What's the latest advice on upgrading the stock sound system? I remember lots of talk about doing that in the past.

Some guys over on the S-Type list are asking about doing that and I suggested they surf over here and search the list.
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Jaguar - it's not an automobile, it's a Motorcar
Own: '08 S-Type 4.2
Sold: '06 X-Type 3.0/auto

 

Well I mean it's as simple as a new deck, speakers and amps.

I have 6 infinity 62.11i, 6 1/2 round speakers, and 2 12 in kicker l7 subs. With an amp for each. And a Kenwood deck. It's pretty simple I think. The craziest thing I had to do was use spacer rings for the front door speakers. I used mdf.