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In the Forum: Horn-Loaded Speakers
In the Thread: Midbass Horns and Real Estate.

Post Subject: Well TH...Posted by Saturntube on: 1/31/2010

Paul, I am no expert on tapped horns but I think the main (40 year old) principle is that you join the back wave of the driver with the front wave, now in order to have the 2 wave fronts meet, the back wave should travel a certain distance depending on the frequency range they should cover. They are good for a range of two octaves, when the back wave meets the front wave, both waves sum at the design frequency, and they annul themselves at the opposite wave length, so say my tapped horn goes down to 30 hz, it means it is designed to meet both waves at 60 hz, they will annul at 120 hz and at 30 hz, so this means they are good from 120 hz down to 30 hz. Some how the drivers barely move (I guess because both sides of the driver are loaded). Mine are about 1.8 meters high and 40 cm X 60 cm foot print, each one takes almost a whole sheet of 3/4" mdf, so they are not light. They use the very heavy Beyma 12LX60 driver, the design is readily available on the Diyaudio huge thread of collaborative Tapped Horn project. I made them as a myth buster scheme, I was using at the time a couple of 12" drivers per side and a 15 inch servo controlled subwoofer per side and I thought they couldnt be beat... I like the TH better. I get bass I never heard before way out of their "optimal range" they are fast and clear and very easy to integrate, I drive them with a pair of 12 watt PP mono tube amps with a Pllxo at 150 hz. My room is 14 ft X 21.5 ft with a height of 9 ft, again, brick and concrete so maybe that helps, they barely vibrate move and the ground starts shaking! The best way to describe them would be explosive! I will take some freq. measurements. I am sure the concrete idea is terrible, here we weld rods all around and pour concrete to everything, we have passed 6 degree earthquakes without a blimp...

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