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5.1 dolby digital surround sound from imac

post #1 of 9
Thread Starter 
How do I get 5.1 dolby digital surround sound from imac?
 
Hi everyone, I am very very new to this forum so if I do something inappropriate, I apologize for that. =)
 
Here are my questions.
I have got a mid 2007 iMac and a Creative inspire p7800 7.1 speaker.
What I want to do is to hear 5.1 dolby digital surround sound from the creative speaker (which does not support DD and DTS like Logitech z5500 and Logitech Z906 do).
I have done tons of research and spend a lots of time in the internet to look for answers. I did find some solution on this issue but I am not 100% sure. And some more questions pop up. So I am hoping that some expert here can clear my mind. Thank you so much ^^
 
So, here is some solution that I got from the internet. (please correct me if I am wrong)
 
1. Buy a Griffin Firewave and connect it to my mac and thats all I need to do. As Griffin Firewave has dolby digital processor, so I think I will be getting 5.1 DD surround sound from the speaker. (Am I right?)
But the problem is, there is only one firewave listed on amazon and one listed on ebay. The amazon one is really really expensive that I think it is really unreasonable to buy it. So as I may not able to get a Griffin Firewave, this lead to my second solution.
 
2. Buy a external sound card like this:
and connect it to the mac. But my question is, As I do not have any Dolby decoding device connected, will I getting 5.1 DD surround sound in my speaker? Or the program in my mac (i.e: VLC) already done the decoding and output as 5.1 multichannel analog so I don't need a extra decoding device?
 
3. As I am not sure about those method on the above will get 5.1 DD surround sound in my speaker, I keep digging and find out there is actually one more option.
Since the iMac supports s/pdif output, what I need is to buy a Digital to Analog converter(DAC) and use the mini Toslink to connect my mac with the DAC. Then connect my speaker to the DAC. Some DAC I found:
and most of DAC support DD/DTS decoding, I should be able to get 5.1 DD surround sound at the end. Is it correct?
 
My question is, is this the right solution to get 5.1 Dolby?
If Griffin Firewave is available, will the result of method 1 same as the result of method 3?
Or is it better to use a receiver instead of DAC?
 
I know I have so many questions, I hope I did not make it too troublesome. But I really want to know the answer from you guys. I really appreciate for those who read through this. I know my english sucks and cannot express myself very well. I do apologize for that. Anyway, please leave any thought on this, even a sentence or yes/no XD
Thank you sooooooo much
Frank
post #2 of 9
What kinds of audio outputs does your iMac have to begin with? And what do you have that will generate a 5.1 Dolby source (are you watching DVDs or what?).
post #3 of 9
Thread Starter 

my iMac have S/PDIF output(mini Toslink) which is capable of output 5.1 as well as normal stereo 3.5mm output.

Yes I mainly use for movie watching with DVD or files in VIDEO_TS or mkv and sometimes listen to songs.

post #4 of 9
Quote:
Originally Posted by HOCHUN0809 View Post

my iMac have S/PDIF output(mini Toslink) which is capable of output 5.1 as well as normal stereo 3.5mm output.
Yes I mainly use for movie watching with DVD or files in VIDEO_TS or mkv and sometimes listen to songs.

Your movie playback software *should* let you output AC-3 straight over the S/PDIF (TOSlink) output - you just need an external decoder. The ones you linked from Amazon should work, but they're likely to be extremely primitive; look for a theater decoder from the mid to late 1990s like the Technics SH-AC500D and go with that instead (it'll give you more configuration options); check Ebay.
post #5 of 9
Thread Starter 

Thanks for replying.

How about this one?

Do you think this one is better than those I listed before?

http://www.amazon.com/Digital-Audio-Decoder-Microsoft-XBOX360-X360/dp/B007S73DGQ/

post #6 of 9
Yeah that looks more adjustable, would probably do the job quite well. Gefen also makes a decoder, but I think it's around $250 iirc.
post #7 of 9
Thread Starter 

Alright thanks a lot.

I think if I cant get the griffin one then I will go with this one.

Lets pray it actually works lol

The Griffin Firewave once drop to $30 but I miss the chance to buy it frown.gif

 

Then I set up like this,
iMac -> optical digital output using mini Toslink -> the Xbox/ps3/ps2 DAC -> DAC output using 3 pairs of Y cable (2 RCA to a 3.5mm mini jack) and connect the to the back of the subwoofer of the speaker -> connect the other 6 satellite speakers from Subwoofer.
(so that i can control the volume of the whole set speaker via control on the subwoofer)
Is this setup correct and make real 5.1 surround sound finally?

Thanks again :)

post #8 of 9
Yes that would be correct, and set the DAC's volume output to 100% or thereabouts, and use the speaker system to adjust the volume (assuming that speaker system is able to do so).

You'll have to send a Dolby Digital signal out from the mac, which will be from a DVD or similar, for stereo music it will send out a stereo signal. smily_headphones1.gif
post #9 of 9
Thread Starter 

Thanks and I really appreciate all your help

THUMBS UP

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