L.R. Baggs M1 Series Acoustic Guitar Active Soundhole Magnetic PickupThe M1 Active features built in all class A electronics, so there's no need for any external preamps and it's compatible with any outboard equipment. The new volume control gives you fingertip access in any performing situation. The M1 is a humbucking pickup with a twist. In a common stacked humbucker, the second, lower coil cancels hum, but doesn't contribute anything positive to the sound. In fact, it can muddy the sound of the main coil. The M1