Niles SI-1230 Installation & Operation Manual page 11

Adding Preamps to Create More Listening Zones
In the ultimate multi-zone system you would connect six stereo preamplifiers
(or a single component multi-zone or matrix preamp) to one SI-1230 and create
six completely independent stereo systems. A system like this allows six people
to simultaneously listen to different sources. Since the SI-1230 and the wiring
of your house is already capable of a system like this, you can easily upgrade
the number of zones in your system by simply adding another preamplifier and
changing the connections to the SI-1230.
TAPE PLAYER CD PLAYER
AM/FM TUNER
6 STEREO PREAMPS OR 1 MATRIX PREAMP
WITH 6 STEREO OUTPUTS
SI-1230
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
10