Felston digital audio delays can be used to delay stereo analog inputs by placing an "analog to digital converter" (A/D Converter or ADC) between the analog stereo source and one of its digital inputs. You simply connect your right and left stereo audio outputs to the A/D Converter where they are transformed into a digital (S/PDIF) audio signal for input to the digital delay. You would still need an AV Receiver or amplified speaker system with digital audio input unless your display accepts s/pdif digital audio.

Possible variations in the diagram above: It shows the digital audio source (such as a DVD player) using the optical input and the analog source using coax but it would work the same if the reverse were true since the A/D Converter has both optical and coax outputs. The delay units can also output both channel A and B on one output in which case there would be only one cable (either coax or optical) from the delay unit to your AV Receiver.

For users with analog sources, A/D Converters are available from many companies and normally cost about $75.  Many are internally identical to the private labeled version Radio Shack formerly sold for $39.99.

Their part number, if any are still available, is 15-1242 so if you have analog inputs call your local Radio Shack stores to see if they still have any available. We bought 500 of them when we learned they were bing discontinued and still have some if you can't find them at Radio Shack.

Keep in mind you will only need an A to D Converter if you need to delay analog outputs which can be recognized as R (right) and L (left) stereo normally on Red and White color-coded RCA type connectors.

If you can't find one at Radio  Shack we still have them for $29.99 plus $8 shipping: CLICK HERE

Also, remember that you "still need" an AV receiver which will accept "digital audio" (if it says Dolby Digital^® or DTS^® it will) even if you are only interested in delaying analog stereo signals. because the DD740 outputs are digital audio.  An exception is an amplified speaker with s/pdif digital  input (like the Logitech Z5450) which can accept coax or optical digital audio eliminating the need for an a/v receiver since the Dolby Digital^® or DTS^® decoder is built into the speaker system. 

We have seen a few LCD displays that accept digital audio and they should also work fine without an av receiver but that is still rare so be sure the digital audio output of the DD740 is compatible with your speaker system or display if you are not using an av receiver with digital audio input.

Dolby Digital^® or DTS^® are registered trademarks of Dolby Laboratories, Inc. and DTS