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Low Earth Orbit
DIY Audio
PMA - 60; New arrayable double 12 and horn.
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<blockquote data-quote="Peter Morris" data-source="post: 214360" data-attributes="member: 652"><p>Yes the port velocity is a bit high, but the port is tapered with a large inlet so the air flow resistance is not as high as a "normal" straight port of that size. It also acts as a brace to strengthen the box without adding weight. In addition it exits at the back of the box so any noise from the port, or off of the rear of the speaker cone is reduced.</p><p></p><p>One of the aims of this design was to make it as small as possible - the same size as my double 10 if possible. To do that the horn actually overlaps the the 2 x 12" drivers. The 12's and horn even share the same mounting bolt hole at one point. It also minimizes the distance between the drivers to reduce any comb filtering and directivity problems.</p><p></p><p>Phase matching with my double 18's was not an issue as I can adjust it with all-pass filter or FIR filters as needed.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 214360, member: 652"] Yes the port velocity is a bit high, but the port is tapered with a large inlet so the air flow resistance is not as high as a "normal" straight port of that size. It also acts as a brace to strengthen the box without adding weight. In addition it exits at the back of the box so any noise from the port, or off of the rear of the speaker cone is reduced. One of the aims of this design was to make it as small as possible - the same size as my double 10 if possible. To do that the horn actually overlaps the the 2 x 12" drivers. The 12's and horn even share the same mounting bolt hole at one point. It also minimizes the distance between the drivers to reduce any comb filtering and directivity problems. Phase matching with my double 18's was not an issue as I can adjust it with all-pass filter or FIR filters as needed. [/QUOTE]
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PMA - 60; New arrayable double 12 and horn.
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