Setting the Subwoofer gain

Figure 21

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Disconnect the speakers from the power ampliﬁers.

Connect the MF/HF power ampliﬁer to the Subwoofer output of the unit.

Set the output level of the oscillator to zero and connect it to the appropriate test input socket.

Set the oscillator frequency to 25Hz.

Set Bank 1 Switch 1 to ON.

Set Bank 4 Switch 2 to ON.

Set Bank 2 Switches 2 & 3 to OFF.

Connect the AC voltmeter to the output terminals of the MF/HF ampliﬁer.

Raise the output level of the oscillator until the meter reads 2 volts.

Substitute the LF power ampliﬁer for the MF/HF power ampliﬁer. Do not alter the output setting of the oscillator.

Set Bank 4 Switch 2 to OFF.

Adjust the Subwoofer output gain control (C14) until the meter again reads 2 volts.

Conﬁgure the dipole lobe for a CT8 DS

Set Bank 3 Switch 3 as required by ﬁgure 21 according to the position of the CT8 DS in the system.

Set Bank 3 Switch 2 as desired according to preference and Bank 3 Switch 3 as required by ﬁgure 21.