FxrAndy,
There was an old MBW 1675 (before my time on the forums) but it left a lot to be desired just like the 1655. Boy, if they could make a decent 1675 rep there would be a lot of interest. Maybe Josh and Andrew are working on it, I have to say their $198 vintage sub and SD options are not bad at all for the value.
I can only say for me personally that I was never that satisfied with my modded Silix 1675, in the end bought a gen 16750.