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if none of the information below, or in your owner's manual, answers your question.
Which types of audio signal can the DD740 delay?
Can the DD740 delay DTS?
Does the DD740 reduce sound quality?
Can I use the DD740 with an analog (stereo) source?
How can I connect more than 4 digital audio sources?
How do I use a learning remote control with the DD740?
What is the longest cable I can use with the DD740?
Which types of audio signal can the DD740 delay?
In order to solve lip sync issues, the DD740 delays digital audio signals passing between your source equipment (e.g. DVD player, set-top box) and your home theater amplifier via a DIGITAL AUDIO CABLE. Digital audio cable is either optical (toslink) or a coax cable fitted with a single RCA phono socket at each end.
| NOTE: The DD740 is not directly compatible with ANALOG (stereo) audio signals. Analog audio signals use a pair of leads that connect to two RCA phono sockets (usually one with a red plastic insert and one white). However, if you use a home theater amplifier then analog sources can be used with the DD740 via an adaptor. |
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Can the DD740 delay DTS?
Yes. In fact the DD740 can delay any digital audio DVD format that is used today, i.e. Dolby Digital, DTS, Dolby Digital EX, DTS 96/24, PCM, etc.
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Does the DD740 reduce sound quality?
Absolutely Not. There is no change at all in the quality of audio when using a DD740, as the audio is being transmitted digitally. The DD740 simply stores the digital bits coming in and then outputs them, unchanged, after the delay period. Since the data is digital, a perfect copy is made with absolutely no deterioration in sound quality.
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Can I use the DD740 with an analog (stereo) source?
Yes! All that is needed is a low cost, third-party analog-to-digital converter. This simply connects betwen the analog audio source and the DD740. Such a converter costs about US$40 (25GBP) or less depending on your location.
Please note, the output from the DD740 is still digital audio, and so you will still need an AV amplifier with a digital audio input or a speaker system that accepts s/pdif digital audio input.
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| How can I connect more than 4 digital audio sources? |
If you need to connect more than 4 digital sources, or for example have 3 sources that each require optical connections, then third-party adapters are available.
For instance, to connect an optical (toslink) source to a coax input of the DD740, a simple optical-to-coax converter may be used. These are available at low prices both from online stores and at audio accessory shops in the high street. For example the unit shown on the right. It is widely available from audio accessory retaillers, priced at approx US$30 (approx 20 GB pounds). |
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Alternatively, a powered digital audio switch may be used.
AVOID the use of mechanical toslink switches and splitters since they can reduce light levels and degrade the digital audio signals reaching the DD740 and may cause occassional dropouts in sound or not work at all. Toslink switches that do not require external power are definitely “mechanical” but remote controlled powered switches may also be mechanical internally. Powered switches that offer coax to Toslink and/or Toslink to coax conversion will not be mechanical and should work fine.
A suitable powered digital audio switch is the Midiman CO2, for example. It will connect to two digital sources, one coax and one optical. The CO2's output connects to any of the DD740's inputs, leaving the other three inputs available for a total of 5 sources. When the time comes to use one of the inputs connected via the CO2, simply move its switch to the source required.
The Midiman CO2 is available from many audio accessory retailers for approx US$60 (30GBP). |
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