All tutorials related to equalization of a system with miniDSP platforms.
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 denver8me4dinner Topic Author Offline Platinum Member 3038564518 Posts: 481 Thank you received: 87 I have a set of 2x4HDs I use the APF function and it's fantastic for in car. So I can measure acoustic response and get it pretty good however is a 2nd order APF My question is How do I use biquad to make a phase shift by 11.25 deg and 22.5 deg? Would that be a first order APF ? I tryed using spreadsheet and it won't work right? Can anyone point me to a calc that doesn't use APF order but rather the degrees in phase (even tho one in same) just easier for me to figure out. Or explain exactly what a APF at what order and what Q would be a 11.25° and 22.5° Phase shift (at whatever corner frequency....I'll probably use the crossover point which could be anything. But that's important too... When I look at spreadsheet the Q determines how fast the phase changes but it never stops at a specific degree it keeps going to -180 any help much appreciated Cheers Please Log in or Create an account to join the conversation.

 dreite Offline Platinum Member Posts: 1709 Thank you received: 756 A first-order all-pass has a phase shift from 0 to 90 degrees. You could use the supplied miniDSP spreadsheet to create a first-order all-pass by inputting different formulas to process the Frequency and Fs values. In that case, the b2 and a2 coefficients will be zero. However, I'm puzzled by your objective. First-order and second-order all-pass functions are for duplicating the phase-shifts of appropriate crossovers. What characteristic/application could you have that would need a 11.25 or 22.5 degree correction?? Dave. The following user(s) said Thank You: devteam Please Log in or Create an account to join the conversation.