• Account
  • View Shopping Cart

Menu Search View Shopping Cart Call Us

Acoustic Image Contra S4Plus 1-Channel Combo Amp  From Acoustic Image

Affordable and completely professional. The standard in portable bass amplification!

Acoustic Image Amps

What We Think

The Contra has been re-designed and priced better than before! While the Coda series of amps have been the standard in acoustic bass amplification for a while now, the Contra is now back on the scene and ready for your low frequncy acoustic instruments! Sounds fantastic with both electric or acoustic bass, especially. Works wonders with cello and similar stringed instruments. 

It's super lightweight and portable. Huge factor for the gigging musician!

Manufacturer's Description from Acoustic Image

With 300 watts and one channel, Contra delivers AI sound and innovation for professionals who require less power and fewer features.

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.


Balanced, high fidelity sound

Two-way sealed speaker system

10" downfiring woofer

5" extended range driver

Lightweight (22 lbs) molded polymer enclosure

One channel preamp, no effects

Four band EQ preamp section

HiZ and LoZ 1/4 inch inputs

Input and master level controls

Effects loop

Sweepable Low Cut filter

Balanced direct out with ground lift and 10 dB pad

Mute switch and Pre/Post EQ for direct out

300 Watt switch mode power amplifier, internally limited

Automatically switched dual voltage operation (100-115V/220-240V)

Comes with a fitted slip cover with cord storage pocket and shoulder strap