- The Reference Calibration kit is recommended for highest quality speaker measurements and is used for setting up the HDP-4, HDP-EXPRESS II, PreMATE and MATE units

Kit includes:

- 1 x Calibrated Earthworks M23 balanced measurement microphone
- 1 x 7-meter Professional Assembled Microphone Cable
- 1 x 5-meter USB Cable
- CD containing DEQX™ Calibration Software (DEQX-Cal) for use on Windows PC or laptop