would it be possible to wire 2-channels from a head unit to one speaker, so that in essence the head unit would be "bridged." If so, is this smart, b/c i might drive two speakers like this from my head unit and use a 2-channel amp for my other more powerful components
If you're not overly rich, MA Audio makes a 4 channel amp that's good for the money. Here's the model to try, HK597. It's got pleny of power in reserve for the future. If money is no object, then try Kicker/Rockford/JL/US AMP 4 channel models. I've already upgraded my system and trust me, it sounds 10x better than the HU.