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<blockquote data-quote="Canaan" data-source="post: 8241603" data-attributes="member: 566706">I know this port looks HUGE, but it was actually 196sq inches of port area for at 14.5cuft (net) box.So the port area per cubic foot was just 13.5sq/cuft.!!!But, this is a 4-DD 515 build with only 1500wrms.&nbsp; Port noise will NEVER HAPPEN at that level of cone displacement.The actual &#039;on paper&#039; numbers for this build were ~14.5cuft @ 38hz.&nbsp; But &#039;in-cabin&#039; tuning changes alot with big box builds, and I accounted for that change in my design (port firing into the back hatch and the distance to the listening position)This box build is heavily braced...and I offered the owner the chance to replace the subs, add batts, alts, and a second DD M1c....to get louder.I just have to say, the owner of this vehicle was stunned after hearing what he had purchased.I wish I had taken a vid of his reaction....if the owner drops by soon, I will video his review for this install.also...round ports are more efficient.Slot-vents are ok, but a round vent is the most efficient vent (for tuning).</blockquote>

[QUOTE="Canaan, post: 8241603, member: 566706"] I know this port looks HUGE, but it was actually 196sq inches of port area for at 14.5cuft (net) box. So the port area per cubic foot was just 13.5sq/cuft.!!! But, this is a 4-DD 515 build with only 1500wrms. Port noise will NEVER HAPPEN at that level of cone displacement. The actual 'on paper' numbers for this build were ~14.5cuft @ 38hz. But 'in-cabin' tuning changes alot with big box builds, and I accounted for that change in my design (port firing into the back hatch and the distance to the listening position) This box build is heavily braced...and I offered the owner the chance to replace the subs, add batts, alts, and a second DD M1c....to get louder. I just have to say, the owner of this vehicle was stunned after hearing what he had purchased. I wish I had taken a vid of his reaction....if the owner drops by soon, I will video his review for this install. also...round ports are more efficient. Slot-vents are ok, but a round vent is the most efficient vent (for tuning). [/QUOTE]

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