Seymour Duncan SA-1 Acoustic Tube Stack Demo. The Acoustic Tube SA-1 is a quick mount passive and magnetic soundhole pickup which will fit in spaces between 3.85" to 4.10" and features hum-canceling, lower impedance, a flat tone and a built-in easily-accessible volume control. It comes with a short cable and female 1/4" output jack that can be connected to a standard guitar … [Read more...]