It's been a -long- time since I've thought about QM but iirc the audio side supported 3 discreet channels (left, right, speech) so on 2 wires they have to be doing something somewhat magical either ADDA, tdm or unholy things with phasing (that
seems plasuable in theory but I have doubts about reality and noise issues since at that approach it would be unbalanced.)
I believe the video side is analog -- hince the skew free cable -- but digital audio was far more advanced back then.
Something like the DM-NAX-300 amp that's shipping in June (IIRC) and takes a Dante/AES67 input might be a plausible replacement without impacting cabling. Or if the CresCat is home run and only mono audio needed repurposing the power side of
the CresCat for audio and a headend amp bank may or may not be feasible
(Disclaimer- have not had hands on the NAX anything so tend to be a bit less likely to recommend it unless/until I see it and try breaking it myself)
Lincoln
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I always thought QM was an analog transport, but the specs do talk about DA conversions. The fact that they need low-skew cable (or compensation for skew) suggests analog video, but I'm seeing now that "Audio signals are transmitted digitally with high-performance
24-bit resolution" (Google found that on the?QM-FTMCSC-B) page). Maybe only the audio is digitized, to allow it fit onto the same cable as RGB video? I'd probably look at something like a little RDL amplifier to replace them, given your budget restraints.
On another note, if the cable is CRESCAT-QM-NP, then it's the low-skew variety, and that may give you issues with your HDMI over Cat5e.
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Josh Winn
The LiquidPixel Group
