I did the recommended speaker upgrade a few months ago, along with sound deadening on the door sheet metal. After doing one door completely I used my phone to fade back and forth instantly between the left and right channel, so I could A/B the change, and the difference between the two was really minimal to my ears. It sounded slightly better, but for the $500 I spent on the new speakers I wouldn't recommend it. The sound deadening is probably worth it though.

The biggest improvement I got was fading everything to the front in the EQ, so it would stop trying to play vocals and stuff from the crappy speakers behind the seats. That was actually a pretty significant improvement. I still need to do some felt tape in the back panels to cut down on all the rattling there though.

 

I did about the same thing as FtypeATX on my 2014 XJR. I did find that the reference Kevlar drivers sounded better. I replaced all 4 woofers in the doors plus the two subs in the rear deck. Along with a good bit of sound damping pads in all 4 doors. Plus more pads installed behind the rear seat and on the rear deck and then used what I had left on the trunk. Left the tweeters in the door and dash area's alone.

Yes the reference system's biggest change/improvement is providing sound to the rear seat passengers using those speakers mounted in the backs of the front seats.
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Bah, sorry for resurrecting this old thread, I was actually trying to reply to an F-Type thread and got magically sent over here by the forum suggestions thing. That said, assuming the XJ and F-Type use the same speakers I suppose it's relevant, but clubairth1 would have a better idea.

 

Hey no problem. I have had that happen to. Something to do with "related threads".
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