A constant-directivity horn cannot reproduce low frequencies, so a separate woofer is required.

Evidence

A single constant-directivity horn speaker 7.5 m above ear height Mounting the speaker higher up, as shown in Figure 7.46, reduces the path variations between the front and back row. By making the speaker directive, we can ensure that more of the sound goes to the audience. However, we have to handle the low frequencies with a separate loudspeaker because of the frequency limitations of the constantdirectivity horn. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2524

Categorization

• DEFINE: Defines the directivity-versus-bandwidth tradeoff in horn loudspeaker design.