Best way to find a short

I’ve posted here before about my fathers endeavor to setup his “home theater” in his living room and its been increadibly helpful with guiding him on what to do to get what he wants.

tl;dr - Does anyone have an easy way to try and identify a short in a speaker?

Recently, he’s upgraded his receiver from a 5.1 to a 7.2 receiver. He has a center, two bookshelfs for the left and right, a wireless subwoofer, and then 4 built in speakers that came with the house.

When he just had the 5 channel receiver he was hooking the 4 speakers built into the house together for his rear left and right channels, now that he has a 7.2 receiver he has them all separated out to their individual channels. He’s complained to me that when he is watching movies, he has the volume up so that the dialogue is clear, but then when an explosion happens the receiver shuts off.

I am pretty sure that it’s a short. Same thing happened to me after I moved into a new apartment and one of the banana plugs I made had come just a little bit loose and was causing my receiver to shut off whenver anything in the lower frequency would happen, like an explosions or a that damn Inception sound. (Interstellar was a nightmare to watch before I figured this out).

I have already been over to my Dad’s and have confirmed that all of his speaker connections are tight and snug (they all terminate into banana plugs into the receiver, and the same for the connections into the speakers) and that there are no wires touching each other that would make a short. What I was unable to do though was confirm it with any of his built in speakers. So my opinion is that there might be a loose connection or a bad wire going to one of these speakers (they came with the house, I have no idea what they are or even how old they are).

Does anyone have an easy way to identify a short in a speaker?

Hm you could try to hook the banana plugs up to a multimeter and look at the impedance to see if one speaker that’s build in has a vastly different measurement but if it’s a loose connection somewhere it could be that it’s need more amperage to get it going so it’s only worth a try
Otherwise try hooking them up one by one and see if you get a bad one this way

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Since you checked the amp side of connections.
I would also check the speakers side and cables if its possible.

You could disconnect everything else and leave the 4 build in speakers as they are now.
Then test does it short out.

Multimeter would also tell what is the load behind speaker and is it suitable for the amp.
If they are like old 4ohm speakers and current amp recommends using 8ohm speakers for surround use. That might hit the protection mode.