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Message: <blockquote data-quote="Remotia" data-source="post: 2101845" data-attributes="member: 568127">That sub was really designed for small box SPL applications, here are the T/S if you want to try and design a better  box for it.Qts is about 0.17Bl is 45Sd is 0.079 meters squaredSPL is 91dB with 1 watt @ 1 meterCms is about 81Vas is about 60 litersThose numbers are off the top of my head but should be closeThe alignments call for a very small box. You can use passive radiators just find and get linear frequency response with high output. The driver actually wants to live in a ported box but because it is so over motored, it only needs a small box for linear response, hence anything larger will cause a HUGE peak at tuning frequency which is great if you want to do SPL competition. The 4HP's kill the spl competitions all day long for this reason, but for daily driving, you need something FAR more tame. If you want to keep this subwoofer, I would recommend a small sealed box with a lot of power and EQ down low to kick up the output around 25Hz. Ported and passive produce about the same results  relative to one another, however you can more easily get feasible tuning frequencies with passive radiators because they don't depend on port length or area to tuning frequency. Literally, to get the Ti linear in its ideal box would require a port length that would not fit into that box unless you are one darn good wood worker and like to spend time by yourself late at night.You'll likely not find a louder speaker the motor is literally almost twice as powerful as the MTX Jackhammer to give you an idea of why it's so **** hard to tame.Ok here is the system I came up with for you. The trick I used was to EQ to top end to try and match the enormous efficiency spike at tuning frequency.Use a 2 cubic foot box tuned to 28Hz. The port area should be two 4” ports at 30” long. Now you can’t fit two of these in a 2 cubic foot box so what you’ll have to do is use a slot port and wrap it around one or maybe two corners. The slot port length should be also 30” but the area should be 25” squared or the same area as the two 4” ports.Use a high pass filter at 23hz with a Q of 0.707. That will limit the excursion to a bit but with the PEQ we’re going to put up high, you’re still going to get higher excursion above tuning frequency. Here is what you need. At 50hz put a PEQ with a Q of 1.4 with a gain of +6.0dB, and then put a low pass at 80 or 90hz to cut off higher frequencies.The end result will be a very loud sub with only a 2 to 3dB peak at 28Hz. That will be pretty linear and very loud.Good luck!</blockquote>

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