The Older JBL system was best and was last used in 98 Continental.
Back then when I first got hands on a 2001, it had the Alpine setup. But I thought the Bass was terrible and distorted with anything thrown at it. But Really, the 2 Rear sub-Woofers under the rear deck are really AUDIOPHILE. They are not Alpine woofers. Only the doors are Alpine speakers or I think they are since I've never took off door panels to find out. Those audiophiles looked like those Cheap OVAL Walmart Durabrand Speakers, The cone was smaller and the magnet was tiny.
I still had my 98 Continental with the JBL System which was much better & were much less prone to distort. 1998 Had Real JBL WOOFERS.
JBL's woofer had a bigger surrounding cone and Magnet. They also had longer travel which also explained for the better bass response.
I wasn't going to spend money so I swapped the woofers from my 98 to my 2001 and vice versa. What I difference and It felt like home again.