So I had a look to see why.
Turns out fitting them in the dark in my Dad's garage may not have been the smartest move... Made sense at the time though - it was warm, dry, the original speakers were still in, so I popped the grilles off, unscrewed standard speakers, disconnected, plonked shiny new JBLs in. Job done. (after the well documented removal of the spacer rings)
This morning, Iwhipped the grille off in daylight, and for the first time noticed the MAHOOSIVE gap between the speaker basket and the surround.
![Image](http://i839.photobucket.com/albums/zz311/fonzooorooo/door%20speakers/100_1095.jpg)
I know it's not screwed in in the pic, but it's in the position where it sits when screwed in... and that's a 4mm drill wedged in!
So, that'll explain the lack of bass then; phase cancellation.
So I made a couple of these:
![Image](http://i839.photobucket.com/albums/zz311/fonzooorooo/door%20speakers/100_1097.jpg)
Not the most elegant - Just a lash-up in 6mm MDF to see what it sounded like.
Better... but there's then this gap (where the pencil is):
![Image](http://i839.photobucket.com/albums/zz311/fonzooorooo/door%20speakers/100_1098.jpg)
Next plan is to chop another bit of MDF to fit that gap, then glue on.
Updates to follow...