ThomJ Posted April 29, 2006 Share Posted April 29, 2006 Heres a fing Can someone out there point me in the direction of a definition or description of the levels and shapes (I think) relative to digital controllers - buttworth etc, Our systems spec say that they require 6th level eq for the Bass and Sub - what difference would 4th level make for instance? Still learning at 43 (who'd have thort) Thom Link to comment Share on other sites More sharing options...
thcousins Posted April 29, 2006 Share Posted April 29, 2006 I always find wikipeadia is a good place to start. Try this link: http://en.wikipedia.org/wiki/Audio_crossover It only appears to explain as far as 4th level, but is a good starting point and covers Linkwitz-Riley, Bessel and Butterworth! Aslo links to other sites and resourses. Hope this helps. Tom Link to comment Share on other sites More sharing options...
Simon Lewis Posted April 29, 2006 Share Posted April 29, 2006 4th order = 24dB per octave crossover6th order = 48dB per octave crossover Looks like your system needs to have extremely sharp cutoff rates! Some digital units can achieve this. The difference between Butterworth, Lipshitz (sp?), Linkwitz-Riley etc. is down to filter theory and how the signal behaves in both amplitude and phase in and at the edge of the passband. Have a look in the reference section of Rane.com for more information. Ensure you have your maths text book open ;-) Simon Link to comment Share on other sites More sharing options...
thcousins Posted April 29, 2006 Share Posted April 29, 2006 Simon, 4th order = 24dB per octave crossover6th order = 48dB per octave crossoverI'm no noise boy, but surely you mean: 1st order =6dB per octave 2nd order =12dB per octave 3rd order =18dB per octave 4th order = 24dB per octave 5th order = 30dB per octave 6th order = 36dB per octave Each cap and coil adding 6dB/octave? Tom Link to comment Share on other sites More sharing options...
Simon Lewis Posted April 30, 2006 Share Posted April 30, 2006 Yes, you are completely right! That will teach me to rattle off answers without engaging brain first! I suspect that I had the rationale for Linkwitz Riley filters in mind, where even order Butterworth filters are cascaded to form a new filter of twice the slope with good electrical summation and zero acoustic lobing at the crossover frequency.... Link to comment Share on other sites More sharing options...
thcousins Posted April 30, 2006 Share Posted April 30, 2006 Either way, you're right, the system does need very fast cut of rates! Link to comment Share on other sites More sharing options...
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