I almost made this the Meridian Geek 2008 thread because I don't think many people would get the answer, but I didn't... It's a weird one though.
Basically, I have a G68 with 5x DSP33 and a completely kosher 511-based comms set-up (1 master + 5 slaves). On several occasions, one of the 33s would go completely wacko on a non-reproducible basis: Think listening to a 56k modem at high volume.
So I sent the speaker off to M who played with it, soak tested it, and could find nothing wrong with it.
Plugging it back in, it's going wacko on SkyHD, but only on SD channels. [censored]???? Swapping cables makes no difference. Swapping speaker positions makes no difference. Flipping the L/R channel switch makes no difference. This essentially rules out my G68.
So I investigate further. Amazingly, Dolby Digital 5.1 and 2.0 from SkyHD are fine, but stereo PCM triggers the problem *every time*. I now try a CD - stereo PCM - and it is fine! [censored]????
Have you got it yet?
I'm now completely mystified and am wondering if there's something wrong with the comms receiver in the speaker. Could the fault be triggering on one particular source (of the twelve)? So I plug the SkyHD optical into the input usually used by my PS3 and the fault rears its ugly head again. I guess I was clutching at straws...
So now I'm thinking: What is different about DD, SkyHD PCM and CD PCM? And it hits me!
- DD is decoded in the G68, but is not upsampled: 48kHz is output to the speakers.
- CD PCM is upsampled by the G68 and 88.2kHz is output to the speakers.
- SkyHD PCM is upsampled by the G68 and 96kHz is output to the speakers.
My conclusion: My dodgy speaker barfs on 96kHz signals.
Whether or not this is MHR related or not is incidental; when I turn off upsampling in the G68, SkyHD PCM is fine...
So now I have to see how much "new M" is going to charge me to fix it...
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