Yamaha DME - Manual (Page 372)

Chapter 6 Component Guide
DME Designer Owner’s Manual 372
■ 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.
• 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.
Type
Linkwitz-Riley
Butterworth
Bessel