John Mayer’s Boss Blues Driver BD-2 (Keeley Phat mod)

Used by Mayer most notably during the trio era (circa 2005). The BD-2 that John used was modified by Robert Keeley altering the sound significantly from the stock model.

Among others, the mod includes changing several BD-2s inside components and adding a PHAT switch which activates a lower frequency booster for a somewhat bassier or “fatter” sound.


GroundGuitar counts on your criticism and feedback. In case you notice anything wrong with the information posted on this page, or you have knowledge of something that you would like to share, be sure to leave a comment below.

In case you want to talk to me directly and privately, please use the Contact Form and I will get back to you as soon as possible. (Dan)

Notify of
Inline Feedbacks
View all comments