Acoustic Image Double Bass Amp – Corus S4 Combo


Acoustic Image Corus S4 Combo Amp combines purity, power, and portability in a package that sets a new standard in high fidelity amplification. FREE USA SHIPPING!



The Acoustic Image Corus S4 is similar to the Coda, but has a different woofer for more forward sound that is more suitable for guitar than double bass. The Corus S4 has a 1×10 speaker configuration with a paper cone woofer and a 5 inch extended range driver with presence control in addition to the woofer. It is available with a one or two channel head which mounts directly into the cabinet. The amp head uses a class-D power amplifier with a switch mode power supply and a sophisticated, sensitive preamplifier. Every Acoustic Image design is engineered to accurately reproduce the sound of acoustic and electric instruments. Acoustic Image amps combine purity, power, and portability in a package that sets a new standard in high fidelity amplification. Upton Bass offers FREE DOMESTIC SHIPPING on the Corus.

The Acoustic Image Corus is available in a Corus S4plus Two Channel Combo (613 GA plus, $1529), Cabrio-Ready Corus EX  for use with a Clarus amp head (621 EX-C, $639), or as an extension cabinet (Corus EX S4, $599). PLEASE MAKE YOUR SELECTION IN THE CUSTOMIZATION TAB ABOVE BEFORE ADDING THE ITEM TO YOUR CART.

Features – Amp Head:

  • Extended frequency range, high fidelity sound
  • Light weight (
  • Unique, slanted front chassis
  • Mounts in cabinet using Cabrio Docking System
  • Separate XLR and 1/4 inch inputs in each channel can be used simultaneously
  • 48V phantom power and 10 dB gain select for mic input
  • Input level control per channel
  • Four band EQ per channel
  • Selectable phase reverse and sweepable low cut filter per channel (phase reverse can be converted to low pass speaker emulation filter with internal jumper option)
  • Effects loop per channel
  • Selectable reverb and delay effects with level and rate controls and pseudo stereo output
  • Direct out with selectable 10 dB pad, pre/post switch and ground lift-Headphone output
  • Switchable limiter
  • Mute switch
  • Mono or stereo output from the preamp section
  • Selectable internal jumper options for gain and stereo operation
  • High fidelity, low noise operation: 110 dB SNR at direct out
  • Automatic voltage switching for universal AC mains operation
  • 650 Watt output at 4 ohms (music power)
  • Dual speaker outputs with speakon connectors

Features – Speaker Cabinet:

  • Sealed two-way speaker system
  • Lightweight (22 lbs) structural foam cabinet
  • Downfiring paper cone 10 inch driver + 5 inch midrange with level switch
  • Comes with a fitted slip cover with shoulder strap

All AI amps are ordered when you order and typically have a 1 to 2 week lead time.  AI assembles all amps by hand and we’ve found that ordering them as we need them makes sure the most current product ships out to you!


Upton Bass is a double bass specialty company located in Mystic, Connecticut. We are ready to offer advice and answer any questions you have regarding your double bass, strings for your double bass, or related topics. Any questions? Email or call our shop at (860) 535-9399. Our hours of operation are Tuesday through Saturday 10 am – 6 pm.


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