Aaron,
Typically best place for them is plate loads but you have the c4s on the drivers and plate chokes on the power sections, but the current setting resistor on the c4s is a good place for these. Not sure I'd want to use them for bias resistors, but I guess it can't hurt to try.
HTH,
Jim
Jim Rebman -- recovering audiophile
Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).
s.e.x. 2.1 under construction. Want list: Stereomour II
All ICs homemade (speaker and power next)