Speakers intermittent banging noise

on both macbook pro (plugged in to thunderbold) and imac27 - bose speakers plugged in via headphone jack make a huge bang/boom sound every 10 seconds or so.
I cant figure out any reason for this as its the same if im playing music, watching a movie or doing nothing.
the only way to stop it seems to be to unplug the bose and use internal speakers instead
any help appreciated, thanks

Well little did I know that I was in the process of hearing my Belkin F5U307 7 port USB hub screaming its last few cries for help as it has now died. A three year long useful life expended.
I'm unsure what the issue was here. I know that when I had been switching on the Mac that I had occasionally had a loud buzzing from the speakers during startup. A quick disconnect and reconnect sorted it. I had upgraded to the current Mac Pro a few months ago. I reckon its a power supply issue but can't be sure.
So I am now in need of a new 7 port usb hub.

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Well little did I know that I was in the process of hearing my Belkin F5U307 7 port USB hub screaming its last few cries for help as it has now died. A three year long useful life expended.
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Kudos come to those who earn them!
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No extra information has been received about this member's system.
I did find this and decided to share it in case it will help.
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I am not sure you are going to like what I have to say. I had a similar issue with a TX, and after 3 trips to the Geek Squad at BestBuy, it was declared that they had sold me a lemon. The motherboard needed to be replaced. They would make an exchange for me. Well the second one had the same issue, but I didn't even bother returning it. Just to ensure that we have the same issue, it makes no difference what media source the audio comes from, and it sounds like a skipping CD or maybe static that lasts a few seconds and then doesn't come back for a bit. Sorry I don't have better news for you, but that's how it was resolved (or not).

Speakers intermittent banging noise

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