Optical audio output cuts out

I searched for some answers to this and didn't find any. I didn't even find any reference to the same problem.
I have a PowerMac G5 Dual 2.7GHz and running 10.4.9. I need to get digital audio from my G5 to my theater in another room. I bought an optical-coaxial digital audio converter and used an optical cable and a 50ft coaxial digital audio cable to make the connection. Sound cuts out constantly about every second. I've tried playing material from Final Cut Pro, iTunes, Quicktime Pro, and Finder and get the same results so I know it's not any of those specific apps causing the problem. I have the latest versions of everything, OS, applications, and firmware.
I tested the optical-coaxial adapter, optical cable, and the 50ft coaxial digital audio cable on another source and it worked perfectly. Any idea how I can fix this? Is there a setting or preference somewhere or is it a hardware issue? Anyone else out there have this problem?

Here's what I've tried and whether it worked or not. In all instances where the optical-coaxial adapter is used I used the 50ft coaxial digital cable.
1. G5 to home theater via optical-coaxial adapter = doesn't work at all anymore.
2. MacBook Pro to home theater via optical-coaxial adapter = doesn't work at all
3. G5 to MacBook Pro via optical cable = works
4. MBP to G5 via optical cable = works
5. AppleTV to home theater via optical-coaxial adapter = works
6. DVD player to home theater via optical-coaxial adapter = works
7. MBP to home theater via optical cable = works
I tried with 3 different optical cables and also tried using the coaxial cable as a video cable (the green or Y in a component video connection) to make sure it was okay. In the case where the MBP was used I have a mini-toslink to toslink cable.
Is it possible the strength of the optical signal coming out the G5 and MBP just isn't strong or isn't to standard so the adapter doesn't recognize it? Odd that it works from the AppleTV but not the G5 or MBP. I would really like to get this working so I can show FCP projects on the theater.

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Optical audio output cuts out

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