No, but this monitor is well behind the mains (~30") and the entire front wall is already reflective (per Northward's design). If the front wall was absorptive or diffusive there would be an increased chance of audible change, but in some extended listening before and after I can hear no change.
My basic chain would be DAC -> Crane Song Ibis -> BPEQ -> Davelizer -> Pendulum OCL-2 -> Crane Song STC-8 -> Wedge EQ -> ADC