Hi, i was cruising around on the net and found torresengineering.com and found a PASSIVE midrange boost/cut that works on most guitars. I wonder if it would work on a P-bass? This would replace the usual tone pot. How useful! Can someone can tell me if the bass frequencies would work with this pot, should I throw out the idea, or pursue it????????????? I'm the type person that loves potential mods to enhance the sound of a typical bass. http://www.torresengineering.com/torsupmid.html
By definition passive controls can only CUT, not boost. The Torres circuit is probably cutting everything BUT mids in one direction and cutting mids only in the other. But it is not BOOSTING mids, this is impossible in a passive circuit. Gibson's Varitone (which uses inductors) and G&L's passive 2 band EQ are examples of passive circuits that can emphasize midrange by reducing bass and treble. You should contact Torres and see if you can easily tweak their circuit to drop the operating point of the control by an ocatve.
and if that won't work, you could consider Villex pickups which have a passive mid control as well as passive tone control.