Hi Sorry if this has been covered before (probably has but I can't find it specifically on a search that I did), but I am wondering if you good people can explain a spec to me. On speaker specs that I have seen, there is sometimes / usually a nominated "db" rating. For instance, I believe that my speakers have an "89db" rating. I think I know that it has nothing to do with how loud the speakers is - possibly to do with sound quality...?? What does this refer to? Sorry if this is a lame question, but thanks for any help. Rob.