Film-Tech Forum ARCHIVE: No Surrounds in SR on DTS Unit

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Posted by Jason Setzer (Member # 3949) on 11-11-2006, 09:40 AM:

We have surrounds in digital just not in SR, any theories? Does it have anything to do with the analog board?

The DTS unit is a 6ad and the analog is a D744

[ 11-13-2006, 03:11 PM: Message edited by: Jason Setzer ]

Posted by Louis Bornwasser (Member # 3063) on 11-11-2006, 09:42 AM:

What model analog processor do you have? Louis

Posted by Chris Trainor (Member # 9) on 11-11-2006, 10:32 AM:

Louis,

the 6AD is a analog/digital processor.

--Chris

Posted by Demetris Thoupis (Member # 833) on 11-11-2006, 10:35 AM:

Have your technician check the A-Chain on the projector. Perhaps you only get 1 channel in instead of both. Do you have sound coming from the front left and right speakers or is it just coming out from the centre or only left or only right?
Demetris

Posted by Jason Setzer (Member # 3949) on 11-11-2006, 10:39 AM:

I added the 6AD after Louis replied. I did an achain on the projector and sound was coming out front left and front right, I also set the slit loss.

Posted by Demetris Thoupis (Member # 833) on 11-11-2006, 10:42 AM:

You mean that you had both left and right channels from your stereo solar cell / Reverse scan reader coming in the DTS6AD unit right?

Posted by Jason Setzer (Member # 3949) on 11-11-2006, 10:43 AM:

Correct , I was also saying that during normal play in SR Screen Left and Screen right speakers are working.

Posted by Demetris Thoupis (Member # 833) on 11-11-2006, 11:02 AM:

One quick test you could do is reverse the L+ with the L- connection (or the R+ with the R-) ONE channel of the two though not both and then the sound that should be coming from screen speakers will leak from the surrounds. If this does not happen then perhaps a board has a problem although I am not fully familiar with the DTS6AD unit. You get sound from the Surrounds when playing on DTS? Do you also have an external DA20 unit which also plays the surrounds? Do you have another DTS6AD unit in your venue with which you could swap the DSP or the analog board? (analog board D744 top and DSP D741 middle). Has this been an issue from installation date or has it just started?
Demetris

Posted by Gordon McLeod (Member # 33) on 11-11-2006, 01:33 PM:

Also the Dolby surround test film comes in very handy for that purepose as does a copy of Jiffy

Posted by Monte L Fullmer (Member # 2797) on 11-11-2006, 01:47 PM:

*gasp* the 6AD units...bet the DSP board (the middle one) is giving you fits..

....swap it out with another 6AD unit and see if the prob travels. In fact you can swap out the two lower boards with another 6AD unit to see if the problem travels..

...if you know how to do SPL settings on the 6AD unit and with a SPL meter, you can chek that out as well...

good luck - Monte

Posted by Jason Setzer (Member # 3949) on 11-12-2006, 12:54 PM:

Ok I tried switching the L- and L+ connection yet still no surronds, also switched analog boards and no surronds. Will try to switch DSP boards in next intermission

Monte would the SPL matter if the surronds are working in digital?

[ 11-12-2006, 02:19 PM: Message edited by: Jason Setzer ]

Posted by Gordon McLeod (Member # 33) on 11-12-2006, 04:24 PM:

I beleive there is a optical surround level trim if memory serves

Posted by Monte L Fullmer (Member # 2797) on 11-12-2006, 08:50 PM:

Hello Jason. Check this manual out on areas to tune in those surrounds and see if what Gord says about optical surrounds, for it's been 4 yrs since I last saw a 6AD unit and since have really forgotten quite a bunch of this processor...

good luck - Monte

Posted by Jason Setzer (Member # 3949) on 11-13-2006, 03:09 PM:

Ok I switched all boards out and still nothing.

The only way I can even get faint surrounds is to turn the trimpots for them all the way up on the Analog board. I couldt find anything to do with optical surround trim

Posted by Jason Setzer (Member # 3949) on 11-13-2006, 05:54 PM:

Ok so it was a couple things, by turning the surround trimpots up and the Analog HF down I was able to get surronds! Thanks everyone for their help