CRATE CA30D
User Guide

CA30D Acoustic Amplifier
The Front Panel:

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1: Power. 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. 2: Line Out. Use this jack to connect a high impedance, unbalanced line level signal to a house sound board, a recording console or another amplifier. 3: Insert. Use this jack to add external effects to the signal. The ring = send (line out), tip = return (line in), sleeve = ground. This jack can also be used to �chain� multiple amplifiers together, since connecting to this jack does not interrupt the signal going to the amplifier. (See the illustrations on page 5 for more information.) 4: Effects Level. Use this control to adjust the amount of digital signal processing applied to the output signal. 5: Effects Mode. Use this control to select the type of digital signal processing applied to the output signal. (See the section entitled �The DSP Section� on page 6 for more information.) 6: High. This serves as the treble control for both channels. Adjust this control so your high notes and harmonic overtones are lively but not overpowering. 7: Contour. Use this control to set the center point of the mid control. This control should be set at the frequency which gives you the most natural midrange tones.

8: Mid. This serves as the midrange control for both channels. Adjust this control to get the best projection and midrange tones for your instrument. The center point of the mid control is chosen by the setting of the contour control (#7). 9: 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 feedback from your instrument) and should be avoided. 11,13:Input 2, Input 1. The signal output from your acoustic instrument, tape player, rhythm machine, high-Z microphone or other source may be connected 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 (#10 for Input 2, #12 for Input 1). The signals from these two jacks are summed together after their gain stages. 10,12:Gain 2, Gain 1. Use these controls to set the input gain level for the corresponding input jack. These controls set the level of the input signal and serve as the amplifier�s volume controls. 14: AC Line Cord. (Rear panel, not shown) 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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