It looks like the 10’s are no longer listed on the Underwood website.
I’m curious about the upcoming Signature 80’s… Cabinets look similar to Legacy Studio. Moving from the rear radiator to a more conventional rear bass-reflex port is interesting, as is the ribbon tweeter.
I will say the review leaves me wondering if the Sig 50 makes the Sig 10 almost superfluous at least sonically?