Just wanted to say to Shane - Wow. What an excellent answer. Think I would have to read it a few times to understand. So glad I joined this forum.Very very cool.
I appreciate your very fast response "down under". I have just updated firmware & installed band manager which is showing everything is ok. At the moment my one bass bin is working as it should now I'm configuring for the second. I think it may be something inside. I have to use them this wk d & for a big function next wk d ( I'm bringing backup powered subs) and then if the problem persists I'm dropping them off at my local Crown center. How are those Shelia's there mate. My dad served in Australia during WW2 as a pilot on the Lancasters.