Acoustic Guitar Processor

Models Six of the World’s Finest Acoustics!

  • COSM


The Pedals that Make the Tone
With their unmistakable killer tone, BOSS pedals continue to define the sound of today's rock music.

Models Six of the World’s Finest Acoustics!

The BOSS AD-8 Acoustic Guitar Processor uses COSM® modeling technology to transform the piezo pickup sound of an ordinary acoustic into six of the world's most sought-after acoustic guitars. The versatile AD-8 can also simulate the warm sound created by miking the guitar's neck and body. Other handy features include a pro-quality reverb tailored for acoustic guitar, 4-band EQ, a convenient Tuner function and preset memories.

  • - Floor-based acoustic guitar processor featuring COSM Acoustic Modeling technology
  • - Turns ordinary piezo-equipped guitars into six of the world's finest acoustics
  • - Body and String Enhance controls simulate warm, miked acoustic sounds
  • - Sculpt your tone with high-quality reverb and 4-band EQ
  • - Auto Anti-Feedback function eliminates feedback instantly
  • - Onboard chromatic tuner with Mute function and quick pedal-based operation
  • - 4 Preset memory locations for switching acoustic sounds instantly
  • - Balanced XLR outputs allow direct connection to PA systems
Relevant product

New COSM® Acoustic Modeling

Nothing beats the sound of a fine, miked acoustic, but budgets and feedback issues often force musicians to use a more affordable electric-acoustic instrument with often thin-sounding piezo pickups. Thanks to the AD-8's innovative COSM Acoustic Modeling technology, you can transform your ordinary acoustic guitar into one of six high-end guitars like Martin and Gibson-a world's first! The AD-8 even simulates the popular “miked acoustic” sound via its Body and String Enhance controls.

Flexible Tone Editing

The AD-8's high-quality reverb effect was designed specifically for acoustic guitar. The reverb can be adjusted to create anything from a slight touch of ambience all the way to rooms and halls-perfect for adding spaciousness to your sound. And with onboard 4-band EQ, you can shape your tone to suit any style of music or venue.

A Live Performer's Dream

Designed with the stage musician in mind, the AD-8 offers several convenient features for performance, starting with an onboard tuner based on BOSS' acclaimed TU-Series. Just click the pedal to mute the guitar sound and tune up while referencing the LED display. Onboard memory lets you store your favorite settings and switch between them instantly, while Auto Anti-Feedback eliminates embarrassing feedback.

Professional Connections

In addition to unbalanced stereo outputs and a dedicated Electric Guitar Amp output, the AD-8 comes with a pair of XLR outputs. These balanced stereo outputs are true DI-complete and include a ground lift feature for eliminating hum. They're the perfect way to connect to a PA system or to professional recording gear. With the BOSS AD-8, you'll sound great whether on stage, at home or in the studio.

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Nominal Input Level
-20 dBu
Input Impedance
20 M ohms
Nominal Output Level
-20 dBu
Output Impedance
PHONES: 33 ohms
Recommended Load Impedance
10 K ohms or greater
Reference Pitch
A4 = 438 to 445 Hz (1 Hz steps)
Tuning Accuracy
+/-3 cents
7 segment LED
INPUT Jack (1/4" phone type)
PHONES Jack (Stereo 1/4" TRS phone type)
ELECTRIC GUITAR AMP OUTPUT Jack (1/4" phone type)
Unbalanced Output A (mono), B (1/4” phone type)
Balanced Output A, B (XLR type)
AC Adaptor In (PSA Series)
Power Supply
DC 9 V; Dry battery (R6/LR6 (AA) type) x 6, AC Adaptor (PSA Series)
Current Draw
120 mA
Dry battery (R6 (AA) type) x 6
AC Adaptor (PSA Series)

Size and Weight (excl. AC adaptor)

Width (W)
250 mm9-7/8 inches
Depth (D)
180 mm7-1/8 inches
Height (H)
60 mm2-3/8 inches
1.9 kg4 lbs. 4 oz.

* 0 dBu = 0.775 Vrms

All specifications and appearances are subject to change.


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