"GNR/MED/RAW M25" is based on and seeking to recreate the sound of pre-Rola 12 inch, 16-ohm, 75-Hz Pulsonic cone Celestion® T1221 G12M-25 speakers made in March of 1971.

The speaker was shot in such ways as to result in three distinct voicings:

GNR = Greatly Neutral Response
MED = "Median"; between GNR and RAW
RAW = wild, hairy, and untamed