Rich, deep, stereo sound to go — introducing the AC-33, the world’s first battery-powered amp made specifically for acoustic guitar. Portable yet powerful, the AC-33 provides true stereo sound, Guitar and Mic/Line channels, custom-tailored effects, anti-feedback, and a Phrase Looper. But this amp was made to go places no amp has gone before. Thanks to its battery-power capability, the AC-33 lets you take your act anywhere: into the backwoods, onto the streets, or wherever your imagination leads you.

New Rosewood Finish!
Now the AC-33 is available with beautiful rosewood-look cabinets, offering an alternative to the standard stage-ready black finish. The attractive woodgrain styling perfectly matches the atmosphere of your living room or studio, as well as the aesthetic of your acoustic guitars.



  • 30 watts (15W+15W) of natural, stereo acoustic sound through twin speakers
  • Runs on AC power or eight AA batteries (accepts rechargeable NiMH types)
  • Dual-channel configuration: Guitar and Mic/Line channel
  • Reverb, chorus, and ambience effects (Ambience adds spatial, 3D-type depth to the sound)
  • Phrase Looper with 40 seconds of record time
  • Stereo AUX input (connect MP3/CD players, etc), headphone output
  • Anti-feedback function
  • Built-in tilt-back stand
  • Removable battery cartridge for easy battery replacement
  • Now available in rosewood finish (model # AC-33-RW)

Natural, Stereo Sound

Equipped with Roland’s latest DSP technology, the AC-33, delivers pure, rich acoustic sound with projection far beyond its size. Its true stereo design (15 watts x 2) enables brilliant stereo/multi-band chorus with “Wide” mode, plus shimmering reverb and 3D-type ambience effects tailored specifically for acoustic guitar.

Phrase Looper

The AC-33’s onboard Phrase Looper lets you record, loop, and jam over your own guitar riffs or incoming audio from the AUX input. Record and loop up to 40 seconds at a time, and amaze your listeners with sound-on-sound performances that you create on the spot.

Strum and Sing

The AC-33 provides two discrete channels: Guitar and Mic/Line. Plug in an acoustic guitar and a microphone (or line-level instrument) and mix them separately. Both channels have dedicated controls for volume, multi-band EQ, and chorus. The Mic/line channel offers both XLR and 1/4″ inputs. You can also connect an MP3/CD player to the stereo AUX input for play-along practice or performance. Master volume, reverb, ambience, and anti-feedback are provided as well.


                    Rated Power Output

                    15 W + 15 W (when using the AC adaptor)
                    10 W + 10 W (when using the Alkaline batteries)

                    Nominal Input Level (1 kHz)

                    GUITAR Channel: -10 dBu
                    MIC/LINE Channel: -50 dBu/-20 dBu
                    AUX IN: -10 dBu

                    Nominal Output Level (1 kHz)

                    LINE OUT: -10 dBu


                    12 cm (5 inches) x 2


                    [GUITAR Channel]
                    VOLUME Knob
                    BASS Knob
                    MIDDLE Knob
                    TREBLE Knob
                    CHORUS Switch (OFF, SPACE, WIDE)

                    [MIC/LINE Channel]
                    VOLUME Knob
                    BASS Knob
                    TREBLE Knob
                    CHORUS Switch (OFF, SPACE, WIDE)

                    REVERB/AMBIENCE Knob

                    ON/OFF Switch

                    REC/PLAY/OVERDUB Button
                    STOP/CLEAR Button

                    [AUX IN Controls]
                    LEVEL Knob
                    MASTER Knob
                    POWER Switch


                    REC, PLAY, OVERDUB


                    GUITAR Channel Input Jack (1/4-inch phone type)
                    MIC/LINE Channel Input Jacks
                    (XLR type, Balanced)
                    (1/4-inch TRS phone type, Balanced)
                    AUX IN Jacks
                    L, R (RCA phono type)
                    (Stereo miniature phone type)
                    LINE OUT Jacks L (MONO), R (1/4-inch phone type)
                    PHONES Jack (Stereo 1/4-inch phone type)
                    FOOT SW Jack [EFFECTS] (TIP: CHORUS, RING: REVERB/AMBIENCE) (1/4-inch TRS phone type)
                    FOOT SW Jack [LOOPER] (TIP: REC/PLAY/OVERDUB, RING: STOP/CLEAR) (1/4-inch TRS phone type)
                    DC IN Jack

                    Power Supply

                    AC Adaptor (included, DC 13 V),
                    Dry battery LR6 (AA) type (alkaline) x 8, or
                    Rechargeable Ni-MH battery (AA, HR6) type x 8

                    Current Draw

                    490 mA

                    Expected battery life under continuous use

                    Alkaline battery: Approx. 8 hours
                    Rechargeable Ni-MH battery (AA, HR6): Approx. 9 hours
                    These figures will vary depending on the actual conditions of use.


                    Owner’s Manual
                    AC Adaptor
                    Power Cord

                    Options (sold separately)

                    Footswitch: BOSS FS-5U, Dual Footswitch: BOSS FS-6, FS-7

                    SIZE AND WEIGHT


                    318 mm
                    12-9/16 inches


                    223 mm
                    8-13/16 inches


                    243 mm
                    9-5/8 inches


                    4.7 kg
                    10 lbs. 6 oz.

                    PERFECT SOUND

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