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<blockquote data-quote="Mark DeArman" data-source="post: 140793" data-attributes="member: 950">Re: Infocomm???Well, I know some people who put a lot of weight into impulse response analysis.&nbsp; I&#039;m not sure I agree with its practicality for measuring loudspeakers.&nbsp; One big issue which I have seen trip people up, is measuring the box outside of its usable bandwidth, and then trying to visually analyze the impulse response.&nbsp; For a front loaded HP enclosure, typically the usable bandwidth where the box behaves as a LTI-minimum phase system, is quite large, say 10-500Hz.&nbsp; You then look at a more complicated system like a tapped horn, bandpass enclosure or something else on the same bandwidth, and try to visually inspect the impulse response?&nbsp; This makes no sense to me, and I&#039;ve seen people make some pretty wild claims about boxes (having serious problems), when their entire measurement methodology is flawed.There are other techniques of decomposing the impulse response into pieces vs. frequency which make this type of analysis much easier, but they are not really common in audio analysis yet.&nbsp; In fact, Peter in his DIY thread had posted a link to one of the first programs I have ever seen which starts to venture into this type of thing.Anyway, I keep going way off topic here,Mark</blockquote>

[QUOTE="Mark DeArman, post: 140793, member: 950"] Re: Infocomm??? Well, I know some people who put a lot of weight into impulse response analysis. I'm not sure I agree with its practicality for measuring loudspeakers. One big issue which I have seen trip people up, is measuring the box outside of its usable bandwidth, and then trying to visually analyze the impulse response. For a front loaded HP enclosure, typically the usable bandwidth where the box behaves as a LTI-minimum phase system, is quite large, say 10-500Hz. You then look at a more complicated system like a tapped horn, bandpass enclosure or something else on the same bandwidth, and try to visually inspect the impulse response? This makes no sense to me, and I've seen people make some pretty wild claims about boxes (having serious problems), when their entire measurement methodology is flawed. There are other techniques of decomposing the impulse response into pieces vs. frequency which make this type of analysis much easier, but they are not really common in audio analysis yet. In fact, Peter in his DIY thread had posted a link to one of the first programs I have ever seen which starts to venture into this type of thing. Anyway, I keep going way off topic here, Mark [/QUOTE]

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