I just hooked mine up and checked them out last night using unbalanced TS cables from a Yammy mixer. That's the only way I have available right now to hook them up.
Turned on the drum machine and played around a little. Not really possible to comment on audio quality from a drum machine, but I do like what I heard!
I'll patch in a CD player over the weekend and have a better listen.
Now that I have seen them in person, I think you have to be really dedicated to even consider the size of the 8" model!