Almarro has poping sound, please help


Recently, my Almarro 318B develop a loud "poop" sound. It is not very frequent. It is intermittent, usually have it after 15 mins or so after it is started. What should I do? I bought the unit used, and I have no history of the unit.
Should I take it to service, or should I try replacing the tube? Is there a way to find out if a tube gone bad? If I am to try replacing the tube, which one should I try first?
gte357s

Showing 1 response by bojack

I had a speaker that had a pooping sound one day. Very concerned, I removed its grill to make sure everything was OK. Sure enough, it had had, well, "an accident" with its woofer shall we say.