But what happens with digital -- or even mag for that matter, where the surround channel are descrete? Logic would dictate that there would then be no need for the delay, except for really large theatres where you need delay just so that the surround audio doesn't arrive at the ear significantly later than the front sound, otherwise you wind up with an echo. I have Eventide delays for the two surround channels with two outputs, one for the orchestra and one for the balcony. Both are set first to make the surround sound arrive at the same time as the front sound, in each of the two distances. Then when aligning the CP50, the Eventides are used to increase the delay for the needed additional lag value from the arrival time of the front channels (as per standard Dolby setup). In this setup the CP is not used to set the delay. So, With DTS, do the settings for the surrounds have to be changed so the delay units DON'T add lag between the front and rear, i.e., the surrounds should be timed so that sounds from the rear arrive at the same time as the front sounds at the mean test point?

Does DTS, Dolby (re: SRD) and/or Sony discuss the need (or not) for delay in the surround channels?

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You mean the DTS itself has a delay or relies on the delay of the CP-whatever.

John

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The DA20 has adjustable digital surround delay and the setup procedure is described on page 4.3 of the installation manual. With CP500 and 650 there are separate adjustments for optical and digital surround delay although the 650 can automatically calculate the digital delay from the analog setting.

DTS has an in-built fixed delay of 50mS (which as Karen has stated is on the discs, not in the player). If you have a big theatre and need more, then with most analog processors you have to add it externally.

SDDS DFP-D3000 uses the same setting for both optical and digital surround delay.