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TA-500 user manual
High Pass Filter
In A Freq Shape
HPF 20.0Hz LR24
Knob A: Frequency, out (off), 10.0Hz to 25.6kHz in variable steps
Knob B: high pass filter type
System high pass filtering is provided for the input signal. This is the preferred location for
high pass filtering as it affects all outputs and can therefore improve inter-band phase
relationships. Filter type is selectable from Butterworth, Bessel, Linkwitz-Riley and Hardman.
Filter slopes of up to 4th order or 24dB / octave are provided. Not all filter types are available
in all slopes. For example 18dB / octave Linkwitz-Riley filters do not exist.
The Hardman type filter is always described by its’ order as the filter becomes progressively
steeper rather than following a linear slope so a dB/octave description is not accurate.