They don't have to be expensive cables (how long will they be?) but good damping is a must. The D amp will provide good damping control, but high inductance cables (like zip cord) or really long cables, or both, will work against good control. Any good solid core or low-strand-count cable will be better than zip-cord, but the best inductance spec is NO inductance and that can best be achieved using separated runs (like Virtual Dynamics.) A cheap used pair of VD's will give you all the control the D amp can deliver. A double run is a good solution too as long as the cable you're doubling has low/no inductance as a single run.