DPA DUA0019 is a 19mm spacer for a microphone boom. For the arrangement of a coincident XY stereo or near coincident (including ORTF or NOS) stereo configuration, the stereo boom can be fitted with two directional microphones and DUA0019 Spacer for Stereo Boom. To keep identical vertical aiming of the microphones, the DUA0019 Spacer for Stereo Boom should be used.