Author Topic: Rotel RSP1068 - loud pop noise  (Read 189 times)

Offline monkeybrainz

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Rotel RSP1068 - loud pop noise
« on: June 15, 2018, 05:48:10 PM »
Hi guys. Long time lurker, first time posting ;)

So a couple years ago I purchased a second-hand Rotel RSP1068 from someone on the avforums classifieds. Up until a couple months ago it served faultlessly on general lounge duty.
But then one day while watching a movie, seemingly randomly, it suddenly output a loud "pop" noise across my rear-left speaker (significantly louder than the audio-track). Initially I was rather confused as to the cause (it only occurred once during that movie, and didn't occur again for at least a week) so just put it down to a rogue eskom spike.
But over the next couple weeks, as it had now occurred a couple more times, it got me wondering about some other possibilities...faulty channel? ground loop? weird cable issues??
Long story short, after performing a dizzying array of "trial and error tests", the only thing I managed to ascertain was that the pop would only occur if decoding a DTS stream, pcm was fine; and also the pop wasn't guaranteed to occur, just that it would only rear its head when decoding DTS (entirely randomly, sometimes within 5mins of a movie, other times movie could play on loop all day long before a pop would occur).
While not the end of the world as decoding can simply be done elsewhere in the chain, this is still a rather frustrating issue.  :headbanger:

So this brings me to the reason for this post: have any of you perhaps experienced a similar occurrence to the above? Perhaps with a Rotel RSP1068 too?? I presume this issue is caused by some fault within the DSP chip, or perhaps a dry joint somewhere along the way. Unfortunately I've very limited experience with electronics and thus no clue where to start troubleshooting.
Any advice you could share would be greatly appreciated.
Thanks

Offline windshear

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Re: Rotel RSP1068 - loud pop noise
« Reply #1 on: June 17, 2018, 08:18:51 PM »
Google "DTS Bomb". It may or may not affect your processor. I cant remember the specifics but I recall the manufacturers of various brands released firmware updates to counter it.

Offline monkeybrainz

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Re: Rotel RSP1068 - loud pop noise
« Reply #2 on: July 02, 2018, 10:53:15 AM »
Flip I forgot about this post.
@windshear, thanks very much for the pointer, will have to do some googling this evening.