A:AnswerCheck if what kind of horn tweeter it's in the synergy 20.
I believe the reference k-26 n -15m use the 9*90 horn.
Your best bet will be to contact Klipsch.
A:AnswerThey were just on sale again last week, it ended on Sunday. I just check every week as I'm also piecing together a Klipsch speaker system as the items go on sale. Hope you were able to get your speakers!