Switchable Phase Reverser. The Shure A15PRS permits instant switch selection of either normal or reversed phase (polarity) in any balanced line (including microphone or line level) cable. The phase reverser can also be used to connect unbalanced high impedance microphones with the "hot" conductor on pin 3 to inputs with the hot connector on pin 2 or vice versa.
The A15PRS is symmetrical and can be used in either direction.
Input: any impedance, any level
Output: an impedance, any level
Designed for connection to Cannon XL series, Switchcraft A3
Full magnetic shield, steel with gray enamel finish
19 mm (3/4 in.) diameter; 141 mm (5 17/32 in.) long