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Unfortunately there is no definitive way to control the language of the audio track a Spanish TV provider uses. Yes, some TVs are equipped handle SAP which provides a secondary audio channel which would do exactly what you are asking. In the US, the secondary SAP channel is often in Spanish. However, not all programs in the US are broadcast with SAP. So regardless of the capability of the TV, those programs will only be broadcast in the primary language. The same goes true for Spanish programming.
So assume one of the Spanish TV stations has Lord of the Rings on. Obviously it will be dubbed, if they are transmitting the original audio as SAP, you can select that using the TV or possibly the cable box and hear the original audio... but ONLY if the broadcaster is using SAP and English is the SAP. If the SAP is in Portuguese, you're out of luck. There is no TV made that can conjure the original audio track out of thin air if it isn't being broadcast.
Yes, this is the SAP option I was talking about.
Again, it *only* works if the station is broadcasting multiple audio tracks
SAP is short for "Secondary Audio Programming"
It's an *optional* capability that can be used by broadcasters to allow viewers to watch a program in a different language.
The station... and even the program, movie or show.
If the station isn't broadcasting the original audio along with the primary dubbed audio... you won't get the original audio even if the TV is capable of it (which nearly all are now)
The cable box/receiver you use to receive TV with probably has the option built-in as well
Do you know the model of the TV you are referring to? If so I can try to look up a manual for it and get an idea of what the setup process is. Usually the first language you pick when setting a TV up is the language the user interface will be in... it doesn't really have anything to do with what country the TV is used in. But I would have to look at the manual to know for sure.
I don't think you're understanding fully...
If you are looking for a TV to always play English audio... it's not going to happen.
It is up to the channels/broadcasters as to whether it is provided along with the main language they broadcast in.
Okay, if you can get me the model numbers of the TVs I can do my best to make sure they are set up to do what you want, but that doesn't remove the obstacle that not all programs will be broadcast with the alternate language audio.