A guitar rig where the dry, unprocessed guitar signal is sent to one amp and speaker(s) while a second signal, featuring the wet signal from delay, reverb, chorus, and/or other effects is routed to a completely separate amp and speaker(s). In other words, one amp receives the pure dry guitar signal, while the other only receives signal that has been processed with effects.
A wet/dry rig not only provides a wider, deeper soundstage for the guitar, it maintains the punch and presence of the dry signal, and is more open and clear sounding than when one amp is used for a blend of both the dry and effects signals at the same time.