First post so hi everyone

I expect you're all thoroughly bored with vague newbie posts asking what's the perfect JBL or Altec for me so I won't ask though I confess to not having a clue!

Instead I'm scratching my head trying to understand the logic (if there is one) behind the JBL model numbering. Would help hugely to get an idea of what to look for if someone could explain how it works.