So I picked up a Mesa 1516 cab today for $325. I'm looking for something to replace my Ampeg 8x10. The 1516 has certainly been used and I think the 10" speaker doesn't work...it seems to be "frozen" since it doesn't push in at all like the 6's and 15. Where can I get a replacement for this at a good price besides Mesa? Is it worth keeping this thing if it's cosmetically pretty beat, and 1 speaker doesn't work? The tone is absolutely amazing even without the 10" working properly compared to my Ampeg 8x10. Also, I'm mono-bridging my SVT-4 into this...but i'd like to add a 2x10 or 4x10 mesa cab, how would I go about that? I don't want just as much power going to the 2x10 as this beast.