Hi,
A quote from the Volvo C70 sales folder Austria - translated in English (to
the best of my knowledge 
):
"Premium Loudspeaker System ... in cooperation with the Danish loudspeaker
manufacturer Dynaudio specially made for the C70...With the C70 cabriolet
you can install additionally two subwoofers behind the rear seat rests..."
Their is a picture of a speaker stating "9" Subwoofer (Volvo C70 cabriolet".
Intention to add these was the reason for my original posting.
Wytze
So, I gues its only for the convertable.
