Crate Amplifiers CA120D manual To Eliminate Instrument Feedback, DSP Section, Milisecond delay

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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 reso- nant feedback at specific frequencies. Instrument tone controls and sound board equalizers are helpful in getting rid of the problem, but they typi- cally 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 CA120D can be eliminated without affecting the overall sound.

If you experience feedback while playing, depress the Feedback Filters On switch. This actives the automatic feedback control circuit. Depress the Feedback Filter 1 switch to isolate and control the offending frequency. If feedback occurs again while the Filter 1 switch is depressed, depress the Filter 2 switch to isolate and control the second offending frequency.

The LEDs above the switches illuminate when the switches are depressed. When a footswitch is used in the Feefback Filters Footswitch jack (#22), the ON LED illuminates when the plug is inserted into the jack and the front panel switches are rendered inoperative.

The DSP Section:

The CA120D features Crate’s On-Board Digital Signal Processing (DSP) technology that was designed specifically for use with acoustic instruments and vocals. This provides a large selection of digital reverbs, effects and delays. Select the type of effect desired by rotating the Mode control (#15). The effects are described below.

When a footswitch is used in the DSP A/B Back Footswitch jack (#23), a separate DSP setting can be stored and recalled for each of the footswitch’s two button positions (LED on, LED off). Refer to the steps on page 5, item #23.

The following chart provides a list of the DSP settings along with a brief description of each effect.

Reverb: R average room reverb

Ssmall dark hall reverb

Mmedium hall reverb

Llarge hall reverb

Delay: S 100 milisecond delay

M200 milisecond delay

L1

335 milisecond delay

L2

500 milisecond delay

Rev/Dly: M

reverb with 250 milisecond delay

L1

reverb with 400 milisecond delay

L2

reverb with 550 milisecond delay

Multi: Ch1

chorus effect

Ch2

chorus, 375 milisecond delay, reverb

Ch3

425 milisecond delay with chorus, reverb

Dblr

adds second signal slightly out of sync with original

Bypass

effects “off”

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Contents CA120D Table of Contents CA120D Acoustic AmplifierAbout the Crate Acoustic CA120D Effects Section Front PanelMaster Section part one Master Section part twoRear Panel CA120D Rear PanelMilisecond delay To Eliminate Instrument FeedbackDSP Section System Block Diagram Channels 1Technical Specifications

CA120D specifications

Crate Amplifiers has carved a niche for itself in the world of guitar amplification, and the CA120D is a testament to the brand's commitment to quality and innovation. Designed with versatility in mind, the CA120D stands out as a powerful combo amplifier, making it an ideal choice for both practice and live performances.

One of the defining features of the CA120D is its robust 120-watt output, allowing it to deliver a rich and full-bodied sound, regardless of the environment. This amplifier is equipped with a pair of 12-inch speakers that provide excellent projection and clarity. The dual speakers contribute to a wide tonal range, proving effective for various music styles, from blues and rock to jazz and country.

The CA120D incorporates a range of advanced technologies that enhance its functionality. One notable feature is the built-in digital chorus and reverb effects, which add depth and dimension to the sound, enriching the listening experience. Musicians can easily adjust these effects via intuitive knobs, ensuring quick modifications during performances or practice sessions.

Additionally, the amp features a three-channel design, consisting of clean, overdrive, and contour channels. Each channel presents its unique tonal characteristics, allowing players to seamlessly transition between clean tones and gritty distortion. The clean channel offers pristine clarity ideal for chord strumming or note articulation, while the overdrive channel delivers that satisfying crunch essential for rock solos.

Another remarkable characteristic of the CA120D is its comprehensive connectivity options. Musicians can plug in various devices through the auxiliary input or utilize the headphone output for silent practice. The amplifier also features an effects loop, making it easy to integrate additional pedals and devices into the signal chain.

Durability is central to the CA120D's design; it's constructed with a rugged cabinet that withstands the rigors of touring and frequent use. The amp’s classic tolex finish not only adds an aesthetic appeal but also provides necessary protection.

Overall, the Crate Amplifiers CA120D is a versatile powerhouse that caters to guitarists seeking a reliable, high-performing combo amplifier. Its unique combination of power, connectivity, and effects make it a valuable addition to any musician's setup, ensuring that it can meet a variety of playing needs with ease. Whether you're in the studio or on stage, the CA120D promises a stunning audio experience and solid performance.
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