Seymour Duncan SA-1 Acoustic Tube Application: Quick-mount, passive, magnetic soundhole pickup. Description: Lower impedance, instant-mount, hum-canceling Stack® pickup housed in a tube with a built-in volume control. The tone is flat, warm and natural. Perfect for live situations that require on-board volume control. Extremely feedback resistant. Includes short cable with 1/4" female jack. Complete setup: For optimal tone, plug into an acoustic guitar amplifier, P.A., or mixing console. Guitars: Acoustic guitars with sound holes between 3.85" and 4.10." Players: David Hidalgo / Los Lobos, Mike Stone / Queensryche, Buddy Whittington / John Mayall's Bluesbreakers Get your Seymour Duncan SA-1 Acoustic Tube today!