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Wifi2hifi looks close but it has a 3 sec buffer so is not suitable for videos/movies. 
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I was just looking for something that would utilize hardware that I already had.
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Most everything I watch is through a media center (PC) system. I am a little hard of hearing and need the volume louder than everyone else. <br />
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Are there any iPhone apps out there that would stream all audio coming from my PC to my iPhone, then I could control the volume I want through it?
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Most everything I watch is through a media center (PC) system. I am a little hard of hearing and need the volume louder than everyone else. 

Are there any iPhone apps out there that would stream all audio coming from my PC to my iPhone, then I could control the volume I want through it?

Wifi2hifi looks close but it has a 3 sec buffer so is not suitable for videos/movies. 

I was just looking for something that would utilize hardware that I already had.

A little hard of hearing

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.