New owner of CF3's version 3 it looks like SN# 279590115 and 279590110. From the pic included, 110 has a rattle on the back when the bass hits. I know, from reading this is common it seems. When I put the smallest pressure on the back panel it stops. My other speaker is fine, but how do I get the back panel off? Or is everything accessed through the woofer holes? I know the proper way is to install bracing but just wondering if there is something smaller that would work since it takes such as light pressure to make it stop on that one box.
Love these things,, and heavy.