Hi D9LLT. firstly here's a summary table of the F-Type speaker sizes, engineering and JLR part numbers that I compiled as part of the upgrade I carried out on my Meridian 380W system. Basically plug and play swap out of standard paper cone speakers, to the much more responsive kevlar coned Meridian Signature series fitted to high end XJ and LR models.
As you might detect, the rear 'woofer and tweeter' are not standard sizes. In fact there is nothing else in the JLR speaker inventory that can be used to upgrade the standard set up which looks like this -->
The rear tweeter is too big to be a 'proper' tweeter and the rear woofer is too small to be a 'proper' woofer, so they just do their best to fill in the sound from behind the seats, but don't add much to the staging as they are usually pointing straight at a seat back some 3 inches in front! In addition, replacing the rear speakers is complicated by the fact that the rear woofer is a 'twin coil' affair and is driven by two individual inputs from the 380W amp. There are very little replacement options to replace unless you ditch the factory amp and go for a new standalone. Altough this then throws up the issue of where to pick up a clean low level input for the new amp. The rear speaker combo comes as a fully moulded integrated unit, which entails either gutting the standard speakers or building a custom cabinet.
There's not much space to play with in terms of building a decent custom enclosure -->
and the space that is available is shallow and irregular in shape. Some owners have succeeded, but with a lot of ply, fiberglass, time and effort.
Finally, as you have the 770W Meridian Surround, you also have a 100mm co-axial mounted in the centre vent, but this can be upgraded using a Meridian Signature speaker.
There are a couple of good threads worth looking at over on the Jaguar Forums -->
https://www.jaguarforums.com/forum/f-type-x152-72/f-type-stereo-system-upgrade-planning-146775/#post1272309
https://www.jaguarforums.com/forum/f-type-x152-72/f-type-coupe-speaker-upgrades-230829/#post2211853
Personally, I went for the Meridian Signature plug and play upgrades for the doors (Kevlar cones, titanium tweeter) and the very rare Audison/Bold combo for the rear using second hand speaker frames. I didn't fancy the expense/effort of rewiring the car to mount aftermarket amplifier(s). No centre co-axial in my case (although the car does have a 100mm centre speaker, which is used by the Telematics system in case of accident). With a three layer sound proof application on each door the difference in sound quality after the changes was markedly improved with a much sharper and cleaner mid-range and a tight base underpining everything. For me it was the best price/performance combination, but then again I've been riding motorbikes most of my life, so my ability to appreciate high quality audio, is probably not the best
