The controls (for the Z7) are listed as "Volume/Tone, Blender, Treble, Middle/Freq, Bass" - the Marcus Heritage-3 with Middle Frequency Control has a passive mode, on the V7 there's a toggle switch for passive/active, I guess on the Z7 they've hidden it on a push/pull for aesthetic/control plate space considerations.
Z3 has no passive mode AFAIK. It does have a 3 band EQ though. Volume, Treble, Mid, Bass.