It can get better, but you won't get apodizing into a pair of 18-bit DSPs. You can feed anything up to 48kHz into them. In this case perhaps less is more.

I think it was VK who ran some custom filters on his SBT.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.