CRATE CA60
Owner's Manual

On the Rear Panel:

33: Line Out Level. Use this control to adjust the output level of the line out
Line Outputs
Effects Loop Foot Switch

signal. (This control works independently from the amplifier�s master level control.) Not Shown: Power cord. Connect the end of this cord to a suitable source of line voltage. 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!

0

10

Off

Level

Low Z Bal.

High Z Bal.

Gnd Lift

Return

Send

Reverb/ On 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 connected, 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 experience 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 amplifier 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 amplifier 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 resonant 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 effects line out instrument channel input filter tones chorus rev/ effect send on chorus effects send on

active piezo

freq

cut

gain

low mid high shape peak

depth rate

spring reverb

reverb return

phantom power low-z input vocal/aux channel tones level hi-z input gain low high effects return low-z bal. master level left rev/ effect send line out chorus on hi-z bal. right 30w tweeter on/off

high pass filter high

low

low 30w