lip sync error problem solved, felston digital audio delay

DD540 digital audio delay
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DD540 brochure Click here for the DD540 brochure
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F.A.Q. & Support

Lip sync fix - DD540 digital audio delay

Please contact your dealer or our if none of the information below, or in your owner's manual, answers your question.

Which types of audio signal can the DD540 delay?
Can the DD540 delay DTS?
Does the DD540 reduce sound quality?

Can I use the DD540 with an analog (stereo) source?
How can I connect more than 2 digital audio sources?
How do I use a learning remote control with the DD540?

What is the longest cable I can use with the DD540?

Which types of audio signal can the DD540 delay?

In order to solve lip sync issues, the DD540 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 DD540 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 DD540 via an adaptor.

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Can the DD540 delay DTS?

Yes. In fact the DD540 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 DD540 reduce sound quality?

Absolutely Not. There is no change at all in the quality of audio when using a DD540, as the audio is being transmitted digitally. The DD540 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 DD540 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 DD540. Such a converter costs about US$40 (25GBP) or less depending on your location. Please contact for details of where you may buy one.

Please note, the output from the DD540 is still digital audio, and so you will still need an AV amplifier with a digital audio input.

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How can I connect more than 2 digital audio sources?

If you need to connect more than 2 digital sources, or if both your sources only provide optical (toslink) outputs, third-party adapters are available.

For example, if both your sources are optical, then a simple optical-to-coax converter is needed. 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). Please contact for more information.

 
coax to optical converter


If you have 3 digital audio sources
then a powered digital audio switch may be used.

AVOID the use of toslink switches and splitters that do not have their own power - unpowered ones can degrade the signal levels reaching the DD540 and may not work at all, or may cause occassional dropouts in sound.

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 either of the DD540's inputs, leaving the other input available for a third source, coax or optical. 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). Please contact for more information.

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How do I use a learning remote control with the DD540?

The DD540 includes features to allow extensive control by learning remotes. Click here for more information.

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What is the longest cable I can use with the DD540?

We recommend that, for best results, all cables (coax and optical) are kept to the shortest lengths practical. It is not possible to say exactly what the maximum length of cable is that may be used, since that will depend on the quality and condition of the cable and also on the equipment at the other end. However, as a guide a maximum length of 5 metres (15 feet) is advisable for any cable connected to the DD540.

In particular, we recommend that the DD540 is positioned near to your A/V amplifier and connected to it using short cables.

Problems that may occur if a cable is too long are audio drop outs (occassional short periods of silence) or loss of audio altogether.

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