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<blockquote data-quote="Peter Morris" data-source="post: 140792" data-attributes="member: 652">Re: Infocomm???What happens with a tapped horn when you subject it to a step function is that the cone immediately starts more. Sound is produced from the back exposed driver.Some time later the sound from that first movement of the cone makes its way around the horn and emerges (depending on the length of the horn) about 7ms latter but opposite in polarity.Because we are dealing with a very low frequencies and a limited band width, in practice its not as huge of an issue as it appears from a quick look at the impulse response.&nbsp; i.e. only really compare / look at the spectrogram below about 100Hz.&nbsp; In comparison a real horn or reflex enclosure has a much better looking impulse response.When you model it the impulse pulse looks like this - The top impulse response and spectrogram is a 21&quot; reflex enclosure,&nbsp; the bottom is the same driver in a tapped horn</blockquote>

[QUOTE="Peter Morris, post: 140792, member: 652"] Re: Infocomm??? [FONT=Calibri][SIZE=3][COLOR=#000000]What happens with a tapped horn when you subject it to a step function is that the cone immediately starts more. Sound is produced from the back exposed driver. Some time later the sound from that first movement of the cone makes its way around the horn and emerges (depending on the length of the horn) about 7ms latter but opposite in polarity. Because we are dealing with a very low frequencies and a limited band width, in practice its not as huge of an issue as it appears from a quick look at the impulse response. i.e. only really compare / look at the spectrogram below about 100Hz. In comparison a real horn or reflex enclosure has a much better looking impulse response. [/COLOR][/SIZE][/FONT] [SIZE=3][COLOR=#000000][FONT=Calibri]When you model it the impulse pulse looks like this - [I]The top impulse response and spectrogram is a 21" reflex enclosure, the bottom is the same driver in a tapped horn[/I][/FONT][/COLOR][/SIZE] [/QUOTE]

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