When you’re mixing down a track, set up two mono reverbs, such as plates, with one panned hard left and the other panned hard right. Now you can send mono tracks to either or both reverbs as you see fit. Using mono reverbs in this fashion allows you to have the reverb show up opposite the original track in the stereo field, or to place the reverb directly behind the original track if they’re both on the same side. But you can still get “stereo” effects by running a source through both mono ‘verbs.
Using mono reverbs in this way will add space and ambience while controlling the build up of excess reverb and background wash.
Credit where credit is due: this tip comes from a workshop presented by iconic engineer/producer Frank Filipetti during Sweetwater’s GearFest ’09.