tl.crossover4~ 4th order Linkwitz-Riley crossover filter (high and low). This is a commonly used high-end crossover filter for loudspeakers. It is a 24 dB per octave crossover filter with each filter down 6 dB at crossover. An important feature of the filter is that the two drivers (the low and high passed filters) are actually in phase at all frequencies. That is, even though the filters have their own characteristic phase responses the phase difference between the two output signals is the same at all frequencies. As a result, each filter section has the same group delay.

from the library : tl.objects Format : External Environment : max / msp freeware Max 4.x http://www.trondlossius.no/software http://francois.eudes.free.fr/maxmsp_temp_page.htm