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<blockquote data-quote="Ivan Beaver" data-source="post: 98968" data-attributes="member: 30">Re: Prediction: visualizing phase contoursIt is not as easy as people would like to make it out to be.First of all-how many companies (besides Danley) even SHOW a phase response?&nbsp; There might be a reason--------------------------------------------Second-exactly how do you determine what the &quot;correct&quot; phase response is?&nbsp; If you change the receive delay even just a small tad-the phase response (as shown on the display) will change quite a bit-especially at the higher freq.So you can have displays that show very different phase responses-yet nothing has changed with the speaker-just with the way it is measured.So what is correct?&nbsp; Why?&nbsp; Yes you can easily draw a &quot;textbook&quot; phase reponse-but in almost every case the speaker does not exhibit that response-ESPECIALLY if you move the mic to a different listening position.&nbsp; The worse the loudspeaker (in terms of driver offsets) the worse it will get.So collecting the data is the first hard part-and then what do you do with it- is the next hard part.&nbsp; And how do you actually compare it to other products-that don&#039;t even provide the data.So without others to compare to-you have to real &quot;reference&quot; as to whether a speaker is good or bad-as compared to another.</blockquote>

[QUOTE="Ivan Beaver, post: 98968, member: 30"] Re: Prediction: visualizing phase contours It is not as easy as people would like to make it out to be. First of all-how many companies (besides Danley) even SHOW a phase response? There might be a reason-------------------------------------------- Second-exactly how do you determine what the "correct" phase response is? If you change the receive delay even just a small tad-the phase response (as shown on the display) will change quite a bit-especially at the higher freq. So you can have displays that show very different phase responses-yet nothing has changed with the speaker-just with the way it is measured. So what is correct? Why? Yes you can easily draw a "textbook" phase reponse-but in almost every case the speaker does not exhibit that response-ESPECIALLY if you move the mic to a different listening position. The worse the loudspeaker (in terms of driver offsets) the worse it will get. So collecting the data is the first hard part-and then what do you do with it- is the next hard part. And how do you actually compare it to other products-that don't even provide the data. So without others to compare to-you have to real "reference" as to whether a speaker is good or bad-as compared to another. [/QUOTE]

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