- ページ 9

クロスオーバー Ashly PROTEA SYSTEM II 4.24CのPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。Ashly PROTEA SYSTEM II 4.24C 20 ページ。 24 bit digital crossover and system processor
Ashly PROTEA SYSTEM II 4.24C にも：テクニカルノートと仕様 (2 ページ)

ページを印刷する

Operating Manual - PROTEA SYSTEM II 4.24C Crossover / System Processor

slope for every application, so experiment to see which one sounds most pleasing in a specific system. Ashly factory

default presets use all 24dB/octave Linkwitz-Riley filters in the crossover section, but of course they can be changed

to suit the application.

In addition to the frequency and slope, crossover filters can be selected as having Butterworth, Bessel, or

Linkwitz-Riley response. These refer to the shape of a filter's slope at the cut-off frequency, affecting the way two

adjacent pass bands interact at the crossover point. 24db/octave Linkwitz-Riley filters produce a flat transition through

the crossover region, assuming both overlapping filters are set to the same frequency, slope, and response type. 24dB/

oct Linkwitz-Riley filters are the industry standard, the easiest to use, and the filter type recommended by Ashly.

Other filter types are available, but may require polarity switching or other adjustments for proper results. The follow-

ing paragraphs offer a summary of the three filter types as used in the 4.24C crossovers.

Butterworth

Butterworth filters individually are always -3dB at the displayed crossover frequency and are used because

they have a "maximally flat" passband and sharpest transition to the stopband. When a Butterworth HPF and LPF of

the same crossover frequency are summed, the combined response is always +3dB. With 12dB per octave Butterworth

crossover filters, one of the outputs must be inverted or else the combined response will result in a large notch at the

crossover frequency.

Bessel

These filters, as implemented on the 4.24C, are always -3dB at the displayed crossover frequency. Bessel

filters are used because they have a maximally flat group delay. Stated another way, Bessel filters have the most linear

phase response. When a Bessel HPF and LPF of the same crossover frequency are summed, the combined response is

+3dB for 12dB/oct, 18dB/oct, and 48dB/oct Bessel filters, and -2dB for 24dB/oct Bessel filters. One of the outputs

must be inverted when using either 12dB/oct or 18dB/oct Bessel crossover filters or else the combined response will

have a large notch.

Linkwitz-Riley

The 12 dB/oct, 24dB/oct and 48dB/oct Linkwitz-Riley filters individually are always -6dB at the displayed

crossover frequency, however the 18dB/oct Linkwitz filters individually are always -3dB at the displayed crossover

frequency. The reason for this is that Linkwitz-Riley filters are defined in terms of performance criterion on the

summing of two adjacent crossover HPF and LPF filters, rather than defined in terms of the pole-zero characteristics of

individual filters. The 18dB/oct Linkwitz-Riley individually are 18dB/oct Butterworth filters in that they have

Butterworth pole-zero characteristics and also satisfy the criterion for Linkwitz-Riley filters.

When a Linkwitz-Riley HPF and LPF of the same displayed crossover frequency are summed, the combined

response is always flat. With 12dB/oct Linkwitz-Riley crossover filters, one of the outputs must be inverted or else the

combined response will have a large notch at the crossover frequency.