WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Rear Loudspeaker Switch
Courtesy of VOLVO CARS OF NORTH AMERICA.
Carefully lift the rear edge of the center console.
Insert one hand through the ashtray or under the center console.