This was performed by our friends from DCC Xpress installations.
They offer high quality WOWSound installations for a flat rate complete with free return shipping!
You can find them at:

These items are available in the WDK-BAC-3 which was used for this installation.
AS-MB2-NC Motherboard WOW121-Diesel Decoder UNIV-SH1-C Speaker Kit KA3 Keep-Alive™
Click here for more information on the WDK-BAC-3 and the rest of the WOWDiesel Kits line.