our 2000 Mustang Convertible has the Mach460 and the rear drivers side woofer pops occasionally - possible wiring issue? maybe a short?

also - what's the general recommendation on using component speakers in the Mach460 setup?

 

I guess I'm looking for recommendations on the upper speaker in the front doors - as separates would leave an audio gap between the 300Hz lower and whatever a 1" tweeter would support (not nearly that low)

any ideas?