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Re: Speaker Audio when Headphone connected?
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Re: Speaker Audio when Headphone connected?


  • Subject: Re: Speaker Audio when Headphone connected?
  • From: Brian Willoughby <email@hidden>
  • Date: Fri, 22 Feb 2008 19:46:11 -0800

Hi Jeff,

It must be a matter of language, because what you seem to be trying to communicate, and the words you're actually writing, are not entirely in accord.

Observation alone is enough to confirm that Apple's boot code is able to direct the single audio signal to the built-in speakers, even when headphones are plugged in. Apparently, users and developers want to do the same thing at other times after startup. If Apple has no plans to publicly support any access to this internal feature, then you're saying something quite different, and nobody could argue with that theoretical position.

"Mutually exclusive" means nothing more than that you cannot have both audio outputs operating at the same time. This is a well- understood fact that is written in stone (or etched in silicon, as it were). The method for choosing between these two mutually exclusive options is completely independent of the fact that only one can operate at a time. There is no semantic, logical, or hardware design correlation between the two statements.

Brian Willoughby
Sound Consulting


On Feb 22, 2008, at 19:15, Jeff Moore wrote:
The speakers and the headphones are mutually exclusive. Whether this is because of hard wiring or flipping bits in a register somewhere really doesn't matter. This is just another one of the facts about the hardware you have to deal with. There's no secret back door to make it work different.

If you don't want the sound coming out of the headphones, just unplug them.

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  • Follow-Ups:
    • Re: Speaker Audio when Headphone connected?
      • From: Jeff Moore <email@hidden>
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References: 
 >Speaker Audio when Headphone connected? (From: "Paul Haddad" <email@hidden>)
 >Re: Speaker Audio when Headphone connected? (From: Jeff Moore <email@hidden>)
 >Re: Speaker Audio when Headphone connected? (From: "Paul Haddad" <email@hidden>)
 >Re: Speaker Audio when Headphone connected? (From: Jeff Moore <email@hidden>)
 >Re: Speaker Audio when Headphone connected? (From: Brian Willoughby <email@hidden>)
 >Re: Speaker Audio when Headphone connected? (From: Jeff Moore <email@hidden>)

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