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Acoustic Image Corus Series III Combo Amp - Used w/ Case  From Acoustic Image

Huge and clear tone from a very portable package!


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Acoustic Image Amps

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Condition: Used, Very Good-Excellent

Manufacturer's Description from Acoustic Image

Welcome to Acoustic Image!

Our combo amps all use the same superb class-D 400-watt (4 ohms) power amplifier, the same compact three-way speaker system (also used in the Contra EX, but the speaker configuration of the Corus is slightly different) and the same sophisticated, sensitive preamplifier. The features of the preamp and the speaker configuration define the specific combo model. The power amp is a high-efficiency design that requires no external heat sinks or cooling fans and is capable of driving loads as low as 2 ohms. AC power and output speaker jacks are located on the rear of the enclosure. A standard, three-prong detachable AC power cord is used to provide power to the unit, while AC voltage selection switch allows the unit to operate at 115V/60 Hz or 230V/50 Hz. Japan models operate at 100V, 50/60 Hz only. See the rear panel of your amp to verify theAC voltage capability. The Contra combo is equipped with a one-channel preamp, the Coda R adds a second, identical channel and a six-program effects unit. The Corus combo has the same preamp as the Coda R but uses a different speaker system that gives it a somewhat different sound from the other combos. The input channels of both preamp types incorporate combo jack interfaces that allow either a high impedance instrument input (to optimize the sound of piezo-type pickups) or a mic input, an effects loop with return level control, a selectable notch/low cut filter for feedback control and reduction of low frequency boominess, a direct out capability with ground lift and pre/post EQ switch, a master level control and a mute switch. The two-channel preamp of the Coda R and Corus has a switch that allows the second channel to be disconnected from the main amp and connected to a satellite power amp to create a stereo system. All of our speaker enclosures incorporate a 10-inch downfiring woofer, a 5-inch frontfiring midrange, and a 1-inch defeatable tweeter. The Corus uses a different woofer that gives it a sound that is better for instruments like guitar. A built-in, spring-loaded tilt mechanism allows the cabinet to be tilted back to better direct sound to your listening position. The cabinet is made of an acoustically inert, high durability, injection molded polymer material which dramatically reduces the weight of the cabinet. Each unit comes with a fitted slip cover and shoulder strap. Both padded and hard shell cases are available as accessories. While our combos and speakers are designed to play loudly--and clearly--enough so that you can be heard in most gigging situations, they are not suited to playing at extreme volumes. Generating high SPLs may require an extension cabinet like the Contra EX or augmentation by a larger house system.

Acoustic Image Amps

About Manufacturer

Although Acoustic Image is a relatively young company, it is owned and operated by people with decades of experience in the professional music and sound industry. They're engineers (and, like their customers they're also musicians) who insist upon superior sound quality and reliable performance from our audio equipment. Acoustic Image was founded because they were never satisfied with the products available for the working musician. If you play guitar or bass, violin, keyboard, a woodwind or even a brass instrument, or you are a vocalist, they've got a sound reinforcement product designed with you in mind. Great product designs go far beyond having the right knobs in the right places. Acoustic Image’s company charter is to design and build unique, innovative, and functional audio products... there is nothing "me too" about what they do. In essence, they have merged advanced acoustic design and switching amplifier technology to create incredibly compact, ultra-lightweight products offering highly accurate sound for serious musicians. Ultimately, their pledge to you is for quality... to build a well-constructed reliable audio product that serves you well night after night, year after year. And, quite frankly, they believe the best way to do that is to design and manufacture each and every Acoustic Image product in the U.S.A. Their Technology Applying "musical thinking outside the box", they have taken a different approach to the technology of musical instrument amplification in order to improve the performance and portability of combo amps for the working musician. So, what's so unique about their products? There are three key differences: 1) The use of downfiring low frequency drivers 2) The use of switching power amplifiers and switching power supplies instead of the traditional linear designs 3) The use of unique enclosure shapes to improve portability and sonic performance Each of these differences provides an improvement in the performance of their products. Here's how: The downfiring woofer makes a small driver sound bigger and allows a smaller enclosure for a given driver size. Omnidirectional output produces a more natural and more transparent sound, and means you are more easily heard on the bandstand. The switching (Class D) amplifier design is smaller and more efficient than traditional linear amps. It has less weight because there are no heatsinks or cooling fans and it has a unique "warm" sound (unlike traditional solid state amps) because its output stage is radically different from traditional amps. The switching power supply eliminates large bulky power transformers with a resulting dramatic decrease in weight. With their unique enclosure shapes, form follows function. A cylinder is an inherently stiffer enclosure. And no resonances in the enclosure walls means less coloration in the sound. Also, the stiffer enclosure allows the walls to be thinner and lighter in weight. Add to that the use of acoustically inert polymer materials and the cabinet becomes ultra light. We don't use these new technologies to “be different.” They use them because they make their products better. It all adds up to a more portable, better sounding products. Because of their small size and high sound quality, they virtually disappear on stage, leaving the sound of the instrument being amplified, only louder.


Serial Number: 0522

System (All Models)

Frequency Response: 30 Hz - 20 kHz (40 - 16 kHz ±3 dB), 50 Hz - 20 kHz (60 - 16 kHz ) Corus

Max SPL: >112 dB at 1 meter

AC Power: 115V/60 Hz or 230V/50 Hz, switchable

Size: 12” H x 15” W x 13” D

Weight: 20 lbs, 17 lbs (EX)

Preamp (Mic and Instrument Inputs through combo jack)

Mic Input: 600 ohm balanced, XLR connector

Phantom Power: 47 volts, on/off switch w/LED indicator

Instrument Input: 1 M impedance, 1/4 inch jack

Direct Out: +4 dB, balanced, XLR connector, ground lift, pre/post EQ selector

Effects Loop: Parallel type with return level control

Bass Control: Shelving type, ±15 dB at 60 Hz

Mid Control: ±15 dB at 650 Hz

Treble Control: Shelving type, ±25 dB at 10 kHz

Notch Filter: >-18 dB sweepable from 30 to 800 Hz

Low Cut Filter: -12 dB/octave sweepable from 30 to 800 Hz

Effects (Coda R and Corus)

Type: Digital with 6 presets and level control

Program: Presets 3 reverb (hall, room, plate), delay, ambient, chorus, flange

Power Amp (all models)

Topology: Class D (PWM)

Switching: Frequency 230 kHz

Output Power: >400 W, >500 W with 4 ext. cab.

External Speaker Output: Neutrik Speakon-type (pole 1), 4 min.

Speaker System (all models)

Woofer: 10 inch, downfiring

Midrange: 5 inch, forward firing

Tweeter: 1 inch forward firing with on/off switch

Crossover: Passive, alignment corrected

Impedance: 4

Power rating: 300W