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post #1 of 6 Old 11-09-2012, 02:46 AM - Thread Starter
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This is what I have, and the objective is to use DirectTV's remote

Mitsuboshi WD-73734 HDTV (4 x HDMI)
Direct TV DVR (1 x HDMI)
LG BD390 Bluray (1 x HDMI)
Magnovox VHS/DVD recorder (1 x HDMI)
Yamaha RX-Z1 receiver (0 x HDMI)
PIONEER ELITE VSX-49TX (0 x HDMI)

Not sure which AVR I will use but both AV receivers have no HDMI connection. I have connected all input device to the TV's four HDMI connectors. How the questions are:

1. how to make use of my old AVR and get Dolby digital?
2. I am thinking of connecting the AVR to TV via toslink or RCA cable. Will this work? What would I be sacrificing by doing it this way?
3. If I do it this way, would I still be able to use the DirectTV remote to control volume?

Thanks for helping.
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post #2 of 6 Old 11-09-2012, 04:01 AM - Thread Starter
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Oh forgot to mention that I only have speakers for 5.1 setup, no space for 7.1.
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post #3 of 6 Old 11-09-2012, 04:48 AM
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Quote:
Originally Posted by toffee View Post

This is what I have, and the objective is to use DirectTV's remote

Mitsuboshi WD-73734 HDTV (4 x HDMI)
Direct TV DVR (1 x HDMI)
LG BD390 Bluray (1 x HDMI)
Magnovox VHS/DVD recorder (1 x HDMI)
Yamaha RX-Z1 receiver (0 x HDMI)
PIONEER ELITE VSX-49TX (0 x HDMI)

Not sure which AVR I will use but both AV receivers have no HDMI connection. I have connected all input device to the TV's four HDMI connectors. How the questions are:

1. how to make use of my old AVR and get Dolby digital?
2. I am thinking of connecting the AVR to TV via toslink or RCA cable. Will this work? What would I be sacrificing by doing it this way?
3. If I do it this way, would I still be able to use the DirectTV remote to control volume?

Under the conditions, the most obvious approaches are to either get a new receiver that has HDMI inputs, or use some other device as your HDMI input selector. The likely candidate for the second approach is the TV.

Now, what does the Mitsubishi WD-73734 user's manual say about the formats it passes through?

Since you are posting on the web, I presume that:

(1) You have web access
(2) You know how to read the Mitsubishi WD-73734 user's manual online if you don't still have the paper copy that came with the TV.
(3) you can read.

Don't let me stand in your way! ;-)

Just to encourage you a little, the answer is on pages 10, 23, 54 and 58.
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post #4 of 6 Old 11-09-2012, 08:36 AM - Thread Starter
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wow, you read thru the whole manual to come up with the page numbers? That's impressive!

On page 58, under input HDMI:
Quote:
EIA-861D standard for digital audio and video via HDMI
HDMI standard connector
Video: 60 Hz: 480i, 480p, 720p, 1080i
24 Hz, 30 Hz, 60 Hz: 1080p
Audio: PCM stereo
under digital audio output:
Quote:
RCA Pin Plug,
Signal Type Dolby Digital, PCM stereo

Does it mean that it only input stereo but output them as Dolby Digital? What if a Blu-ray movie comes with TrueHD audio? So by the time it was route thru my TV, the output to AVR would only by stereo or Dolby Digital?
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post #5 of 6 Old 11-12-2012, 04:57 PM
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Quote:
Originally Posted by toffee View Post

Does it mean that it only input stereo but output them as Dolby Digital? What if a Blu-ray movie comes with TrueHD audio? So by the time it was route thru my TV, the output to AVR would only by stereo or Dolby Digital?

It depends. Usually, the digital ports are wired as audio passthroughs, so, no, it won't do the DD to PCM conversion, just pass the signal.

Your manual says, on page 18, "Digital Surround Sound: The TV’s HDMI inputs can receive digital stereo audio signals only. To hear digital surround sound from an HDMI device, connect the device’s digital audio output directly to your A/V receiver. See the Owner’s Guides for those devices for instructions." Which makes me think it might not.

Still, I'd be surprised if it doesn't pass DD signals through. Worst case, you're only out the cost of a coaxial digital cable to try it out.
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post #6 of 6 Old 11-12-2012, 05:27 PM
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Quote:
Originally Posted by toffee View Post

wow, you read thru the whole manual to come up with the page numbers? That's impressive!
On page 58, under input HDMI:
under digital audio output:
Does it mean that it only input stereo but output them as Dolby Digital? What if a Blu-ray movie comes with TrueHD audio? So by the time it was route thru my TV, the output to AVR would only by stereo or Dolby Digital?

The vast majority of TVs, only having two speakers, can only handle stereo inputs, mostly. Only HDMI can transfer TrueHD. Under HDMI protocol something called a "handshake" occurs when two devices are connected via HDMI. The TV would tell the disc player that the TV has to receive stereo so the disc player would automatically send stereo to the TV. The TV of course could not magically create multichannel output from the stereo input, so what passes through to the receiver will be stereo.

Toslink (optical or coaxial digital connection) can transfer normal multichannel (ie lossy) dolby or DTS multichannel. Over the air broadcasts use dolby, and AFAIK essentially every TV with a digital output will pass multichannel dolby on to the receiver if you are using an antenna and over the air broadcast, so you get multichannel through the digital connection when you use the TV's internal tuner to receive over the air program. Now we get to where things are a little less clear to me. AFAIK, however, most TVs can handle multichannel dolby only when it comes over the antenna, not if it's coming through an optical or coaxial digital connection from a disc player. What that would mean is if you connect your disc player via coax or optical and set the disc player to output multichannel (might have to be dolby, TV may not be able to understand DTS at all) you'd get silence from the TV's speakers because the TV cannot recognize/understand/decode multichannel dolby. Whether theTV would pass the multichannel dolby through it's coax or optical output I do not know. But here's the thing. I absolutely guarantee you that the sun won't go nova, and your equipment won't be damaged if you connect via optical or coax digital and send a multichannel dolby track to the TV and the TV can't either use that data itself or pass it along. You'll get silence. Then you will know you have to set the disc player to output digital stereo to get the system to work when connected that way.

It's commoly stated around here that blu rays use a higher bitrate lossy encoding than is typical for DVDs, and that the sonic differences between the high bitrate lossy track and a lossless track is essentially inaudible. Assuming that to be the case, your best bet is to connect the player to the receiver digitallyvia coax or optical so that multichannel sound can be passed to the receiver.
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