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Low Earth Orbit
DIY Audio
PM 60 & 90 settings and alternative drivers.
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<blockquote data-quote="Peter Morris" data-source="post: 212399" data-attributes="member: 652"><p>A couple of comments about the PM90/60 design</p><ul> <li data-xf-list-type="ul">The PM90/60 is designed to be pole mounted and produce extreme SPL and sound quality – as such there are some compromises; its complicated to build and process and the drivers are expensive.</li> <li data-xf-list-type="ul">Its only designed to be used above 100Hz.</li> <li data-xf-list-type="ul">All the drivers (MF, HF & VHF) operate in their piston range</li> <li data-xf-list-type="ul">Because of the bent mid horn, the mids should not operate above about 750Hz</li> <li data-xf-list-type="ul">The mids are not designed to be flat without significant DSP correction.</li> <li data-xf-list-type="ul">Because the 12” drivers are operating in their piston range you can correct their response with a DSP and they will still sound good.</li> <li data-xf-list-type="ul">The choice of the BMS4594 other than sound quality was its ability to operate at the very low crossover frequency needed. This is what limits the number of other suitable compression drivers and horns.</li> </ul></blockquote><p></p>
[QUOTE="Peter Morris, post: 212399, member: 652"] A couple of comments about the PM90/60 design [LIST] [*]The PM90/60 is designed to be pole mounted and produce extreme SPL and sound quality – as such there are some compromises; its complicated to build and process and the drivers are expensive. [*]Its only designed to be used above 100Hz. [*]All the drivers (MF, HF & VHF) operate in their piston range [*]Because of the bent mid horn, the mids should not operate above about 750Hz [*]The mids are not designed to be flat without significant DSP correction. [*]Because the 12” drivers are operating in their piston range you can correct their response with a DSP and they will still sound good. [*]The choice of the BMS4594 other than sound quality was its ability to operate at the very low crossover frequency needed. This is what limits the number of other suitable compression drivers and horns. [/LIST] [/QUOTE]
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