L.R. Baggs ANTHEM SL Acoustic Guitar Pickup I had it installed on a J-45, so I believe it can be used without any problems. The "Tru-Mic" is designed to accurately capture the actual sound and tone of the guitar above 250Hz. It also has amazing feedback resistance compared to other microphones. The "Element" pickup, which is set under the saddle, covers the low frequency range below 200Hz with a crossover, and outputs a punchy and core sound.