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Low Earth Orbit
DIY Audio
FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems
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<blockquote data-quote="Mike Smith" data-source="post: 16208" data-attributes="member: 152"><p>Re: FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems</p><p></p><p></p><p></p><p>Jeff,</p><p></p><p>Regarding conventional bass reflex designs: box volume is box volume is box volume. The speaker enclosure's shape (within reason) should not affect its tuning or output. The goal is to match the driver's electro-mechanical compliance to the internal air load's compliance and then tune THOSE mutually interactive factors to suit your performance objectives.</p><p></p><p>The reference to internal resonance modes brings to mind the contribution a carefully crafted violin body makes to tone, or the ringing of a glass filled with just this much water. If a PA box has internal resonance modes of any kind, it is probably better to repurpose that box as firewood. A contemporary, well-built PA box -- mid/high or sub -- should be as acoustically inert as possible. Mid/high boxes can benefit from asymmetrically-reflecting walls (trapezoidal), appropriate damping materials, and of course good construction. Sub boxes simply need to be airtight (except for the port, obviously) and really well braced. Art or Ivan could explain it better than I am able.</p><p></p><p>Or maybe I completely misunderstood you. It's been that kind of day today. </p><p></p><p>As far as stacking high boxes on subs is concerned, yes, a single block of subs will usually perform better than split sources, but from a practical point of view you sometimes just have to deploy the classic dual-stack high-box-high/low-box-low and just get on with it.</p><p></p><p>Thanks for getting this great new DIY resource up and running.</p></blockquote><p></p>
[QUOTE="Mike Smith, post: 16208, member: 152"] Re: FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems Jeff, Regarding conventional bass reflex designs: box volume is box volume is box volume. The speaker enclosure's shape (within reason) should not affect its tuning or output. The goal is to match the driver's electro-mechanical compliance to the internal air load's compliance and then tune THOSE mutually interactive factors to suit your performance objectives. The reference to internal resonance modes brings to mind the contribution a carefully crafted violin body makes to tone, or the ringing of a glass filled with just this much water. If a PA box has internal resonance modes of any kind, it is probably better to repurpose that box as firewood. A contemporary, well-built PA box -- mid/high or sub -- should be as acoustically inert as possible. Mid/high boxes can benefit from asymmetrically-reflecting walls (trapezoidal), appropriate damping materials, and of course good construction. Sub boxes simply need to be airtight (except for the port, obviously) and really well braced. Art or Ivan could explain it better than I am able. Or maybe I completely misunderstood you. It's been that kind of day today. As far as stacking high boxes on subs is concerned, yes, a single block of subs will usually perform better than split sources, but from a practical point of view you sometimes just have to deploy the classic dual-stack high-box-high/low-box-low and just get on with it. Thanks for getting this great new DIY resource up and running. [/QUOTE]
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FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems
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