Regarding setup and how it sounds...
As previously mentioned, the SC-901 was one I purchased from an enthusiast locally and had been tested. So, no issues with the code here. I did, however, take the time to polish the display with NOVUS three-step plastic polish because the scratches would have driven me nuts. It worked very well and would recommend.
Before clean & polish...
I actually spent more time polishing it after this photo, but this is after a basic clean & polish...
The Dolby processor I removed from the R at the junk yard replaced my missing one. The Volvo amp that was under my passenger seat still works great. The existing harness behind the stereo was complete, but cut and spliced just as expected. I replaced what I could with uncut wires from the junk yard, but there was one section (the yellow/black wire) that I needed to fix with a replacement male/female connectors in each side of the plug. The center speaker wires were cut and spliced to new wires but not actually hooked up to anything, so I used the complete junk yard wires for that too.
Once everything was hooked up, I had no issues -- center speaker works, the different sound modes, CD and tape players, everything worked great. I didn’t have time to get the levels adjusted beyond basic levels, but the sample CD’s I put in to check the functions sounded fantastic. And, that’s excellent news for me, because I still rawk out with those instead streaming or downloads. Once I have a little more time with it installed, I can post a more specific review of the sound but I’m pretty optimistic already. That said, I am missing the sub in the back already. In a perfect world, I’d like to figure out how to wire it back in. Any of you audio people have suggestions? I’m guessing it needs it’s own amp to power it.