Bose EdgeMax EM90 Design Manual page 4

EdgeMax Loudspeaker Overview
Figure 2. To provide a consistent tonal balance across the coverage area in-ceiling
loudspeakers must be closely spaced together.
Surface-mounted loudspeakers do not offer the same aesthetic advantage, but are preferred
when consistent tonal balance across the coverage area is the primary design objective This is
due to the physical nature of how surface-mounted loudspeakers project sound
Surface Mounted Loudspeaker
Figure 3. Typical projection of a surface mounted loudspeaker
vertical coverage into a room.
Typically, the best performing types of surface-mounted loudspeakers are two-way products
with a high-frequency section that delivers controlled coverage angles, and a ported
enclosure for low-frequency reproduction This arrangement results delivers more consistent
high-frequency coverage and balanced frequency response to a larger area In addition,
surface mounted loudspeakers benefit from boundary loading, further improving the low
frequency response of the system
Despite these performance benefits, in-ceiling loudspeaker designs are still heavily preferred
due to the aesthetic preference of architects and interior designers looking to minimize the
appearance of loudspeakers
Design Guide - 4
Conical Ceiling Loudspeakers
Average
Listener
Height
(1.5 m | 5 )
High Frequency Coverage Angle
Average
Listener
Height
(1.5 m | 5 )
Published Coverage Angle
High Frequency Coverage Angle