Electro-Voice 2181F, XI-2181 manual Frequency Response

Xi-2181 Bass System

Figure 2 — Frequency Response

The frequency response of the Xi was mea- sured on axis in the far field in an anechoic environment using a swept sine-wave sig- nal. One watt of power (2.00-volts rms at 70 Hz) was applied to the mid band of the low-frequency section. The sound pressure level was normalized for an equivalent one- meter distance.

Without Crossover and EQ With Crossover and EQ

Xi-2181 Bass System

Figure 3 — Beamwidth

The beamwidth of the Xi , (i.e., the included horizontal and vertical coverage angles at the -6-dB points) was measured with a full- spherical measurement system as described in Figure 1.

Figure 4 — Directivity

The directivity index, Di, and directivity fac- tor, R , of the Xi-2181 were measured with a full- spherical measurement system as de- scribed in Figure 1.

5

DIRECTIVITY FACTOR R

θ

Q