Tony,
A cable with an 1/8-inch, stereo plug that splits to two, male, RCA plugs came with your system. Go to Radio Shack and pick up a pair of RCA female to 1/4-inch male phono adapters.
Plug the adapters into the RCA plugs, and plug them into your Tyros 1/4-inch output jacks.
Plug the 1/8-inch, stereo, male plug into the side of the remote receiver where you see the little mucical notation symbol.
On the back of the remote receiver there is a small toggle switch. Place that switch in the full upright position (6-channel direct)
Now, turn on the keyboard, then turn on the Z-5500. Turn the volume of all satellite speakers to maximum and set the subwoofer to aproximately 25 percent of maximum.
Set the effects to PRO LOGIC MUSIC II MUSIC. This activates all 5 satellite speakers and the sub woofer and provides the full, surround-sound effect that will give you the best results.
Turn the keyboard's master volume up to the halfway point. Now, using the master volume control, either on the wireless remote, or the receiver, adjust the volume to a comfortable level.
You'll be amazed at what you will hear, and so will your audiences. Keep in mind that when you crank up the master volume to maximum, there are boost levels that are well above maximum. Even with a relatively large audience of 125 people, I've never had to go above Boost 4 to provide all the volume necessary to entertain them and fill the dancefloor. If you go too high, and also crank up the keyboard's main volume as well, you could damage the satellite speakers.
A note of caution: Do not place the remote receiver on top of the subwoofer. The vibration of the sub can damage the receiver, and there have been a few users that had this problem.
Good Luck,
Gary
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Travlin' Easy