Question

How to make a full convertible hit hard

So I have a 2001 Jeep Wrangler hardtop convertible that I’m trying to build a box for that would sound good with the top off. My customer wants to go ported but as soon as we remove the top the bass is gone. Is there a certain way I should be facing both the subwoofer and the port? I currently have the sub down and port down and it sounds extraordinary when the top is on! I’m running a Soundqubed HDS 3.110 inch sub At 1.5 ft.³ internal volume after displacements ported at 34 Hz and a port area of 24 Square inches. Anybody have any suggestions?

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ghost drive it in to a wall with all the high end equipment you can put in a Cheap Wrangler at 60mph. It'll hit hard then. Ha! 

The reason why is there almost no bass is because if the roof is on, there is cabin gain, if the roof is off, there is no cabin gain. So if you want to make some bass without the roof, you need a driver with huge X-max which can work well in a big net volume box tuned somewhere between 20-25 Hz like for example the box I've designed for the for the GZNW 12XMAX woofer: Box for Ground Zero GZNW 12XMAX (speakerboxlite.com) . Here on SBL on the Graphs tab the cabin gain is basically the interior transfer function (the car icon). Turn it on, and you will see the difference between the "roof on" and the "roof off" situation.

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