Acoustic Guitar Processor


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 high-end acoustic guitars. The versatile AD-8 can also simulate the warm sound created by miking the guitar's neck and body -a world's first!

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. *All trademarks are property of their respective owners.

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 )
250 mm
9-7/8 inches
180 mm
7-1/8 inches
60 mm
2-3/8 inches
1.9 kg
4 lbs. 4 oz.
* 0 dBu = 0.775 Vrms
*The specifications are subject to change without notice.


If you have questions about operating your BOSS product, please check our Knowledge Base for answers to the most common questions.
You can also contact our Product Support department by phone or email.
In addition, we have a library of Owner’s Manuals and Support Documents that you can download and reference.

Owner’s Manuals

Support Documents