components behaving sporadic

I've been having a problem with my front component system. I initially noticed the problem a few months ago when the front right component speaker (tweeter) began distorting at above half volume. I thought it was my crossovers so I fiddled with them and they eventually stopped. The problem came back a few days ago when I was tuning my system. The same right side began to distort again and I fiddled with the cross over again -> did not work. Then the left side woofer went out and only the tweeter was playing. I fiddled around a bit again and the right side that was distorting stopped but the left side woofer still does not work. I opened the crossover casing and looked for any signs of burnt parts but everything seemed fine to me. My set up was pieced together.. so here goes: The crossovers for the components are MTX Thunder Series The front component woofer are pioneer (I cant remember the model number) The front component tweeter is MTX The amp is a JBL GTO 755.6 HU is Pioneer DEH-P6800MP If the sub and rear deck speakers matter I'll list them if needed. Everything is in a 98 neon

By fiddling around I meant that I adjusted the wires (incase anything got lose) as well as giving the crossover a tap to see if caveman methods work. If i remember correctly, none of it worked. It came on for itself. The reason for the mix and match is because I was on a tight budget (and still is:( ) so I had to make due with what I had.