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Hello everyone, I am totally new to the technical aspect of speakers and other audio equipment so bear with me. I have just recently inherited a pair of Heresy II speakers on risers as well as a Denon PMA-737 receiver. I absolutely love the set up and want to keep it for good. So here's the issue: At first everything worked fine and then in one of the speakers the mids/lows started to crackle even at low volumes. It got bad enough that I just unplugged one and used the remaining good speaker. The same thing started to happen to the second one but didn't get that bad until one day there was a quiet pop and all of a sudden the only signal coming out of the good speaker was extremely faint and heavily distorted/crackly. At first I though maybe there was a problem with the signal coming from the receiver, but I plugged my headphones in directly and there was no problem that I could tell; granted I don't know how to do any tests on a receiver. I would prefer to learn how to do this myself but I am also willing to take it to a pro if necessary. So what are some tests I could perform or potential fixes to this? What tools or other materials would I need? Layman's terms are appreciated! I don't even know how to open them up to have a look inside to take pictures for you all so help there would be appreciated as well. I would greatly appreciate any help. Apologies if I overlooked a thread already answering some of this. If no one has the time to discuss in detail, links to helpful resources are an appreciated substitute. Thank you!