2Pi Towers [message #46171] |
Sat, 22 January 2005 14:57 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
wasteh202
Messages: 137 Registered: May 2009
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Master |
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Are the 2Pi Towers equal or simular to what is known as a TL or MLTL ? Thanks
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Re: 2Pi Towers [message #46176 is a reply to message #46173] |
Sat, 22 January 2005 21:12 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
wasteh202
Messages: 137 Registered: May 2009
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Master |
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Wayne Thanks for the reply, and the info about Transmition lines. One thing more. You did not answer my question as to the 2Pi Towers. Are they or are they not TL's. Thanks
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Re: 2Pi Towers [message #46177 is a reply to message #46173] |
Sat, 22 January 2005 21:16 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
wasteh202
Messages: 137 Registered: May 2009
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Master |
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Woops... Sorry, I read the link about TL's after I already responded to your post. I see now where you are telling me that the 2Pi Towers are NOT TL's Thanks Wayne. Take care!
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Re: 2Pi Towers [message #46179 is a reply to message #46177] |
Sat, 22 January 2005 23:51 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) |
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Wayne Parham
Messages: 18752 Registered: January 2001
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Illuminati (33rd Degree) |
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As with most things in acoustics, labels are useful but there's sometimes more than a simple tag line. For example, horns usually act like quarter-wave resonators near their lowest frequency extremes. The line between pipes and horns becomes blurred in the bass. Similarly, quarter-wave pipes aren't immune to acting as Helmholtz resonators if the conditions are right. Bass-reflex speakers may use Helmholtz resonance, but that doesn't prevent standing waves from forming. The laws of physics don't prevent standing waves from existing in a cabinet simply because it is a horn or a bass-reflex speaker, nor do they prevent Helmholtz resonation in a ported quarter-wave pipe. So my point is that sometimes there are more than one of these acoustic properties at work in any kind of loudspeaker. Two π towers are bass-reflex cabinets with Helmholtz resonance tuned to 40Hz. But they are not immune to standing waves along their long axis. Quarter-wave resonance is controlled by stuffing and by the placement of the port and speaker. I would imagine that other similar looking speakers designed to be used as quarter-wave pipes control Helmholtz resonance by using port dimensions that shift the Helmholtz frequency out of the passband or using it to advantage as a secondary acoustic device. But the primary acoustic feature of a two π tower speaker is the Helmholtz resonator of its bass-reflex cabinet.
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