It is possible to use dipole speakers instead of surround speakers and surround back speakers. A dipole speaker is bidirectional speaker outputting the same sound in two directions, for example forward and backward.
An arrow for matching the phases (＊) is marked on a dipole speaker. Place the surround speakers (a) so that their arrows () point to the TV and the surround back speakers (b) so that their arrows () point to each other.
＊Phase: A waveform position in one cycle (0 to 360 degree) of sine wave. If the phases do not match due to mistake in speaker distance, installation angle or positive (+)/negative (–) of wiring, sound image and sound field may be unclear or hard of listening.