Support Forums › Forums › FIR Designer Support › How to set well of the FIR designer and how to measure for the Speaker response › Reply To: How to set well of the FIR designer and how to measure for the Speaker response
Hi LangCheng,
Regarding (1), I don’t have any recommendations here. The measurement location is for the user to decide, to suite their application.
Regarding (2), if you’re goal is only phase correction, I suggest using both the manual ‘Phase Adjust’ tab and the ‘Auto Phase’ tabs. For an example, watch the ‘FIR Designer 3.0 Complete Overview’ video.
Phase correction down to 300 Hz can require a fairly long filter. Ignore 256 taps @ 48 kHz and start with at least 512 taps. To better understand the effect of length, read our white-paper at the following link. (Specifically, see Section 5.)
Regarding (3), the ‘FIR Filter Delay’ relates to time=0 reference when designing the FIR filter. For most FIR filter designs, it corresponds to the peak location of the FIR filter coefficients. Since you are phase correcting, you will likely need to set the delay greater than 0. How much depends on your filter design.
Again, watch the ‘FIR Designer 3 Overview’ video and read the white-paper. (Specifically, see Section 7.)
Best regards,
EA Support