Operating Manual - nX, nXe, and nXp Power Amplifiers
36
4) Crossover
Functions
Four-Way, Three-Way, and Two-Way Crossover (outputs only)
The Crossover tool offers a convenient way to configure amplifier outputs. Depending on whether the desired crossover is two,
three, or four-way, all High-Pass (HPF) and Low-Pass Filters (LPF) are automatically placed on output channels. Initial crossover
frequencies are assigned with the default filter type of 24dB/oct Butterworth, both of which can be changed. In the frequency
response display screen, all currently loaded filter frequencies are available for editing by Left-Click dragging a HPF/LPF node,
or by using the text boxes below the GUI.
Warning
: High Pass Filter determines the lower frequency limit of the signal, while the Low Pass Filter determines the upper
frequency limit. Be careful not to accidentally send low frequency signals to high frequency drivers. Check the loudspeaker
specifications to determine a safe operating frequency range.
Available Filter Types:
Bessel
- 2nd, 3rd, 4th and 8th order (12, 18, 24, 48 dB/octave)
Butterworth -
2nd, 3rd, 4th and 8th order (12, 18, 24, 48 dB/octave)
Linkwitz-Riley -
2nd, 4th and 8th order (12, 24, 48 dB/octave)
The following paragraphs summarize the three primary filter types offered:
Butterworth
Butterworth filters individually are always -3dB at the displayed crossover frequency and have a "maximally flat" passband and
sharpest transition to the stop-band. When a Butterworth HPF and LPF of the same corner frequency are summed, the combined
response is 3dB. Note that when 12dB/octave Butterworth HPF and LPF filters are used to create a crossover, the
polarity of one of the outputs may need to be inverted to compensate for the phase shift of the filter.
