Bartolini 3AV Soundhole Acoustic Guitar Pickup
*The B-string is typically has more metal mass than the high E-string and the solid cores of the wound strings. For that reason, the pickup compensates the B-string to ensure even output of all 6 strings.
Bright, clear hum-canceller (stacked coil) with B-string compensation
The adjustable brackets fit most soundholes from 3 7/8 inches and larger.