External amplifier
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2004 Porsche Boxster, 2003 Porsche Boxster, 2002 Porsche Boxster, 2001 Porsche Boxster, and 2000 Porsche Boxster. However, it is still accessible from the selected car via links, so may be relevant.
An external amplifier (Harman or BOSE) is available as an option and is linked to the PCM2/CDR23 via the optical waveguide.