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Low Earth Orbit
DIY Audio
New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Peter Morris" data-source="post: 137686" data-attributes="member: 652"><p>Re: New DIY Mid High</p><p></p><p></p><p>Here are some plots at the speakers rated power -</p><p></p><p>Top left - 18sound 12ND830 - 450W</p><p>Top right - 18sound 12ND930 - 500W</p><p>bottom B&C 12NDL76 - 400W</p><p></p><p><em>Light grey trace - RCF MB12N351 - 650W - at the same input level they all have almost identical efficiencies. </em></p><p><em></em></p><p>I have also included some hornresp calculations for the RCF - not sure if this is exactly what the production model ended up as - Its close - I varied some of the parameters to check it would still work if the box or driver was slightly different, or if my guess for the parameters I did not have would matter.</p><p></p><p>Basically its a 600mm long exponential horn with a 2.9 : 1 compression ratio.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 137686, member: 652"] Re: New DIY Mid High Here are some plots at the speakers rated power - Top left - 18sound 12ND830 - 450W Top right - 18sound 12ND930 - 500W bottom B&C 12NDL76 - 400W [I]Light grey trace - RCF MB12N351 - 650W - at the same input level they all have almost identical efficiencies. [/I] I have also included some hornresp calculations for the RCF - not sure if this is exactly what the production model ended up as - Its close - I varied some of the parameters to check it would still work if the box or driver was slightly different, or if my guess for the parameters I did not have would matter. Basically its a 600mm long exponential horn with a 2.9 : 1 compression ratio. [/QUOTE]
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New DIY Mid High (90deg) - AKA PM90
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