Hmmm,

I did as you all instructed. I cleaned out the headphone jack - and it seems to be working along with the PA outputs.

Without changing the wires however, I realized that the problem is not with the speaker, as the right hand tweeter - which is not connected to the woofer - is also not working.

Roel, what do you mean that the problem would therefore be with the amp of fuse. Is there any way for me to check or change the fuse?

Thanks!
Chony