This will be phone call week Paul.
I have 4 JL subs and have had problems with repair on one that would not turn off from brand new. I received a 45 minute sermon/lecture/his long credentials on how this was normal and how smart the Support guy was, when my other 3 JL subs worked fine and everyone I know who owned JL's worked fine (A lot on the net.).
PS. He tried to sell me a sub but I went through my local vendor, much cheaper, which aggravated him. Which I believe has led to little support help.
On the flip side.
Carl Kennedy was great with advice and all round set up help!
Not sure if he still even works there.
Are the last 2 numbers on the serial #, the year manufactored?
Thanks!