Niles Audio Niles RS8Si Sandstone - Manual (Page 7)

Figure 1 shows how this would work for a square area of 44 feet by 38 feet and
using the
RS8Si’s in the one-speaker stereo mode. The loudspeaker coverage
pattern is shown in the diagram.
With the loudspeakers wired in the one-speaker stereo mode you can cover large
areas with the highest quality stereo imagining available.
Two-speaker Stereo Mode
In this mode, each loudspeaker will have one amplifier speaker cable connected to
both loudspeaker connection cables and it will take two loudspeakers to play in
stereo. To obtain the best stereo imagining possible, use stereo outputs from the
amplifier and alternate the speakers, in your layout. You should place speakers less
than 11 feet from the sides of the listening area and 18 feet from each other. The
row spacing should not be greater than 28 feet. These loudspeaker spacing rules are
the recommended maximums; placing speakers at a greater distance apart will
negatively affect sound coverage and reduce their stereo effect. Placing speakers
closer together will improve sound coverage and produce more stereo coverage.
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Figure 1 Stereo Coverage 4 speakers