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<blockquote data-quote="hispls" data-source="post: 8402698" data-attributes="member: 614752">Everything else being equal they will definitely get louder probably up to about 8 cube each where you start hitting a plateau where you gain little for more volume.That said, how many variables could make you LOSE?Port is no longer the optimum distance from whatever wall it fires intoimpedance rises slightly at your peak and you lose 25% of your amp output.the larger box otherwise interferes with the standing wave you&#039;re building up.One local guy gained over a full dB by merely inverting some 18&#039;s that were in too-small box up my way, though you might just lose because of other variables.&nbsp;&nbsp; Inverting the pair should add close to a cube to your overall box volumeDo you own an SPL meter?&nbsp; &nbsp; Have you tried the &quot;free&quot; and otherwise cheap methods to gain?&nbsp;&nbsp; There&#039;s likely a full dB that you can find for free if you have enough time and a few bucks for some odds and ends.<a href="http://www.stevemeadedesigns.com/board/topic/98191-spl-gains-updates-page-30-routing-the-port/" target="_blank">http://www.stevemeadedesigns.com/board/topic/98191-spl-gains-updates-page-30-routing-the-port/</a>^^^ this thread is the only reason I signed up for SMD board.&nbsp; It is very good.Take lots of notes, measure everything and test everything.</blockquote>

[QUOTE="hispls, post: 8402698, member: 614752"] Everything else being equal they will definitely get louder probably up to about 8 cube each where you start hitting a plateau where you gain little for more volume. That said, how many variables could make you LOSE? Port is no longer the optimum distance from whatever wall it fires into impedance rises slightly at your peak and you lose 25% of your amp output. the larger box otherwise interferes with the standing wave you're building up. One local guy gained over a full dB by merely inverting some 18's that were in too-small box up my way, though you might just lose because of other variables. Inverting the pair should add close to a cube to your overall box volume Do you own an SPL meter? Have you tried the "free" and otherwise cheap methods to gain? There's likely a full dB that you can find for free if you have enough time and a few bucks for some odds and ends. [URL="http://www.stevemeadedesigns.com/board/topic/98191-spl-gains-updates-page-30-routing-the-port/"]http://www.stevemeadedesigns.com/board/topic/98191-spl-gains-updates-page-30-routing-the-port/[/URL] ^^^ this thread is the only reason I signed up for SMD board. It is very good. Take lots of notes, measure everything and test everything. [/QUOTE]

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