lip sync error problem solved, felston digital audio delay

DD340 lip sync error solution plasma lcd
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F.A.Q. & Support

Lip sync plasma lcd solved with Felston DD340

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

Which types of audio signal can the DD340 delay?
Can the DD340 delay DTS?
Does the use of a DD340 reduce sound quality?
I use an optical (TOSLINK) cable for digital audio. Can I still use the DD340?

Which types of audio signal can the DD340 delay?

In order to solve lip sync issues, the DD340 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. This cable can be identified in these ways:

  a) It connects to a single RCA phono socket on the source equipment and amplifier and may be labelled as "Digital Audio", " Digitial Coax", "Digital Coaxial", or "Digital Audio Coaxial"
     
  b) The RCA phono socket on the source and amplifier normally has an orange or black coloured plastic insert (definitely not red or white).
 
IMPORTANT NOTE: The DD340 is not compatible with ANALOG audio signal from a source. Analog audio signal can be identified since they use a pair of leads, connecting to two RCA phono sockets (usually one with a red plastic insert and one white).

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Can the DD340 delay DTS?

Yes. In fact the DD340 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 use of a DD340 reduce sound quality?

Absolutely Not! There is no change at all in the quality of audio when using a DD340, as the audio is being transmitted digitally. The DD340 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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I use an optical (TOSLINK) cable for digital audio. Can I still use the DD340?    

If you are yet to purchase a digital audio delay, conside the DD540 that has optical connections built-in.

However, even if you already own a DD340, you can connect to equipment via optical connections. You will need a simple optical-to-coaxial convertor and/or a coaxial-to-optical convertor. These are available at low price 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, priced at approx US$30 (approx 20 GB pounds).

 
coax to optical converter

Most AV amps have both optical and coax sockets for digital audio. If that is the case, then option 1 below is ideal for you.

Options 2 and 3 show alternative configurations that allow connection to an amplifier via its optical audio socket, or to both a source and amplifier via their optical audio sockets. All these options are easy to set up and perfectly suitable for use with the DD340.

   
 
Option 1: Connect to the coaxial digital audio output of your source (DVD player / set-top box) and the optical digital audio input of your amplifier
Digital audio delay - 1
 
Option 2: Connect to the optical digital audio output of your source (DVD player / set-top box) and the coaxial digital audio input of your amplifier
Lip sync option 2
 
Option 3: Connect to the optical digital audio output of your source (DVD player / set-top box) and the optical digital audio input of your amplifier

Option 3

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