My macbook pro retina's right speaker is not playing and sound but my left one is, is that supposed to happen?

This is the first Retina before the new one came out, it's the 13". When I play a video, sound is only coming out of the left side, is that supposed to happen or is both the speakers supposed to work and play at the same time? Thanks

Unless that is the way it was recorded, you should hear from both speakers.
Try going to system preferences/sound, output tab and make sure the balance slider is set to the center.
If still no joy try a pram reset:
Power off, power back on holding the following keys:
OPTION COMMAND P R
Continue to hold these keys till yu hear the start chime 2 times , then release, reboot.
If still no joy and your machine is less than 1 year (an addtional 2 years if you purchased AppleCare) bring it in for a diagnosis, you are still under warranty, andthey should repair it as long it is not due to accidental damage, or liquid damage.
If you are ot of warranty, you can still bring it in, and the disgnosis will will be free, they will then give you your options.
Hope this helps

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Back up all data before proceeding.
This procedure will unlock all your user files (not system files) and reset their ownership, permissions, and access controls to the default. If you've intentionally set special values for those attributes on any of your files, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. Do so only after verifying that those settings didn't cause the problem. If none of this is meaningful to you, you don't need to worry about it, but you do need to follow the instructions below.
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The command may take several minutes to run, depending on how many files you have. Wait for a new line ending in a dollar sign ($) to appear, then quit Terminal.
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Take this step only if you have trouble with Step 1, if you prefer not to take it, or if it doesn't solve the problem.
Start up in Recovery mode. When the OS X Utilities screen appears, select
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My macbook pro retina's right speaker is not playing and sound but my left one is, is that supposed to happen?

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