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Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
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<blockquote data-quote="Peter Morris" data-source="post: 206044" data-attributes="member: 652"><p>Hi Jim,</p><p></p><p>A 24 dB per octave Linkwitz–Riley filter is constructed by cascading two second order (12dB) Butterworth filters.</p><p></p><p>In this case there are two ways to achieve this; EQ the box flat for a reasonable (not too far) distance below the crossover frequency and then apply a standard 24dB LR, or use a 12 dB Butterworth and a little EQ until the end result matches perfectly a 24dB LR roll off.</p><p></p><p>In this case the natural roll off of the box plus a 12dB filter at about 100Hz gets very close. I think this is probably a better solution.</p><p></p><p>Thanks for raising this point <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 206044, member: 652"] Hi Jim, A 24 dB per octave Linkwitz–Riley filter is constructed by cascading two second order (12dB) Butterworth filters. In this case there are two ways to achieve this; EQ the box flat for a reasonable (not too far) distance below the crossover frequency and then apply a standard 24dB LR, or use a 12 dB Butterworth and a little EQ until the end result matches perfectly a 24dB LR roll off. In this case the natural roll off of the box plus a 12dB filter at about 100Hz gets very close. I think this is probably a better solution. Thanks for raising this point :-) [/QUOTE]
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60 Degree DIY Mid Hi - AKA PM60
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