Ok, I need some on a bass amp tinkering project. I have two older bass amps - one with a single 12" speaker and one with two 10" speakers. I want to see what it would sound like to replace one/the driver with a speaker that had a tweeter coaxial with the main speaker. The only coaxial speakers I have found so far are of the car variety. I know some pro audio companies have made coaxial speakers over the years for compact PA cabs. Any ideas where I can find some of these?