No idea, but for the money you are better off just going aftermarket. you can buy cheap amps and speakers that are still significantly better than stock.
OK, what I am trying to do here is get a little better performance out of the stock stereo setup because I'm not spending my $ on a complete aftermarket stereo when other performance, mechanical, and aesthetic things are on my list first. Music is secondary to me right now.
I know aftermarket is always better than stock. I'm not buying aftermarket components for the time being and I never buy cheap anything for my cars. Cheap speakers, amps, and head units are never worth it. I'd rather suffer with the atrocious stock stereo than buy subpar stereo equipment.
If anyone out there knows what exactly makes up the Shaker 500 please chime in.