Retrofit Subwoofer on High Performance w/o Subwoofer

[IMAY2023]

On My S60 I used B&W AUD came from s90. I added MID range on the rear doors (had to add wire from AUD to door for MID + high channels)  and also upgraded the rear bench speakers with tweeter.  

Where did you mount those MID speakers? Is there room for it?

I wanted to mount them from inside but could not find any room. 
So, I build small boxes just to cover the speaker(s) and placed them in the storage are on the rear doors right next to woofer. 
The wiring; 
I tabbed the wire to the tweeter, pulled it down inside the door trim panel, made a tiny whole underside of the storage area where no one can see anyway.  
It's better this way, less place for the kids to put trash :-)