What you’re expecting is what happens when the LF rolloff is minimum phase. What is shown is what happens when the LF rolloff is linear-phase.
To investigate the effect more, run FIR Designer without any loudspeaker measurement on the Import tab, then put a HPF filter either on the IIR filters tab or the Mag Adjust tab. If using the Mag Adjust tab, try minimum and linear phase and watch the effect on the step response. Examples below.
BTW In your screenshots, check “Show FIR Filtered loudspeaker” to see all filtering applied to the measurement. This is what is used to create the step response.
- This reply was modified 1 year, 2 months ago by EA Support.