We measured the SR2 top filter optimal load and frequency with the CuBe blade.

We expected 31mm compression would have a wider load range butthe difference was not so big. And there is crossover point around a load of 20mm or 248.5kg.

From the viewpoint of load capacity, 32mm compression is better below this crossover point (keystone higher). CAD nominal was 16.5 mm and the SR3 needed 11 mm, so 32 mm compression will almost certainly be better.

And from the viewpoint of frequency, 32mm is also better than 31mm.

So we will set 32mm compression.