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Questions about PA cabinet concepts
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<blockquote data-quote="David Morison" data-source="post: 214973" data-attributes="member: 2076"><p>The PM60/90 designs use horn loading rather than having the drivers radiate directly.</p><p>This has the effect of working a bit like a transformer (or gearbox if you prefer that analogy) to make them more efficient, which is why the projected max SPL's mentioned in Peter's threads are higher than the 131 you've calculated. IIRC the difference is in the order of 6-8dB for the 12" low mid section, equivalent to having at least double the number of direct radiating drivers.</p><p>HTH,</p><p>David.</p></blockquote><p></p>
[QUOTE="David Morison, post: 214973, member: 2076"] The PM60/90 designs use horn loading rather than having the drivers radiate directly. This has the effect of working a bit like a transformer (or gearbox if you prefer that analogy) to make them more efficient, which is why the projected max SPL's mentioned in Peter's threads are higher than the 131 you've calculated. IIRC the difference is in the order of 6-8dB for the 12" low mid section, equivalent to having at least double the number of direct radiating drivers. HTH, David. [/QUOTE]
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