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Low Earth Orbit
DIY Audio
Double 10 and Horn
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<blockquote data-quote="Peter Morris" data-source="post: 213412" data-attributes="member: 652"><p>Hi Grant,</p><p></p><p>One of the limiting factors with a compression driver is Xmax at the lower frequencies. A 4" diaphragm has 177% more cone (diaphragm) area than a 3" and can therefore produce more SPL especially at the lower frequencies we are talking about.</p><p></p><p>Normally a 3" diaphragm has better VHF performance, but in this case (RCF 850/840 Vs 950/940) the 4" diaphragm seems just as good if not a little better.</p><p></p><p>The double 10 design we are talking about has quite reasonable SPL capabilites, probably a bit more an RCF TT5a, TT4a etc.</p><p></p><p>I have not measured the ND840 or ND950 so I'm guided by what RCF are doing with the speakers above which all use a variant of the ND950, only the TT2a, 22a use a 3" diaphragm driver like the ND840. The double 10 is noticably more powerful than these 12' speakers.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 213412, member: 652"] Hi Grant, One of the limiting factors with a compression driver is Xmax at the lower frequencies. A 4" diaphragm has 177% more cone (diaphragm) area than a 3" and can therefore produce more SPL especially at the lower frequencies we are talking about. Normally a 3" diaphragm has better VHF performance, but in this case (RCF 850/840 Vs 950/940) the 4" diaphragm seems just as good if not a little better. The double 10 design we are talking about has quite reasonable SPL capabilites, probably a bit more an RCF TT5a, TT4a etc. I have not measured the ND840 or ND950 so I'm guided by what RCF are doing with the speakers above which all use a variant of the ND950, only the TT2a, 22a use a 3" diaphragm driver like the ND840. The double 10 is noticably more powerful than these 12' speakers. [/QUOTE]
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