APA-2
The EMG-APA-2 Acoustic Preamp has been designed with the needs of acoustic players in mind and is the perfect complement the AT93 and AT125 pickups. It combines a miniature, low-current draw preamp and a 9 volt battery holder in a single package that attaches to your guitar's front block (at the internal joint between body and neck) with two screws.
The natural output impedance of a film or crystal pickup element is much higher than that of a traditional magnetic pickup. If you plug the output of a piezo directly into a conventional amp input, the impedance mismatch causes a loss of signal output along with a huge loss of bass - you get a brittle and unpleasant sound (sound familiar?). The APA-2 features a very high input impedance (2 Megohm) to allow the piezo pickup to deliver powerful, natural sound across the entire frequency range.
In addition to the piezo input, the