Cleveland - I've been in the custom integration business for a long time. Back when I started they didn't even call it that. In fact, there really wasn't a name for it. Custom AV is probably the closest. Then along came home theater and we got pigeon-holed as doing that.
So it's tough to explain what it is I do for a living. In those early days I really enjoyed going to the industry trade shows, mostly because I was surrounded by thousands of people who did the same kind of work and had the same problem in explaining it to the unfamiliar.
It's fun to come across a story that does explain the custom integration business. Here's one just published by the Springfield News-Leader, Bringing theater into your home. The subject of the article, Mitch Smith, has been in the business for about the same amount of time as me. So I'll let him tell you what I do.
If you have a question or if I may be of service email me at email@example.com