Martin Audio WLXGS manual Tutorial on spaced systems, Island stages not shown, Reflections

Island stages (not shown)

Island stages are simply four-sided versions of examples 3 and 5 and should be aligned using the same process.

Tutorial on spaced systems

Whenever two or more loudspeaker systems are fed with the same signal and their coverage overlaps, sound addition and subtraction will take place depending on the listener’s position.

In the following example, the off-axis listener may hear delayed sound from the right hand system.

The two loudspeakers are driven in phase (both were +ve just before the instant shown) but the extra distance travelled by the second (R) signal causes it to be out of phase at the listener position at that particular frequency (R is -ve while L is +ve).

Reflections

Remember that a strong side wall reflection will act like a second source and the direct and reflected signal will combine as if they were two sources.

The following illustration shows what will happen. The direct signal will combine with the reflected signal as if it were a phantom source in the position shown.

All material © 2007. Martin Audio Ltd. Subject to change without notice.