Klipsch KPT-1802-HLS Manual Del Usuario página 4

PLACEMENT
The KPT-1802-HLS is designed for behind-the-screen placement on the
floor and against the back wall for quarter-space loading producing
6dB additional output vs. half space (no boundary other than the floor).
For larger theaters dual subs positioned next to each other, wired in
parallel, gain an additional 6 dB in output, due to efficiency gains from
mutual coupling (3 dB) and the added power handling of the second
subwoofer. (3 dB)
SINGLE SUBWOOFER QUARTER SPACE FLOOR/WALL PLACEMENT
Additional mutual coupling occurs for up to 4 subwoofers placed next
to each other. An asymmetrical configuration of multiple subwoofers
minimizes standing wave stimulation for more even bass throughout
the theater.