Each filter has the following editable parameters:

Type of filter

Allows to choose three different types of filter and different attenuation slopes:

Butterworth (But) at 6, 12, 18 or 24dB per octave,

Bessel (Bes) at 12, 18 or 24dB per octave,

Linkwitz-Riley(LR) a 12, 24 or 48dB per octave.

By setting the Thru value, the filter is disabled and the signal passes without its frequency being altered.

O P 1

L P F B e s 2 4

2 k 0 0 H z

0

Crossover frequency

Allows to choose the filter cutoff frequency.

O P 1

L P F

T h r u

1 k 4 6 H z

0

Phase

Allows fine control (in 5 steps) of the signal's phase.

The effect of this control is summed with that of the Output Polarity function (0 ~ 180 ).

In this way it's possible to adjust the phase of each individual output with 5 steps through a full 360 .

Note: this control is only in the Low-Pass Filter window.

O P 1

L P F

T h r u

1 k 0 0 H z

1 8 0

The values can be set in the following ranges:

XOVER

 

NAME

TYPE

SLOPE

FREQ

PHASE

 

 

 

 

 

 

 

Thru

 

 

 

 

 

 

 

 

 

 

 

But

Butterworth

6, 12, 18, 24 dB/oct

 

 

LPF

 

 

 

15.6Hz ~ 16KHz

0 ~ 180 (Stp 5 )

Bes

Bessel

12, 18, 24 dB/oct

 

 

 

 

 

 

 

 

 

 

LR

Linkwitz-Riley

12, 24, 48 dB/oct

 

 

 

 

 

 

 

 

 

Thru

 

 

 

 

 

 

 

 

 

 

 

Hish 6

Butterworth

6, 12, 18, 24 dB/oct

 

 

HPF

 

 

 

15.6Hz ~ 16KHz

 

Hish 12

Bessel

12, 18, 24 dB/oct

 

 

 

 

 

 

 

 

 

 

 

Notch

Linkwitz-Riley

12, 24, 48 dB/oct

 

 

 

 

 

 

 

 

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Nilfisk-ALTO 3.4 user manual F B e s 2, 4 6 H z, Crossover frequency, Phase