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Topic: no sound out from ims3000 to cp750 source from apple tv
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Leo Enticknap
Film God
![](http://www.film-tech.com/ubbmembers/534a.jpg)
Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000
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posted 04-03-2019 09:13 AM
The most likely explanation seems to me that you need to make up a DAD file that routes the alternative content channels correctly.
The problem clearly is not that the IMS3000 cannot decode the HDMI audio, because you are seeing its signal on the IMS's VU meter display. That also rules out an EDID or HDCP issue. It also isn't your RJ45 to DP25 adapter, because you're hearing the DCP sound in the auditorium (presumably with the right channels in the right places).
I have got HDMI audio working OK on an IMS3000 on at least two installs that I can recall, but both were Atmos installs, with a full DAD file being worked up for them.
My guess is that the AES outputs from the IMS have the regular DCP channels routed to them by default (i.e. what will happens if you don't upload a DAD file into it at all), but not the HDMI channels, and that you need to "hard route" these channels in a DAD configuration. However, the last time I set up a 3000 from scratch for alternative content playback was last September, so this guess comes with no guarantees!
However, one potential gotcha is that the IMS3000's HDMI input can deal with LPCM and Dolby-encoded audio only - no DTS. So your alternative content sources should be forced to LPCM and/or Dolby output (not bitstream). If they start to output DTS for any reason, your VU meters will go blank and there will be no sound. But, to reiterate, that doesn't appear to be the problem in this case, because you write that you can see the input signal on the web UI.
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