Martin Logan Helos 12 Mode D'emploi page 6

Figure 6. Helos 12: Adding surround channels to
create a 5- or 7-channel installation.
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eLos LaCement
Figure 8. Helos 22: Stereo mode reproducing both
the left and right surround channels.
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Figure 7. Helos 12: Distributed audio.
Figure 9. Helos 22: Wide dispersion. Mono mode
reproducing the rear center surround channel.