Hello fellow Acousticians, After finding an extra room that will for mixing/mastering, fallowed by then picking the right monitors for your room and ears, finding the best monitor placement and listening position within the room, next step is creating an RFZ, right? My question is whether or not to treat first reflections on the rear wall with QRD Diffusor's or with broadband absorption .. I know probably to an extent it is a room by room dependent type situation. My new control room will be 19ft 6in long X 9ft 10in wide X 8ft 11in tall. The reason I'm not just automatically opting for diffusion on the rear wall is due to the fact I've heard conflicting opinions with some saying that "treating the rear wall with diffusion will make the mixing environment too lively and that you're better off just treating those rear-wall-first-reflection-points with absorption so that you're brain and ears will have an easier time deciphering the sound from the monitors and the sound of the room".