Yamaha V4.0 DME Designer V4.0 Owners Manual - Page 386

Chapter 6 Component Guide  LFP/HPF [Type] sets the attenuation slope and the filter type for the LPF and HPF. The selected items are displayed on the buttons. Clicking these buttons displays a menu. Combinations of six slope types and four filter types are available. [6dB/Oct], [12dB/Oct], [18dB/Oct], [24dB/Oct], [36dB/Oct], and [48dB/Oct] set the attenuation per octave. A low value produces gentle attenuation. A large value produces sudden attenuation. Type • THRU No filter is applied. There is no attenuation, which produces a level line at all frequencies. • AdjustGc (Adjustable Gc) With this setting, you can adjust Gc (gain on the cutoff frequency) between -6 dB and +6 dB. If you set -3 dB it becomes a Butterworth filter. If you set -6 dB, it becomes Linkwitz-Riley filter. When you select Adjustable Gc, the Gc knob is displayed. • Butrwrth (Butterworth) This filter has the most general characteristics. The pass band is flat and the gain for the cutoff frequency is -3 dB. • Bessel For curves where phase characteristics are important, Bessel has gentler attenuation than Butterworth, and there is little distortion of the waveform when square waves are passed through. • Linkwitz (Linkwitz-Riley) As second-order filters, the sum of the output voltages for LPF and HPF have a gain of 0 dB across the entire band. The pass band is flat, but the cutoff frequency gain is -6 dB. Butterworth Linkwitz-Riley Bessel 386 DME Designer Owner's Manual