What is the size of the regular Pioneer sound system's sub? I believe the system is 210 watts. The 1st owner of my 1992 SC300 (Im the 2nd owner) got a 280 watt Pioneer Premium Sound System Upgrade w/ 10" sub. Its not the 280 watt Nakamichi system though. I was wonder if the 210 watt stock Pioneer system only had an 8" sub or what.