I have had this receiver hooked up to my Mac computer via the digital toslink and sound has played through all the speakers in my 5.1 speaker system, but now I am only getting sound through the center and front right and left speakers.

You need to get an optical cable (Toslink cable) then you will be able to play your PS3 sound trough your davdz330

If it's an original 321 system (series 1) then it has an audio output on the back. (via RCA jacks) You would still need an amp or receiver to connect the speakers to.. (unless they're powered speakers)
If it's a 321 series II or 321 series III- it does not have an audio output.
If the system has a DVD tray right in the middle of the media center, then it's a series 1.
Otherwise, you'd have to get a 1/8 splitter to come from your Mac's headphone output. (still- you will need an amp/receiver or powered speakers to have both 'rooms' playing the same thing from your computer)

This is just how it works. The headphone jack on Macs is dual-purpose. If you plug in a mini-Toslink cable (like you have) it automatically sends the sound through that & increases the computer's volume to maximum. When you unplug the Toslink, the laser will still shine for a brief moment (but then it does go off). So, there is no way to keep the Toslink plugged-in AND utilize the built-in audio at the same time.

I have the same problem except i'm using a macbook and i'm trying to connect the speakers. My macbok accommodates optical digital audio output, but you have to buy a  a standard toslink cable with a toslink mini-plug adapter.  Since the speaker input is a digital coaxial (not fiber, optical) you have to buy a Digital Fiber Optical (Toslink) to Digital Coaxial (S/PDIF) Converter.  i haven't tried it, but i hope this solves our problem. i have the toslink now i just have to buy the converter. good luck to you.

you will need to go into the speaker setup and switch the sub setting from LFE to LFE+Main

hi there might be some problem with the link that u have hooked up with the speakers.

I have the same problem except i'm using a macbook and i'm trying to connect the speakers. My macbok accommodates optical digital audio output, but you have to buy a  a standard toslink cable with a toslink mini-plug adapter.  Since the speaker input is a digital coaxial (not fiber, optical) you have to buy a Digital Fiber Optical (Toslink) to Digital Coaxial (S/PDIF) Converter.  good luck. hope this helps

The Denon 688 does not process sound via HDMI, you have to run a seperate cable to get sound. Choices are analog audio jacks (red and white) or either a toslink (optical) cable or an rca digital audio cable.

Cheers!

It's a pain in the butt getting the system set up to use the TOSlink from your PC.

Try this:

1. Hit the DVD button.
2. Use MODE/SET to get to DVD/OPT
3. Turn DSP off.
4. Use the TEST/SETUP button to make sure your speakers all work
5. Screw with your sound card!