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Teddlington
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PCCM+ MOST box defective?
Teddlington replied to laalves's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)
Maybe this doesn't quite answer your question because a) it's dark outside now, and b) I don't fancy the grief of pulling my HU out to check - but: My CDC-4 lights up when powered but not connected, My Bose amplifier lights up when powered but not connected, my Mr12Volt bluetooth / USB / SD / Line in interface lights up when powered but not connected, and; My PCM2 used to light up when powered but not connected. I would deduce from this (and the light read through the MOST technical specification 🤓) is that the MOST box supplied with the PCCM+ must light up, otherwise it isn't transmitting on the network and will in fact cause the entire network to fail (all signals pass through, and are replicated by, every device on the loop). Check the connection from the HU to the MOST unit is actually connected and seated properly (without sounding too patronising). If that isn't it then there is a setting in one of the hidden menus to turn MOST off, this might cut power to the box, check this isnt switched off too. You'll need to (very) long press "Version Info" to get the menu up. Failing that, give the vendor a nudge and see if they can spot you a replacement MOST unit. I think they have their own part number so I would suspect Porsche can provide the unit by itself. I do get some information in the MOST row of that screen though. I'd have remembered if it was blank. I can't necessarily speak for sound quality over TOSLINK, I just left mine with MOST as it was easy from an integration perspective. Fundamentally it should be fine as it's capable of linear PCM signal and the iphone over USB connection is also I think PCM and generally regarded as pretty much lossless. You do however have an electrical to optical conversion at the HU, then optical-electrical-signal conversion-electrical-optical in your MOST/TOSLINK convertor, then a conversion back from optical to electrical - how good this circuitry is on the HU, MOST to TOSLINK converter, or your amp when it comes to packet loss and jitter could be a bit of an unknown. The only brand name MOST to TOSLINK I could find when I went through the same thought process was an Audison one which was big dollar (how much of that is just Hi-Fi tax, I dont know).