Dolby Pro Logic and TV

Discussion in 'AV Receivers' started by Walt H, Mar 31, 2003.

  1. Walt H

    Walt H Stunt Coordinator

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    While viewing TV with the Home Theater system turned on (Dolby Pro Logic), should you have the TV's "stereo enhancement" feature on? Example: with JVC TV's it's called "Hyper Surround". Although it sounds good, i.e. it really separates the channels including the rear surronds more, would the TV's surround timing interfere with the Dolby Pro Logic's timing?
     
  2. Philip Hamm

    Philip Hamm Lead Actor

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    There should be an option on the TV to send a line level signal out through the L/R analog outputs. The TV volume should have no effect on the receiver and the receiver volume will be the only one used. That's what should be used, and the TV volume should be all the way down. Using any TV surround modes in this configuration should be irrelevant. If the surround modes from the TV effect the operation of the receiver they shouldn't be used. (same with TV bass, treble, etc.)
     
  3. Walt H

    Walt H Stunt Coordinator

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    Thanks Philip. I'm aware of the "audio out" signal in the TV menu and how it works. I use the TV's volume control because my Yamaha receiver is in a unit that closes with a wood door and the remote control signal does not go through the wood door. As a matter of convenience I use the TV's volume control. I just wanted to know if people thought the two surround signals (TV and Receiver) would somehow interfere with each other.
     
  4. Philip Hamm

    Philip Hamm Lead Actor

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    They will cause all kinds of wacked out behavior.
     
  5. Jack Briggs

    Jack Briggs Executive Producer

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    Walt, you have to decide if, when watching TV, you want to hear the sound through the set's little speakers or if you want the sound routed through your A/V system. One or the other. And to operate the receiver, you have to leave that wooden door open so the remote can interact with the receiver. I'm not sure I understand what you're asking.
     
  6. Scott Merryfield

    Scott Merryfield Executive Producer
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    My old Sony 32-inch TV had a simulated surround sound setting that not only affected the sound from the TV's internal speakers, but also the signal being set via the audio-out jacks on the TV to my receiver. Having this processing enabled on the TV and then also performing Dolby Surround processing on the signal via the receiver caused all sorts of strange audio problems. It did take some time for me to figure out what was happening -- once I disabled the TV's surround sound mode, the surround sound via the receiver was fine. Evidently, the signal was getting processed twice (once within the TV, and then a 2nd time by the receiver). Note that the TV's internal speakers were shut off at all times in my case.

    In short, if you plan on using your receiver to handle TV audio, make sure that all sound processing in the TV itself is disabled. It may have no affect, depending on the model of TV, but it can cause problems.
     
  7. Jack Briggs

    Jack Briggs Executive Producer

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    Wait, is that what's being asked? If enabling the TV's faux "surround" affects the signal going through the set's audio outputs and into the receiver? Hmm. Never tried that before, and never would.
     
  8. Walt H

    Walt H Stunt Coordinator

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    Scott,

    That's exactly what I was trying to say, "double processing" (once by the TV and again by the receiver). In the case of my relatively new 36" JVC TV, the "Hyper Surrond" on the TV does not sound too bad when processed AGAIN through my Yamaha RX-V800 receiver. I do notice some sound mix-up this way, but it not unbearable, IMO. One thing it does that I like is it brings out the rear surrounds more than normal. I only do this on occasion.
     
  9. Scott Merryfield

    Scott Merryfield Executive Producer
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