The Paper Horn by Inlow Sound
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Diy JBL 2240 60hz dual throat midbass conical horn

Yes, the title of this page pretty much says it all. In my quest for that perfect midbass horn, I stumbled across this design. I was playing around with Hornresp the other day, and knowing that I have 4 JBL 2240 drivers, I wondered just how much performance I could get from them. To make matters more interesting, I wanted to design a horn that required the absolute least amount of fabrication effort. One way to ease the process is to remove curved flares. This means I'd need to utilize a conical horn approach. I've never taken the conical horn too seriously--today, I think this mouse may be a beast lurking in the bushes. 
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As you can see, this design has simplicity by the bucket loads. I can't wait to get some sawdust flying.
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I ran a simulation with two JBL 2240s in parallel, and 2.83 volts input. If this performance graph is any indication of a conical horn's power and efficiency, then I'm in for one beautiful ride! My little DIY class A amp's output should be more than adequate when it comes to my brain achieving a state of suspended disbelief and that quasi-delirium we audiophiles seek.

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    JBL 60 Mid Bass Horn

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