Notes: /Z/, like /S/ has an area of strong frication between 2500-8000 Hz, starting somewhat lower than /z/ or /s/. Since it is voiced, look for glottal pulses below 500 Hz; the voicing may also show up in the frication itself.

A typical /Z/ may look like:

Speaker: Tim Carmell
Word: the /Z/ section of the word "measure"