Controls

Bypass

The input signal is passed directly to the output, bypassing the filter signal processing.

Invert Polarity

When activated, inverts the output signal polarity.

Mute

Mutes the output of the filter.

Type

Variable Q

Filter characteristics vary with the level of boost or cut applied to the signal (using the Gain control).

Butterworth

Designed to have as flat a frequency response as possible in the passband, and roll off towards zero in the stopband.

For more information, see http://en.wikipedia.org/wiki/Butterworth_filter

Linkwitz-Riley

An infinite pulse response filter. It consists of a parallel combination of a low-pass and a high-pass Linkwitz-Riley filter.

For more information, see http://en.wikipedia.org/wiki/Linkwitz-Riley_filter

Bessel

A type of linear filter with a maximally flat group delay (maximally linear phase response).

For more information, see http://en.wikipedia.org/wiki/Bessel_filter

Slope

Sets the slope of the attenuation response curve for signals below the corner frequency, in 6dB/octave increments (Bessel and Butterworth filters) and 12dB/octave for Linkwitz-Riley filters.

Q factor

Adjust the Q-factor, the higher the Q the narrower and shaper the peak.

Frequency

Adjusts the filter cutoff or corner frequency. Signal components below this frequency are passed, components above are attenuated.

Gain

Sets the amount of attenuation at center frequency.

Response

Highpass output level.