Crate Amplifiers Musical Instrument Amplifier CA60 User Manual

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Crate Acoustic amplifiers are  
Made With Pride in the U.S.A.  
Technical  
Specifications:  
To get this amplifier to sound its best,  
read this owner’s guide prior to its use.  
Output Power Rating: 60 watts RMS total system power  
Internal Amp: 2 x 30 watts RMS @1% THD  
Inst. Channel: Low: +/-15dB @ 80Hz  
Mid: +/-15dB @ 650Hz  
To keep this amplifier looking its best,  
avoid abrasive cleansers. Wipe the cab-  
inet clean using a slightly dampened  
cloth. Never use brass cleaners on the  
hardware since they could damage  
their protective coatings.  
High: +/-15dB @ 10kHz  
Shape: -25dB @ 600Hz  
Input Impedance: 25k ohm (Active), 2.2M ohm (Piezo)  
Input Sensitivity: 22mV RMS (Active), 9mV RMS (Piezo)  
Sens. to Eff Send/Line out: 70mV  
Max Input Signal: 6v RMS (17v peak to peak)  
Feedback Elimination: Freq: variable from 80Hz to 4kHz  
Cut: variable from -0 to -30dB  
Voc./Aux Channel: Low: +/-15dB @ 80Hz  
High: +/-15dB @ 10kHz  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
Input Impedance: 3k ohm (Lo-Z), 20k ohm (Hi-Z)  
Input Sensitivity: 3mV RMS (Lo-Z), 15mV RMS (Hi-Z)  
Sens. to Eff Send/Line out: 9mV (Lo-Z), 50mV (Hi-Z)  
Max Input Signal: 10v RMS (28v peak to peak)  
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,  
DO NOT REMOVE COVER.  
NO USER-SERVICEABLE PARTS INSIDE.  
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
ATTENTION  
VORSICHT  
RISQUE D'ELECTROCUTION  
NE PAS OUVRIR  
ELEKTRISCHE SCHLAGGEFAHR  
NICHT OFFENEN  
Effects Loop: Line Out 1v RMS,  
Line In 1v RMS  
ATTENTION: POUR REDUIRE D'ELECTROCUTION NE PAS  
ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE  
Eff Return to Line Out Sens: 50mV  
PAR L'UTILISATEUR. POUR TOUTE REPARATION, S'ADRESSER  
TECHNICIEN QUALIFIE.  
A
UN  
Eff Return In. Impedance: 11k ohm  
VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT  
DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM  
BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM  
WARTUNGSPERSONAL ZU UBERLASSEN.  
Eff Send Out. Impedance: 2.2k ohm  
Line Out Out. Impedance: 220 ohm (Lo-Z), 2.2k ohm (Hi-Z)  
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND  
RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE UNITAND PREVENT  
ACCIDENTAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY  
GUIDELINES:  
Internal Woofers: 2 x 6-1/4” w/polypropylene cones,  
rubber surrounds, 17.7oz magnet,  
1” voice coil, 4 ohms, 50w RMS,  
95dB 1w 1m  
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.  
Internal Tweeter: High efficiency Piezo,  
110dB 1w 1m  
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE  
THIS EQUIPMENT TO RAIN OR MOISTURE.  
Internal Crossover: Passive type  
Power Requirements: 120VAC, 60Hz, 60VA;  
100/115VAC, 50/60Hz, 60VA;  
CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED  
SERVICE PERSONNEL.  
230VAC, 50/60Hz, 60VA  
CAUTION: 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  
PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.  
Size and Weight: 13-1/2”H x 21-3/16”W x 10-1/4”D,  
42 lbs.  
"DANGEROUS VOLTAGE"  
“VOLTAJE PELIGROSO”  
"DANGER HAUTE TENSION"  
"GEFAHLICHE SPANNUNG"  
EXPLANATION OF  
GRAPHICAL SYMBOLS:  
=
"
NES.”  
"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"  
Crate continually develops new products, as well as improves  
existing ones. For this reason, the specifications and information  
in this manual are subject to change without notice.  
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On the  
Front Panel:  
Instrument  
Vocal / Aux  
Gain  
Phantom  
Chorus  
Depth  
Master  
Level  
Active  
Rev/Eff  
Send  
Rev/Eff  
Send  
Rev  
Power  
Low-Z  
Hi-Z  
Input  
Gain  
Low  
0
Mid  
High  
Freq  
500Hz  
Cut  
-15dB  
Rate  
Low  
0
High  
0
Return  
Piezo  
0
0
Shape  
Chorus  
0
10  
–15  
+15  
–15  
+15  
–15  
+15  
80Hz  
4kHz  
0
–30dB  
0
10  
0
10  
0
10  
0
10  
–15  
+15  
–15  
+15  
0
10  
0
10  
0
10  
Peak  
Chorus  
Crate Acoustic CA60  
16 17 18 19  
20  
21  
22  
23  
24  
25  
1
2 3  
4
5
6
7
8
9
10  
11 12 13  
14  
15  
The Instrument channel:  
14: Chorus Rate. Use this control to adjust the rate of the chorus effect.  
Rotating this control clockwise increases the rate at which the effect  
occurs.  
1: Input. The signal output from your acoustic instrument may be con-  
nected here by means of a shielded instrument cable.  
2: Active/Piezo switch. Use this switch to select the type of pickup on  
your instrument. For active electronic pickups, set the switch to  
“active” (switch out). For passive/magnetic pickups, set it to “piezo”  
(switch depressed).  
The Vocal/Aux channel:  
15: Low-Z input. The signal output from a low impedance microphone  
may be connected here by means of a shielded, balanced microphone  
cable terminated with an XLR connector.  
16: Hi-Z input. The signal output from a high impedance microphone or  
a line level signal may be connected here by means of a shielded sig-  
nal cable terminated with a 1/4” tip/sleeve connector.  
17: Phantom Power switch. This switch, when depressed, applies 15  
volts phantom power to pins 2 and 3 of the Low-Z input jack (#15), for  
proper operation of microphones requiring phantom power. (Mics not  
needing phantom power will not be affected by this switch.)  
18: Chorus On/Off switch. This switch, when depressed, applies the  
internal chorus effect to the vocal/aux channel. (Chorus is only avail-  
able for this channel when the instrument channel’s chorus switch,  
#12, is depressed.)  
19: Gain. This serves as the input level control for the vocal/aux channel  
of the amplifier. Adjust this control for the best mix with the signals  
from the instrument channel.  
20: Low. This serves as the vocal/aux channel’s primary bass control.  
Adjust this control to get the best sounding bass response for this  
channel. Excessive boost of the low control can cause an unnatural  
howling and should be avoided.  
21: High. This serves as the vocal/aux channel’s primary treble control.  
Adjust this control so the high notes and harmonic overtones are live-  
ly but not overpowering.  
22: Rev/eff send. Use this control to adjust the amount of internal reverb  
and/or external effect (if used) for the vocal/aux channel.  
3: Shape. This switch, when depressed, serves as a mid-cut control,  
adding fullness to the sound of your instrument.  
4: Gain. This serves as the input level control for the instrument channel  
of the amplifier. For the best signal to noise ratio set this control so the  
Peak LED (#5) flashes when playing your instrument fairly hard.  
5: Peak LED. This LED flashes when the signal level into the preamp  
approaches clipping. Adjust the Gain control (#4) until a strong signal  
from your instrument causes this LED to flash.  
6: Low. This serves as the instrument channel’s primary bass control.  
Adjust this control to get the best sounding bass response for your  
instrument. Excessive boost of the low control can cause an unnatural  
howling and should be avoided.  
7: Mid. This serves as the instrument channel’s primary midrange con-  
trol. Adjust this control to get the best projection and midrange tones  
for your instrument.  
8: High. This serves as the instrument channel’s primary treble control.  
Adjust this control so your high notes and harmonic overtones are  
lively but not overpowering.  
9: Freq. Use this control along with the Cut control (#10) to eliminate  
instrument feedback. For information on the proper use of this con-  
trol, please read the section entitled To Eliminate Instrument  
Feedback.”  
10: Cut. Use this control along with the Freq control (#9) to eliminate  
instrument feedback. For information on the proper use of this con-  
trol, please read the section entitled To Eliminate Instrument  
Feedback.”  
11: Rev/Eff send. Use this control to adjust the amount of internal reverb  
and/or external effect (if used) for the instrument channel.  
12: Chorus On/Off switch. This switch, when depressed, applies the  
internal chorus effect to the instrument channel.  
13: Chorus Depth. Use this control to adjust the magnitude of the chorus  
effect. Rotating this control clockwise increases the intensity of the  
effect.  
The Master Section:  
23: Rev Return. Use this control to adjust the amount of internal reverb –  
rotate the control clockwise to increase the effect, counter-clockwise to  
decrease it.  
24: Level. Use this control to set the overall output level of the amplifier.  
25: 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 bot-  
tom of the switch is depressed. This switch will illuminate when the  
amplifier is on.  
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On the  
Rear Panel:  
33: Line Out Level. Use this control to adjust the output level of the line out  
signal. (This control works independently from the amplifier’s master  
level control.)  
Effects  
Loop  
Foot  
Line Outputs  
Switch  
Not Shown:  
Off  
On  
0
10  
Gnd  
Lift  
Power cord. Connect the end of this cord to a suitable source of line volt-  
age. Refer to the voltage information on the back of the amplifier for its  
voltage and current requirements.  
Note: This is a grounded plug. To avoid the possibility of electric shock,  
DO NOT defeat the ground connection in any way!  
Level  
Low Z  
Bal.  
High Z  
Bal.  
Return  
Send  
Reverb/  
Chorus Tweeter  
33  
32  
31 30 29  
28  
27 26  
26: Tweeter On/Off swtich. This switch, when depressed, deactivates the  
CA60’s internal tweeter.  
27: Footswitch. Connect the supplied two-button footswitch here for  
remote on/off control of the internal reverb and chorus. (When connect-  
ed, the footswitch overrides the front panel chorus on/off switch.)  
Note: This is a STEREO jack: tip controls the chorus, ring controls the  
reverb, sleeve is ground. Use only a footswitch equipped with a stereo  
1/4” plug.  
28: Effects Loop Send. When using an external signal processor, connect  
this jack to the input of the effect by means of a shielded signal cable.  
29: Effects Loop Return. When using an external signal processor, connect  
this jack to the output of the effect by means of a shielded signal cable.  
30: Ground Lift. This switch, when depressed, electronically disconnects  
the low Z balanced output jack’s chassis ground connection. If you expe-  
rience excessive noise when using the low Z balanced output jack,  
depress this switch.  
31: High Z Bal. Use this jack to connect a high impedance, line level signal  
to a house sound board, a recording console or an external power ampli-  
fier by means of an 1/4” stereo plug-terminated cable. (Ring is signal +,  
tip is signal -, and sleeve is ground.)  
32: Low Z Bal. Use this jack to connect a low impedance, line level signal to  
a house sound board, a recording console or an external power amplifi-  
er by means of an XLR-terminated cable. (Pin 1 is ground, pin 2 is signal  
+, and pin 3 is signal -.)  
To Eliminate Instrument Feedback:  
One of the most common problems encountered when amplifying  
acoustic instruments, especially in small environments, is feedback.  
Acoustic instruments typically have inherent qualities which cause res-  
onant feedback at specific frequencies. Instrument tone controls and  
sound board equalizers are helpful in getting rid of the problem, but  
they typically operate around relatively wide frequency bands. This  
almost always means the musician must sacrifice sound quality in his  
quest to do away with feedback. But since Crate’s feedback elimination  
circuit isolates only the offending frequency, instrument feedback from  
the CA60 can be eliminated without affecting the overall sound.  
Chances are, you may not have a problem with feedback at all. In  
that case, set the CA60’s Freq and Cut controls fully counter-clockwise.  
However, if you do encounter feedback while playing, set the Cut control  
to -30dB (fully clockwise) and adjust the Freq control until the feedback  
is gone. Reduce the Cut to the 12 o’clock position and readjust the Freq  
control as needed. Continue reducing the Cut control and readjusting the  
Freq control until there is no more feedback with the Cut control as far  
counter-clockwise as possible. This approach effectively eliminates  
instrument feedback without sacrificing the quality of your sound.  
CA60 Block Diagram:  
left right  
line out  
effects  
instrument  
effects  
send  
channel  
chorus  
input  
filter  
tones  
chorus  
on  
on  
rev/  
effect  
send  
active piezo  
reverb  
return  
freq cut  
gain  
low mid high shape  
depth rate  
spring reverb  
peak  
phantom  
power  
high pass  
filter  
line out  
high  
low  
tweeter  
on/off  
rev/  
effect  
send  
vocal/aux  
channel  
low-z  
input  
hi-z  
bal.  
on  
chorus  
right  
left  
tones  
low-z  
bal.  
level  
30w  
master  
level  
effects  
return  
gain  
low high  
hi-z  
input  
low  
30w  
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©1999 SLM Electronics  
A Division of St. Louis Music Co.  
1400 Ferguson Avenue  
P/N 47-941-01  
09/99  
St. Louis, MO 63133  
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