I meet difficulty about Sigma Studio,The Prossesor is ADAU1446 and the block Crossovre is used in our design,The question is when we select Butterworth 12 there are 20 Byte data,but when we select Butterworth 18 there are 32 Byte data and Butterworth 24 there are 40 Byte data like the graph .I want to know how to generate these data ,

look forward to hearing from you soon

All of the filters are based on the basic 1st and 2nd order filters. To implement higher-order filters, these 1st/2nd order filters are just implemented in series. For example, to make a 4th order filter, SigmaStudio is just running two 2nd order filters with identical coefficients in series. This same idea is used to generate all filters with order higher than 2.