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Author
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Topic: Strange behaviour from Dolby DMA8Plus.
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Stephen Furley
Film God
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 04-20-2016 05:48 PM
Central (GMT -6:00) (11:48 PM Local)
Marco,
Don't worry, I would always take the fader right down before listening to any unknown signal.
I was projecting this afternoon. We don't normally screen on Wednesdays, but this was a special screening for a local mental health charity of a play they have performed.. Of course, when I was looking for it the problem didn't show up. The DCP for this show had only 2 channel, L and R sound, nothing at all on the other channels. I wonder if the problem only happens when all of the normal channels are in use. I'll have to look at it again when I'm next there on Tuesday morning, setting up next week's films. No, thinking about it the problem happens even when there's nothing playing, so it can't be that.
The mystery signals are much higher than 0 dB; they're right to the top of the histogram on the DMA setup software, which is labelled as +20 dB, so if the software is to be believed they're at least at this level, and possibly even higher, and off the scale.
When there is a proper VI track on a film it is silent most of the time, with quite brief bursts of speech from time to time. This mystery signal is quite different, it's continuously at the same, very high level..
Software version is 1.4.4.1. This isn't origiginal, I upgraded it about two years ago when we re-opened the cinema. I was having problems controlling the DMA from Ethernet at the time, and this upgrade seemed to resolve that issue. No other changes were made at around the time when this present problem started, a couple of months ago.
Hardware revision is 3.
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