[Spring clip connections]

I just received my R-1650-CSM speakers in the mail.  There are two pairs of input connections.  I can't for the life of me find out which connections to use.  The literature that came with them simply tells me to connect them to my amp.   I can find nothing on-line and Klipsch Support tells me to wait up to 7 days for them to respond... Grrrrr

[Sound proofing first floor]

I put a 13 gallon trash bag in the speaker hole then sprayed expanding foam into it and sealed it with a rubber band.  I tucked a pillow into the hole to achieve a convex void until the foam hardened.  It's not perfect, but I got good results.