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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: 208463" data-attributes="member: 652"><p>There was a double 18" sub included in the measurement ... sorry I forgot to mention that <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />. The double 14 was crossed at 80 Hz and then at 630 Hz. In both cases its acoustically a 24 dB LR function/slope. The 80 Hz crossover is a 12 dB natural acoustic roll off EQ-ed to a 12 dB Butterworth shape combined with a 12 dB Butterworth electrical filter to produce a 24 dB LR roll off.</p><p></p><p>The 630 Hz is linear phase and there is quite a bit of phase manipulation with all-pass filters to get the end result.</p><p></p><p>Peter</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 208463, member: 652"] There was a double 18" sub included in the measurement ... sorry I forgot to mention that :-). The double 14 was crossed at 80 Hz and then at 630 Hz. In both cases its acoustically a 24 dB LR function/slope. The 80 Hz crossover is a 12 dB natural acoustic roll off EQ-ed to a 12 dB Butterworth shape combined with a 12 dB Butterworth electrical filter to produce a 24 dB LR roll off. The 630 Hz is linear phase and there is quite a bit of phase manipulation with all-pass filters to get the end result. Peter [/QUOTE]
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New DIY Mid High (90deg) - AKA PM90
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