TOA bs-1030 Mode D'Emploi

TOA Electronics Speaker Guide

34

This section is intended to serve as a quick reference to speed and ease system design. Keep in 
mind the following points to ensure best use of the tables.

Speaker height is relative to listener height. If the value for Height Above Listener is 2, that 
means the speakers are placed 2 ft above the expected ear level of the listeners.

Coverage Area and Spacing recommendations are based on an adjusted estimate of coverage 
(averaged over the frequency range 1–4 kHz) that accounts for both speaker dispersion and lis-
tener distance relative to the speaker. This may make the numbers appear smaller than those 
found in other design guides but they will more accurately reflect real-world performance.

Maximum On-Axis SPL figures are based on operation at the highest transformer tap. Pink 
noise power capacity is used for speakers without transformers.

Spacing recommendations for ceiling speakers are based on the radius of the adjusted coverage 
area (as described in Sound System Engineering) except that in this guide, the term Edge to Center 
is used to describe the condition when the edge of one speaker’s coverage overlaps up to the 
center of the next speaker’s coverage (center to center spacing in Sound System Engineering).

Ceiling

Coverage

angle

Floor

Speaker

Ceiling
height (h)

Ear
height (l)