custom Design 8"woofer delivers smooth
clear sound with excellent projection and fidelity.
The CA15 features a flip-out locking bar underneath the cabinet which
allows you to tilt the amplifier back for increased coverage and projection.
Your CA15 was designed by musicians and built using only the best com-
ponents. 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 CRATE.
3
CA15 Acoustic Amplifier
The Front Panel:
1,3: Input 1, Input 2.
The signal output from your acoustic instrument, tape
player, rhythm machine, high-Z microphone or other source may be con-
nected to either or both of these jacks by means of a shielded signal cable.
Each of the input jacks is governed by its corresponding gain control (#2
for Input 1, #4 for Input 2). The signals from these two jacks are summed
together after their input gain stages.
2,4: Gain 1, Gain 2.
Use these controls to set the input gain level for the cor-
responding input jack. These controls set the level of the input signal and
serve as the amplifier's volume controls.
5: Low.
This serves as the bass control for both channels. Adjust this control
to get the best sounding bass response for your instrument. Excessive
boost of the low control can cause an unnatural howling (acoustic feed-
back from your instrument) and should be avoided.
6: Mid.
This serves as the midrange control for both channels. Adjust this
control to get the best projection and midrange tones for your instru-
ment.
7: High.
This serves as the treble control for both channels. Adjust this con-
trol so your high notes and harmonic overtones are lively but not over-
powering.
8: Reverb Level:
Use this control to adjust the amount of reverberation
added to the signal. In the fully counter clockwise position, the signal is
dry (no reverb added). As you rotate the control clockwise the amount of
reverb increases.
1
2
3
6
4
5
4
CA15 Acoustic Amplifier
The Front Panel (con't):
The Rear Panel (not shown):
9: CD Input.
Use these jacks to connect the output from a CD player, tape
deck, or rhythm machine to the amplifier. The CD Input jacks are post EQ
and Gain, so use the level control on the CD player (etc.) to adjust the
level of the signal at these jacks.
10: Headphones.
Use this jack to connect headphones to the amplifier. The
internal speaker is disconnected when this jack is used.
11: External Speaker.
Use this jack to connect the amplifier to an external
speaker. The internal speaker is disconnected when this jack is used. The
impedance of the external speaker must be 4 ohms or greater. Do not
attempt to use headphones in the External Speaker jack! Permanent
hearing damage could result.
12: Power Switch.
Use this switch to apply power to the amplifier. The amp
is on when the top of the switch is depressed, off when the bottom of the
switch is depressed. The switch illuminates when the amp is on.
13: AC Line Cord.
The grounded power cord should only be plugged into a
grounded power outlet that meets all applicable electrical codes and is
compatible with the voltage, power, and frequency requirements stated
on the rear panel. Do not attempt to defeat the safety ground connection.
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8
9
10
11
5