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<blockquote data-quote="Jay Barracato" data-source="post: 39268" data-attributes="member: 24">Re: Virtual SMAART training: Tell the crossover frequency and typeAre you all reading the change in phase as going from +90 to -90 directly at 2000hz, or would you include the continuing change (like I did) after that until the phase response is solely the response from the hf?For the 180 degree phase shift based solely on the 2000 hz, I would probably up my guess to 4th order also. It looks to me like the slope of the filter is fairly steep.I am still thinking Bessel due to the lowered response at the crossover.edit- it appears from the phase trace that by 4000hz (1 octave from the&nbsp; crossover) that the LF is no longer contributing anything to the measurement and the trace is solely based on the HF, so I guess my question is how many db down would the LF have to be (6, 12, 18, 24) not to contribute to the response?</blockquote>

[QUOTE="Jay Barracato, post: 39268, member: 24"] Re: Virtual SMAART training: Tell the crossover frequency and type Are you all reading the change in phase as going from +90 to -90 directly at 2000hz, or would you include the continuing change (like I did) after that until the phase response is solely the response from the hf? For the 180 degree phase shift based solely on the 2000 hz, I would probably up my guess to 4th order also. It looks to me like the slope of the filter is fairly steep. I am still thinking Bessel due to the lowered response at the crossover. edit- it appears from the phase trace that by 4000hz (1 octave from the crossover) that the LF is no longer contributing anything to the measurement and the trace is solely based on the HF, so I guess my question is how many db down would the LF have to be (6, 12, 18, 24) not to contribute to the response? [/QUOTE]

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