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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: 214675" data-attributes="member: 652"><p>Here is a rough sketch of the plans for the PMA60 (have to reload sketch up) - There are a couple of things to note;</p><p> </p><p>1) To minimize its size and keep the 2 x 12" speakers as close as possible to each other, the horn flare covers part of the 12" driver and shares one bolt / screw hole. (see earlier pictures). </p><p>2) The material I used was 16mm ply</p><p>3) The rear port also serves as a handle or grab point, so there is a small lip at the top of the port to help.</p><p>4) When arraying two boxes the DSP settings can be modified with a couple of filters - a 5 to 6 dB shelving filter to adjust the coupling of the 12's and a PEQ to adjust the coupling of the horn at its lower operating range,</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 214675, member: 652"] Here is a rough sketch of the plans for the PMA60 (have to reload sketch up) - There are a couple of things to note; 1) To minimize its size and keep the 2 x 12" speakers as close as possible to each other, the horn flare covers part of the 12" driver and shares one bolt / screw hole. (see earlier pictures). 2) The material I used was 16mm ply 3) The rear port also serves as a handle or grab point, so there is a small lip at the top of the port to help. 4) When arraying two boxes the DSP settings can be modified with a couple of filters - a 5 to 6 dB shelving filter to adjust the coupling of the 12's and a PEQ to adjust the coupling of the horn at its lower operating range, [/QUOTE]
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PMA - 60; New arrayable double 12 and horn.
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