Boss AD-2 Acoustic Preamp

  • By Nick Rambo @tonereport
  • March 11, 2017


I’ve been playing more acoustic gigs lately. And if I’m being completely forthright, my tone hasn’t exactly been spectacular.

Now look, my Breedlove Passport C250/CME is probably one of the best acoustic guitars you can get for the money—I nearly stole mine for a scant three hundred bucks out the door—but plugged straight into the board, it sounds a bit lacking. Dull. Flat. Boring. Pick your adjective.

Of course, I could blame this on the constant rotation of sound guys I work with, the limited control set on the guitar itself, the reflections in the room or perhaps even the solar positioning of the earth and moon in relation to Jupiter—but I’m not a guy who likes to make excuses.

This is where the Boss AD-2 Acoustic Preamp comes in.

Au Naturale

The AD-2 promises quite a bit: natural, studio-quality acoustic sound while performing on stage. And let’s be clear—somehow replicating the complex resonance of an unplugged acoustic guitar through an amplified system is no small feat.

Let’s just say that I went into this experience with a healthy dose of skepticism.

During my first set with the AD-2, I set the Acoustic Resonance and Ambience controls to noon. Later, I cranked the Ambience knob all the way up, but was pretty happy with the amount of resonance and left that alone. And that was that. I was sold.

Allow me to explain.

Due to their designs, most acoustic guitar pickups just aren’t able to reproduce the same rich, resonant complexity that unplugged acoustic guitars are know for. The AD-2 steps in, listens to what you’re playing, and thanks to some “sophisticated under-the-hood processing with multiple interlocked parameters,” does its best to recreate that complexity.

And—honestly—I think it works. Of course, higher settings on the Resonance control can sound overly processed, but I tend to be more of a strummer than a fingerpicker on acoustic, so your style might dictate otherwise. But even when I handed my guitar to a buddy and went out into the house to listen to some A-B testing during a break, there was no doubt that what was coming through the PA sounded more dynamic—and downright better—when the AD-2 was engaged. Even the drummer agreed!

Bag of Tricks

Aside from its primary function, the AD-2 packs in a few other nifty features.

Foremost among them is a studio-quality reverb that’s been optimized for acoustic guitars (controlled by the aforementioned Ambience control). That said, if you’re a reverb geek—don’t get too excited. Even maxed out, the reverb is fairly modest. But it is great for adding just a little bit of space to your sound, with an emphasis on the words “little bit.”  Even if reverb isn’t your thing, you still might find yourself inching that control up on the AD-2.

Other tricks include a notch filter for feedback reduction, a pair of outputs for connecting your guitar to an amp or a PA and a mute function for tuning or switching guitars on stage.

There’s also a hidden option that allows you to split out the ambience and process it separately on the board. 

What we like:

What the AD-2 may lack in sex appeal, it more than makes up for in utility. This is a great tool for acoustic guitar players looking to enhance their sound on stage. And it’s Boss—so you know it’s built to last. Plus, for only $99, it’s something you can just as easily throw in the bag as strap down on the pedalboard. There’s plenty to like here.


All told, I used the AD-2 for about four, maybe five hours and in that time it ate through the nine-volt battery it shipped with. Now, this test was hardly scientific and for all I know, the battery was almost dead when I got it—but if you’re someone who likes to go with battery power, make sure you have a backup (or two) in the gig bag.

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  1. Robert

    The 9V battery that Boss boxes are shipped with is primarily for factory testing before release. It’s not the caliber of a typical fresh Duracell, etc. 

    While the use of a regulated 9v AC supply is always preferable in my opinion, you’ll do better to replace the factory 9 volt with a fresh alkaline for actual performance purposes.

  2. Nick Rambo

    I completely agree, Robert. In truth, I actually bought an AD-2 for my own purposes and found it to be a battery eater—even with a fresh Duracell. I’ve since strapped it down on a mini board with a Pedaltrain Volto, which holds up much better.

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