The Shure A15PRS is a compact, switchable in-line phase reverser that allows quick correction of phase issues in audio systems. Ideal for multi-mic setups, stereo recording and troubleshooting signal problems, it lets you invert polarity with a simple switch to improve coherence and reduce comb filtering. Housed in a rugged metal casing for reliable long-term use, the A15PRS offers an easy, effective solution for achieving cleaner, more accurate sound in live, studio and installed environments.