C70 premium sound system - how do I know?

[Squirtydog]

Dear all,

I am considering a C70 (around 2006 based on budget) T5. I really want the works when it comes to the audio system as I have been impressed with the high end Volvo systems in the past (my last C70 T5 GT)... and far less than impressed with the bog standard in our new XC60.

Obviously I'll check with any seller what system is in before I go travelling to view, but is there an easy way to tell based on the pics? Not all descriptions give all the detail.
I had assumed that if I see a center speaker then I'm looking at a pro-logic system and therefore premium, but there is one here which has the center speaker but states 8 speakers and 'high performance'.

Apologies if I have answered my own question.