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16.5 fit just get the thinnest depth as that is the worry of the window glass hitting it.
Sorry to drag up an old thread, but does anyone know what the depth must be to avoid the window glass hitting it?
I think I should be fine then. I'm planning to make it out of mdf as well.
I've found some I want to buy, only there from the US. This wouldn't cause any problems with connectors or anything would it? Just to check...

Glad some one agrees! Sorry forgot to mention you do need adapter as the standard ones are mounted in plastic, I got some from ebay.
thanks rich, although you've put doubts in my mind now...
what speakers is it you're looking at?