Was hoping someone would clue me in on something... I've had a rio/empeg for a while, but finally am getting around to selling it. Unfortunately, I really didn't ever get around to installing it or using it much, so my loss I guess

Anyway, I'm trying to do some research to make sure I know what I'm selling, as I am aware there are/were several different models. One thing that seemed a bit odd was that a bunch of the auctions on ebay make it seem like the serial number is important somehow. I followed a link to this and the riocar.org site and so far have only found that it shows the manufacture date of the unit. But people on the for sale board here are asking for the s/n as well...

Is one batch of serial numbers better than another for upgrading or something? Is there something else I'm missing?

Thanks!