Stereo vs. Mono - mic question

Hi, I have Garageband '08 on a Macbook Pro, and I was wondering why the built-in mic sends output to both speakers in GB's stereo mode? Is the built-in mic a stereo mic? When I use my external NT1-A, stereo mode does the predictable thing and sends audio output to only one speaker.

Macbook Pro, Mac OS X (10.5.5)

Posted on Jan 20, 2009 5:40 PM

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12 replies

Jan 21, 2009 12:09 AM in response to poflynn

Ah, so the built-in mic automatically records on two separate channels...but since the input on both channels is coming from the same mic, the resulting sound isn't really stereo is it? So why include this capability? And especially, why include this capability only for the built-in mic? Does this have anything to do with the fact that the built-in mic is omnidirectional? I am so confused!!!

Jan 21, 2009 7:33 AM in response to Burgundia

Read the Stereo vs Mono link within that page. Stereo is not just sound coming out of both speakers. (Mono comes out of both speakers too). It's two different sounds coming out of two speakers.
You would record, say a guitar and a vocal, both in mono. Then when you mix you can pan one over to the left a bit and one to the right. This gives the stereo effect.

Jan 21, 2009 7:39 AM in response to poflynn

Yes, I understand that, but if you have a mono mic and you record it on two different channels, you don't automatically get stereo sound. That's the part I couldn't understand, but someone else answered and said the mic is a stereo mic.

Also, maybe I'm misunderstanding you, but I believe that simply panning the same mono track left right does not give you stereo sound, because the waveforms, being identical, simply recombine. You would have to fundamentally change one of the waveforms, perhaps by applying some sort of effect or manually changing the equalization.

Jan 21, 2009 10:53 PM in response to WarriorAnt

Thanks! I've actually done that before I just didn't know the result was considered a stereo effect...I just call the result diffuse instead of focused. I usually use it on synth pads & fills to get them out of the way of the main vocals in the center. Occasionally I'll use a 1/64-note offset between two hard left & hard right panned tracks to create a sound that to me sounds more like true stereo.

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Stereo vs. Mono - mic question

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