Tried posting this in athe Audio/Electronics topic...but no one ever replied in the week since I posted.

The window sticker that came with my '98 S70 GLT says "premium audio system". What exactly is and included with the premium audio system?

 

I think a few extra speakers and the CD players.

 

Has a lot more power also. Some of the differences are listed in the owners manual. The S70 had 3 stereo head options. The top of the line one seems to have several options that the others did not. Also the radio tuning is better, and I'm not sure if they all did but the S70 that we have has the AUTO VOLUME feature. My 850 and 960 has premium systems and they sound a lot better than our S70 system. I think my 850 has 160 watts while the S70 only has 80 watts.

The Head Models Were As Follows:
SC-813 https://www.customers.volvocars.com/..._141.htm#pg142
SC-816 https://www.customers.volvocars.com/..._155.htm#pg155
SC-900 https://www.customers.volvocars.com/..._171.htm#pg171