Felston DD740 Lip-Sync Corrector (Delays Digital Audio via Remote Control)

Description

Oddly eBay does not give us our customer's address for purchases using their International Shipping Program so if you need a UK or Euro 230 volt power supply please send us a note specifying which supply you will need for your DD740. In the past we have been able to determine our customer's location through PayPal but eBay is saying that will change in a few days. WE "HOPE: NOT!
Now guaranteed to solve your lip-sync problem or we will refund 100% upon return!
"If" you "try" the following to determine if an audio delay will solve your lip-sync  problem and it is too close to be sure we will allow return of your DD740 for a full refund if it does not solve your lip-sync problem..  When we first introduced our DD340 (and later DD540 and DD740) we could guarantee our audio delays "would" solve the lip-sync problem but today audio  can arrive "already" delayed. When that happens there is  NO product that will delay 4K or 8K video and correct lip-sync. But it "seldom" happens so we are making this offer to insure the DD740 will either work for you and solve your lip-sync problem or you can return it for a refund (within 30 days so you will have plenty of time to be sure.)
You "may" be able to be SURE an audio delay will solve your lip-sync problem if you first make sure ALL audio delays offered by your TV or any of your equipment are set to ZERO or OFF.  Then look "carefully"
at the mouths during close up shots of "talking heads". Look especially closely as the mouths "close" and speech stops. If  the speech sounds end "before" you see the mouths close an audio delay is what you need to solve the problem.  Unfortunately today there are broadcasters and some equipment manufacturers who "delay" the audio.  If that is the case you will notice the speech sounds continue "after" the mouths close indicating the sound has already been delayed too much and there is no product to delay 4K or 8K "video" and correct that problem. Luckily that does not occur often but when it does there is nothing on the market which can correct it. (But if it's close it's impossible to tell which way it's off without a product like the DD740 to shift the audio in 1 ms steps BOTH ways until lip-sync is perfect which is why we are offering a refund upon return if it does not solve your lip-sync problem.) Even the most expensive AV Receivers often step in huge increments and you can never get it perfect. The DD740 even has a "fine" mode which allows 1/3 ms steps so even the most sensitive viewers can get it perfect.
For more information on the causes of lip-sync error and how to fix it see
www.LipFix.com
or
www.Felston.com
Note:  I have added our DD740 to my personal eBay account "primarily" so customers in foreign countries can take advantage of eBay's International Shipping Service.  If you are in the US I  think your shipping costs will be less when buying from LipFix.com. Our customers in the UK, for example, have had to pay V.A.T. and duty upon delivery and Parcel Force (UK postal service) has imposed a fee (like 7.5 GBP as I recall) above the VAT and duty. In most cases the International Priority Mail shipping charge and those fees collected upon delivery exceed what you will pay if you use eBay's shipping service.  In addition - and perhaps even more important - it will eliminate the inconvenience of having to be available to pay those fees upon delivery which often results in delay and a trip to collect your shipment. eBay's shipping service pays those fees in advance so there is no hassle upon delivery. LipFix can't do that because we are not VAT registered in the UK or any other country.  In addition, eBay, displays your total costs "before" you purchase.  When buying from our regular website you never know your exact cost until after you've paid the VAT and duty upon delivery.
Digital Audio Lip-Sync Correction
Felston lip-sync correction devices solve lip-sync error by allowing you to delay the digital audio signal to match the delay* in the video signal restoring perfect lip-sync.
The DD740 is inserted in the digital audio path between your video source (STB, DVD, DVR, etc.) and your AV receiver (or sound bar)  as in the diagram above. Since the DD740's "bit-perfect reproduction" does not change the digital audio signal, it is compatible with PCM and all present and future s/pdif
surround sound formats such as Dolby and DTS at both 48 KHz and 96 KHz.
Since there is nothing in the video or audio signal to define when they were ever in sync it is a subjective adjustment and this is where the remote control excels. It remembers the last delay setting used on each input and includes 36 presets where common delays can be stored for instant recall. But most importantly, the + and - buttons allow dynamic
"on-the-fly"
delay adjustments while watching with no image disturbance - an essential feature allowing tweaking for "perfect-sync". These are necessary features for true lip-sync correction and not generally available on even the most expensive AV receivers that claim a lip-sync delay feature.
* Normally lip-sync error is due to video delays in both the arriving signal as well as in the display allowing audio to arrive too soon but when broadcasters over-correct for the video delay the arriving signal might have audio delayed instead of video.
At first thought it might appear the DD740
audio delay
could not correct for "
already delayed audio
in the arriving signal"  but in conjunction with the video delay of your LCD, DLP, or plasma display it actually can - up to the display's video delay. That is, if your display delays video 100 ms your DD740 will correct lip-sync errors from 100 ms audio
lagging
to 580 ms audio
leading. That assumes your TV allows you to turn OFF any audio delay it adds. Samsung and Vizio allow setting audio delay to zero but Sony, Panasonic, Toshiba, etc. usually don't so in those cases you should route digital audio directly from each source to your DD740 bypassing the TV.
The DD740's output is optical and/or coax digital and therefore compatible with most AV receivers as well as "most" soundbars.  Please note it is NOT analog so if you need an analog stereo output you will need a digital to analog converter (DAC). We offer an excellent one on eBay:
https://www.ebay.com/itm/15-1242-Stereo-Analog-Digital-Converter-A-to-D-New-as-low-as-9-95/124485550427
Note: The first photo of a poster we used at our INFOCOMM booth shows our DD540 which has two inputs.  Our DD740 not only has 4 inputs but features direct numeric input of delay values as well as a fine mode which adjusts in 1/3 ms increments.