Can I Run Romex Wire Between Joists In Photo?

[monteverdi]

Why not use BX I.e. metal clad wires instead of NM (Romex). Should have much better noise rejection as it is twisted and screened and rodent  proof. I have to renovate my house which still has a lot of post (knob) and tube wiring and that is terrible considering safety and electrical noise issues (single spaced wires). At least for my listening room I am planning 10 or 8 awg (not much cost more if one does not get audiophile grade).