Audio sync issues with Optical Toslink Airport Express

Hello
I have 2 airport expresses. One connected via mini to RCA to some Logitech speakers.... And the other via mini to Optical into my Bose T20 receiver. The Bose is def a few milliseconds behind the Logitech and my computer..... Probably due to the optical cable in the Bose receiver.
Am I to to understand switching to the RCA in the Bose should correct this delay?.... The price being losing on digital audio quality in place of analogue?!!
Can someone please advise if I can somehow get the Logitech connected airport express to have a delay so it syncs that way?
Appreciate any help.
Cheers

At this point I would recommend that you look for signs of Wi-Fi interference that may be preventing your Express from providing the best signal possible ... even in the same room.
An excellent tool to measure signal quality, built into OS X Mountain Lion, is the OS X Wireless Diagnostics:
Option-click on the AirPort icon on the OS X menu bar.
Select "Open Wireless Diagnostics..."
Enter your Mac's Administrator credentials in the next window.
On the Wireless Diagnostics window DO NOT click on "Continue." Instead, go to the diagnostic's menu bar, and then, select Window > Utilities
Start the test with the laptop near the wireless router. Note the values for RSSI and Noise. They should both be negative and measured in dBm.
Now take the laptop to the other locations that you want to access the Internet in your home. Different rooms, different floors, etc. Again, note these same two values at each of these locations.
When you have finished collecting the data, you will want to enter them into the following formula for Signal-to-Noise Ratio (SNR). SNR = RSSI - Noise. For example, if your get the following readings: RSSI = -61 dBm and Noise = -84 dBm, SNR = (-61) - (-84) = 23 db
To get decent wireless bandwidth performance at a location you will want the SNR value to be 25+ dB.

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