Acoustic Chorus Guitar Amplifier

Faithfully Amplify the Natural Characteristics of Your Acoustic Guitar.


(Jun. 28, 2013)
The latest member of the AC family offers powerful, dynamic sound with exceptional portability. Meet the new AC-40!

(Jan. 14, 2010)
Please check the Acoustic Chorus Guitar Amplifier series AC-90, AC-60, and AC-33!

Faithfully Amplify the Natural Characteristics of Your Acoustic Guitar.

Until the Roland AC-100 Acoustic Chorus Guitar Amplifier, reproducing the full range of harmonic tones and subtle dynamics of an acoustic guitar without a respectable sound reinforcement system was disappointing at best. That's because guitar amps have traditionally focused on the needs of electric guitars. But the AC-100 is designed from the ground up to accurately amplify all of the deep lows and harmonically rich highs of acoustic and semi-acoustic guitars. It provides reliable anti-feedback control and other features specific to acoustics, and even offers digital chorus and reverb effects to give the acoustic guitarist the option of adding extra spatial dimension to the sound at will. The AC-100 is the perfect little amp for an acoustic guitar.

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  • - Unique Tri-Amp System (3 speakers with 3 dedicated amplifiers)
  • - 5"/25W + 5"/25W (for mid-highs and highs)—12"/50W (for lows and mid-lows)
  • - Distinctive chorus and digital stereo reverb
  • - Two independent channels, each with 3-band EQ and effects control
  • - Mic-level XLR input for vocal accom-paniment or guitar without pickup
  • - Built-in notch-filter for eliminating feedback and howling
Relevant product

Tri-amp system delivers a wider frequency range for a fuller sound.

Acoustic and semi-acoustic guitars produce a sound that covers a wide frequency range, and therefore need a special system of amplification. The AC-100's unique tri-amp system and two-way/three-speaker configuration accurately reproduce the deep lows and harmonically rich highs of acoustic guitars.

Two 5-inch speakers take care of the mid-to-high ranges, and a 12-inch speaker is dedicated to the mid and low ranges. The 12-inch speaker is powered by a 50-watt amp, while the two 5-inch speakers each have their own 25-watt amp. This setup gives you a full 100 watts of power, with a much wider frequency response than electric guitar amps.

High-definition chorus effect and digital reverb.

The AC-100 comes with a built-in chorus that features a high-definition DSP chip and a split-frequency space synthesis technique. An advanced version of the chorus used in Roland's famous Jazz Chorus amps, the AC-100's stereo chorus takes the naturally full sound of the acoustic guitar and expands it even further. The stereo reverb is also designed especially for acoustic guitars, resulting in a silky-smooth, high-definition effect. Both effects can be turned on or off independently via footswitch.

Anti-feedback function and 3-band EQ with shape circuit.

Because of their highly resonant nature, acoustic and semi-acoustic guitars can produce uncontrollable feedback. The AC-100 features a built-in anti-feedback function that effectively eliminates the feedback problem once and for all. Simply turn the knob to the offending frequency and forget about it!

The sound of an acoustic guitar is also extremely sensitive to different acoustical environments. That's why the AC-100 comes equipped with several functions that let you fine-tune your sound for any room. A high-quality EQ comes with low, mid and high bands, while a shape circuit enhances the edges of the sound. A high-pass filter circuit lets you clean up the "muddiness" from low-range sounds.

Independent two-channel inputs plus versatile output options.

The AC-100 is configured with two independent input channels that give you highly flexible performance options. For example, you can combine a "mic'd" acoustic sound with a pickup tone for a classic mixed texture. You can also use the other channel for a vocal microphone or a rhythm machine. Each channel has effects that can be turned on or off independently.

The AC-100 includes stereo phone jacks as well as pro-level XLR outputs that can be switched between post-effects and pre-EQ. Effect send and return jacks are provided for the guitar channel for connection of external effects devices.

100W (25W + 25W + 50W)
5" (12 cm) x 2, 12" (30 cm) x 1
Input (Hi/Piezo, Low/Active [Guitar Channel], XLR, Headphones [Mic/Aux channel] )
Line Out (XLR [A, B], Phones [A, B] )
Effects (Send, Return)
Footswitches (Reverb, Chorus)
Power Consumption
102W (AC 117/230/240 V)

Size and Weight

Width (W)
646 mm25-7/16 inches
Depth (D)
298 mm11-3/4 inches
Height (H)
533 mm21 inches
25 kg55 lbs. 2 oz.

All specifications and appearances are subject to change.


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