2 x 1961 1S data better than one 1723 2S ?
As far as I know, placing 2 subs next to each other results in +6db gain, and placing them apart results in +3db gain. The CEA 2010 data for both the 1961 Subwoofer 1S and the 1723 Subwoofer 2S then implies placing 2 of the 1961 1S next to each...