Info from L.R. Baggs.
At the heart of the Anthem is a revolutionary microphone engineered to capture a dynamic studio-mic’d sound for any live performance. The TRU•MIC mounts to the underside of the bridge plate and hovers just 3 mm above its surface to take advantage of the PZM or “boundary” effect. This proprietary mounting system, combined with noise cancellation, frees the mic to perform as if it were outside of the guitar in a studio and maintain remarkable feedback suppression for the stage. The result is a balanced frequency response with excellent clarity for the purest sound you have ever heard amplified. We have paired the Element pickup with the TRU•MIC to provide solidity and punch for low frequencies.
For those of you who prefer a minimalist approach to controls, the Anthem SL delivers the same groundbreaking studio mic’d fidelity as the Anthem in a streamlined format with a single volume control. The endpin preamp has all-discrete circuitry for the purest signal and the TRU•MIC is premixed with the Element for optimum performance.