Vortex Media VTX 1000 - Manual (Page 60)

Output Filters
The ceiling loudspeakers may not be able to reproduce low frequency energy. Since the subwoofer that is
connected to the Vortex EF2241 handles that function, we will remove low frequency energy from the
ceiling loudspeakers via a Linkwitz-Riley high pass filter has been assigned to Outputs 1, 2, 3, and 4. The
cutoff frequency is 250 Hertz, meaning that below that frequency, the signal will be attenuated at a rate of
12 dB / octave.
60