2cj, I suggest you study your manual if you received one. In my Duntech Princess owner manual John Dunlavy stated that factory frequency response measurements were made at a distance of 3 meters. This distance allowed the sound from the five drivers to converge properly at the mic. I can't imagine he would have taken measurements in any position other than one to achieve optimal performance.
If not exactly the same, I'm sure your SC-IVs have driver positions very similar to the Princess. I used 10' listening distance with my Princesses.
If not exactly the same, I'm sure your SC-IVs have driver positions very similar to the Princess. I used 10' listening distance with my Princesses.