Can you buy a DD 5.1 speaker system and get multichannel Dolby Digital audio playback from a Mac? What software DVD player do you have to use? Does the software DVD player that comes with OS 10.2 feature S/PDIF output to a DD 5.1 capable speaker system?

Try asking on this forum:

DV Info

No, unfortunatly at this time apple does not support 5.1 channel DVD playback.

However, it is still possable to achive this. You need to get Sonica ($90) from m-audio. Its a USB sound device that supports multi-channel. Using this device coupled with "VLC DVD" (also avialable from the m-audio site), a Linux player that "kindof" works under OS X, and a 5.1 speaker system, such as the remarkable Klipsh Pro Media THX 5.1 ($350-400), you can listen to movies in Dolby 5.1 on your Mac.

That said, here is a less expensive alternative that i opted to go with for my Mac set-up. Logitec z-560 is a THX certified 4.1 system with a great two chanel matrix to upmix the sound to 4 channels. All of my movies and music sound great on this, and it works fine with apples built in sound card (the Klipsh 5.1 does not). Bes of all it costs about half of the Klipsh + Sonica, at only $170-250.

I Hope that helps!

<------- 100th Post!

Forgot the links-

Sonica & VLC DVD here

Logitech THX 4.1 here

ProMedia 5.1 here

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The Altec Lansing ADA-885 model has various playback modes, including a few expanded matrixed 2 channel modes. But they don't sound as good as real Dolby Digital multichannel playback. I'm not going to buy a 4.1 or 5.1 speaker setup for a computer system unless I can get real Dolby Digital playback through it. Some PC systems (such as a couple models made by Yamaha) even over DTS playback.

I think it is surprising Apple doesn't support DD 5.1 output to multichannel speaker systems at this time. I mean, really, all it takes it just being able to output S/PDIF data (without screwing around with the bitstream, dammit) to an outboard speaker system with its own built in decoders.

Apple DVD for OS X does not support DD or DTS output at this time. However, DVD in mac OS 9 does. I would like to see the following things in the next year. 1) A 5.1 soundcard for mac 2) Digital out support for os X DVD 3) Dolby Headphone in OS X DVD. Apple designs great stuff, but for a company that is focusing it's efforts on media development, i wish that thy would put more into their audio cards.

BTW- I failed to metion that the sonica only provides the digital output port, you will still need a DD or DTS decoder in addition to the pro media. Overall you're looking at $700 to get 5.1 sound.

$200 looks alot better for an incredible speaker system. I urge you to go to Best buy and give the logitech THX z-560 a listen. You won't be dissapointed.
You may also want to read the latest issue of Mac Addict. It has an article about using your mac as an entertainment center.

Micheal- Yes I do fully understand the concept of matrix surround and I agree that "upmix" was probably the wrong term to use. My Bad. I suspect that your buddy with the mac studio is using OS 9. (ProTools is not yet ported to OS X) All of my posts on this topic refer to the new Mac OS X.

Bobby - I guess the bottom line is this - If you want DD fromyour mac, you need to use OS 9. OS X isnt ready for DD yet, but if you must use it, I'm suggesting the Logitech. It absoulutly runs circles around the HK sound sticks and the JBL 3 piece creature, both in dynamic range and frequency responce.

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My PC fan is incredibly loud. Obviously I have the wrong fan, but it is a rather popular fan. It is slightly louder than the Mac fan, but not as loud as when the G4 when into "hyper turbo" mode.

There is a fix for the loud fan noise in da Mac:

Make a connector adapter: fan socket to standard hard drive power connector. Connect the fan power lead to the 5V HD lead (not the 12 V) and bridge the free fan connector pins at the mother board with a 20 ohm 10 watt resistor. (From fan data: 12V 600 ma P= IV = 7.2W)) Plug the fan socket into the adapter and the HD socket into one of the available free hard drive connectors inside the Mac. The big fan will now run constantly but the 5V connection runs it at much reduced speed.

The resistor is necessary because the heat sensing circuit needs to see a load when it decides to supply power to the fan. If the load is not there the circuit unceremoniously shuts off the Mac, a nice safety feature, Apple! This resistor is big and needs to be mounted to the metal side wall of da Mac.

This Mac running OS 9.2.2 has been exercised for some four days now working with Netscape, Canvas, Excel and GraphicConverter open and doing their thing: Surfing, manipulating photographs, doing statistics pretty much constantly. No temperature rise to note during these operations.

Also, there are plenty of 5.1 cards for the Mac.