Thanks for all the info guys, much appreciated.
It was to add a sub to the kenwood aftermarket stereo and speakers that have just gone in. It just needs a little more low down oomph!! Nothing that makes the windows bow in and out to the beat.
I wanted oem as possible, hence getting the centre speaker cover and bracket.
One: for neatness and originallity,
two: space saving as much as possible.
Thanks to the replies it would seem to difficult to try and replicate the original setup and amp with the aftermarket stereo,
so best option seems to be to source a 6x9 sub to use in the original bracket, and power it from a new small amp.
Now to find a small neat amp to do the job without taking up too much boot space.
