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bobtomay

 
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Member Since: Dec 22, 2006
Location: Texas, where else?
Posts: 24,993
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Mac Specs: 15" MBP 2.33 C2D 256 4GB, MBA 13" i7 1.8, MB 2.0 2GB, Nano 4th, 3GS, iPad 1

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First:

You need to determine (for sure, not what someone else told you) the type of port you have on your Mac. You can do this at everymac.com. Select the type of your Mac from the first list, then select your specific Mac from the next list. Once on this page, you'll find all sorts of useful info related to the shipping configuration of your machine.

In the specifications section, Click on the "Ports and Connectivity" tab. The first item in the list is "Video (Monitor):" with the video port on your Mac listed.

example:




If you also see this note:



then you can skip the second part and go on down to the section on "Your Mac supports audio via MDP"

If you do not see that "Details" note, then your Mac does not support audio out through the mdp port. You will need to go to the "Second" section.

Second:

Where do you want the sound? This is an issue because HDMI carries both audio and video and many TVs are expecting the audio to be carried via the HDMI cable. Currently, only the late 2009 iMac and the mid 2010 MBP models forward carry audio through their mini displayport.

If you plan on running the sound to an A/V receiver - you can start looking for a video adapter/cable.

If you plan on the sound coming from the TV, you have a little more work to do. It's time to open up the Owner's Manual for your TV. Once you have it in hand, you're looking for the "Connections" section. Specifically, you're looking for what almost all manuals will show as connecting DVI to HDMI. Typically, you'll find it in the diagrams.

example:




Some HDTVs will not allow for a separate audio connection with their HDMI ports, particularly during the first two years after the introduction of HDTVs. Some have only one HDMI port that will accept a separate audio connection and some will allow you to use any HDMI port. Some of them will have a little note tucked away that their HDMI may not work with a computer.

The diagram will show you which HDMI port(s) may be used along with the type of audio cable required and where it must be plugged in.

The note in Red above - many of the TVs that allow you to use "any" HDMI port have an audio setting that will need to be changed - from Digital to Analog for the port you're using with your Mac. (Panasonic is one.)

On those HDTVs that do have a separate audio input with HDMI, you will need to verify which audio cable will be required. Most of them use the old standard RCA jacks, while some (notably Samsung uses a stereo mini-plug).

If Your Mac supports audio via MDP

There are a great many mini-displayport to HDMI adapters on the market that do not carry the audio portion of the signal. Please see the following section for a list of the adapters that will carry audio.
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