Street Sound Plus (they have a web site) on Roscoe Bl just west of Woodley.
I have done a couple cars and the boat there. Talk to Tom, they do good work and are fair priced. He can give pretty good advise on ideas if your lost. They are big on Jl, Alpine, but they have alot of other brands too...Good luck...oh ya i've heard that Mobile Fantasy on Reseda is good but neved had any work done by them.