I have a Lifestyle 18 system which is about 6yrs old. For some reason, it has lost amplifcation. At a volume level of 100, it sounds like it used to at level 50. I've checked the connections and everything seems to be ok
Curiously have you attempted to unplug your system from power for a full two minutes and then plug it back in? Also, is this issue occurring while listening to a particular source such as the cable box? If so does the same issue occur on a different device connected to the Lifestyle?
Let us know the answers to those questions and we can take it from there! Thanks!