Below you’ll see the FR curves for the Tang Band 3″ full range driver. Both curves are with the driver in the the box, measured at 0.5m but normalized to 1m/2.83v so the sensitivity is 80dB. There is 5-6dB of net baffle step correction. Two curves are shown. The black curve shows the response with a simple parallel LCR trap. The red curve adds a LR shelf. It appears the LR shelf to roll off the rise above 8k isn’t necessary, but makes the curve look better. I’m not bothering with the shelf in the final design. Full range drivers roll off anyway off axis much more so than a typical 2 way with 1″ dome, so peaking isn’t really noted. The 15 degree off axis curve for the unit without the shelf looks just like the red curve, so toe the speakers if you think you hear the rise.