Ok, I've finished 3 of the 5 XC-S speakers ...for now.
I am happily listening to a pair as I type this. A build
thread posting with photos will follow soon

Two of the XC-S work perfectly ...one doesn't.
(There's always one joker in every group isn't there?)
The faulty one has tweeter output that seems just fine,
but no sound(s) at all from the midwoofers.
My thoughts are that it is either at the W+ or W- output
lead(s) connection at the crossover board or where the
lead(s) connect to the + / - tabs on the first midwoofer?
There is also the chance the crossover board itself may
have a faulty midwoofer circut?
Please advise on the best trouble shooting pathway to
follow.
...also, the +/- is not marked on the Encore tweeter. I took
the wider, larger tab to be the + one? Is that correct?
Thanks