I use a wider than recommended spacing of my Dunlavy's with my Sigtech. I used some room design software and RTA room measuements to determine the places where the room modal response problems were minimized. Then I picked a wider than recommended placement to listen to orchestral music. With any DSP, the algorithims are based on some assumptions about speaker placement. If you get to fr out of the assumtions the correction curves won't automatically hit the targets. As with my previous posts, you don't know for sure how close you are to the target curves on the Tact without independet realt time measurements. Have fun with your Tact.
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