Right, the analog output of your mac is just left/right or a blended version of the 5.1 surround if you're playing a DVD. To get the six separate sound channels out you have to use the digital output of your Mac and run that to the digital input of a home theater receiver. The digital output is actually the same jack but you have to use an optical cable instead of a headphone jack cable. The Mac will sense which kind of cable is plugged in and turn on the optical transmitter in the headphone jack when you plug in the right cable. The end of the cable is called a "Mini TOSLink" or somesuch. On the receiver there will be an optical input that is kind of square. Its the usual one that's been used to connect standalone DVD players to receivers for many years. Once you've got that up and have your receiver set to take input from that optical digital connection it should give you six channel output. Most receivers will have six sets of 'bannana plugs' to hook up six separate speakers although some will just give you five and another plug to hook up a standalone subwoofer. There are some newer ones now that also do wireless connections to powered rear speakers so there isn't so much wire running around.

Anyway, hope that helps you get your Mac all hooked up for sound.

CB

On 4/19/12 6:46 AM, Scott Howell wrote:
That would not be true surround sound. You have to have audio hardware to send the sound 
to separate channels to create the "surround sound" effect.

On Apr 19, 2012, at 12:57 AM, Pam Mathers wrote:

Hi.  Right now I have an audio cable hooked up to the headphone jack of the 
computer and the other end hooked in to the exilary output in my stereo so that 
the sound comes through the stereo speaker.  The stereo only has two speakers 
so if I wanted more of a surround sound, would I beable to buy two extra 
speakers and hook them in to the back of the computer and hear those at the 
same time I'm hearing the stereo ones.  Thanks.

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