there is a amp and sub in the back right cargo area. on the lwb and county's swb they had a 6 disc changer in the rightside lower cargo area. just pull the cover off the rightside of cargo area. the other side has the spare tire/jack etc. the speakers could be blown. if there factory that is a good long time for them. my front speakers rattle so i just unplugged them intell i have some $$$ to get new ones. i still have the tweeters in the front that work good.
http://www.rangerovers.net/modelspecs/1993.html
i have linked this before in another thread or 2 but this has some good specs on RR's