Sorry to harp on about this but....

What is the maximum depth and width custom cut rear panels take?

Anyone got the midrange Kenwoods at 6inches or the Focals 5 1/4?

 

I will add to this, how about Focal 5 Ws 5" subwoofers?
Has anyone used these behind the seat?

 

The critical measurement for speakers behind the seat is the magnet diameter. You can check on Lucids site for this diameter. Otherwise you will have to trim a little metal from behind the seat. That is what I did to install 4" Boston's behind my seats.

Hope this helps.

 

Try this thread.

 

Based on the magnet diameter off of the the Focal America site:
http://www.focal-america.com/catalog/utopia/5ws.htm

It states the magnet diameter of the 5 Ws is 4" You could probably fit it, however, you will need to do some metal cutting behind the seat to get it to fit.

 

i had some trouble putting in 6.5" speakers (the magnet bumped against the metal). instead of cutting it and risking the integrity of the vehicle, i added spacers to the speaker. that said, you do lose about 1/2" of recline space to your seats.