CA120D Acoustic Amplifier User’s Guide
CA120D Acoustic Amplifier Table of Contents: About the Crate Acoustic CA120D . . . . . . . . . . . . . . . . . 3 The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 The Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 To Eliminate Instrument Feedback . . . . . . . . . . . . . . . . . 6 The DSP Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .
CA120D Acoustic Amplifier About the Crate Acoustic CA120D: D esigned for the performing artist, Crate’s CA120D Acoustic Amplifier gives you more of what you want. More power. More clarity. More control. And, more freedom. Imagine: microphone quality sound, without feedback. And without being “chained” to a mic stand! More power: a 120 watt RMS power amplifier drives a Studio Monitor-style 12” subwoofer for plenty of volume and low end punch.
CA120D Acoustic Amplifier The Front Panel: 1 2 3 4 5 6 7 NOTE: Channel 1 and Channel 2 are independent of each other up to the Effects and Master sections. The text below (#1–10) applies to both channels. 1: Low-Z. The signal from a low impedance microphone may be connected here by means of a shielded, balanced microphone cable terminated with an XLR connector. This jack has 15 volts phantom power applied to pins 2 and 3. (Mics not requiring phantom power will not be affected.) 2: Gain 1.
CA120D Acoustic Amplifier The Rear Panel: 19 20 21 19: Power. Use this switch to turn the amplifier on (top of the switch depressed) and off (bottom of the switch depressed.) The power switch illuminates when the amplifier is on. 20: 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.
CA120D Acoustic Amplifier 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.
CA120D Acoustic Amplifier phantom power line out Channels 1 and 2: master effects System Block Diagram: peak low-z tones gain DSP/eff send high-z low mid cntr high gain effects send mode high-z bal DSP line out level foot switch aux in/ eff ret aux in/ eff ret low-z bal cd input gnd lift gain high pass level hi-freq driver feedback filters on/off* limiter low pass feedback circuit foot switch* filter 1 tweeter cut power amp filter 2 low-freq driver external speaker *NOTE: Fe
CA120D Acoustic Amplifier Technical Specifications: Output Power Rating: 120 watts @ <1% THD Channels 1 & 2: Low: +/-15dB @ 80Hz Mid: High: +15, -30dBdB from 450Hz – 1.2kHz (Contour) +/-15dB @ 10kHz Input Impedance: 3.3M ohm High-Z, 3k ohm Low-Z Input Sensitivity: 5mV High-Z, 2mV Low-Z Sens. to Eff Send/Line out: 6mV High-Z, 3mV Low-Z Max Input Signal: CD Input: Input Impedance: 6V RMS (17V peak to peak) 22k ohm Input Sensitivity: 150mV Max Input Signal: 6V RMS (17V peak to peak) AuxEff.
