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I am fascinated by sound-producing devices. Here are some that I have created using AutoCAD. I started out drawing warning sirens, but I am expanding the scope of my creations. Click on the thumbnails for full-sized images. Clicking the "A" button will open an alternate view.
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Speakers and Electronic Sirens
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This 80-inch tall, three-way cabinet is intended for use in theater systems. It contains a 24" electrodynamic woofer, a 5-foot coiled exponential midrange horn, and a 10"x8" tweeter horn. The rear view is shown sans-wires, as I got lazy. The chassis contains three power supplies, one for each field coil.
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Wide range outdoor warning and PA horn system.
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PENDING
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For the audio enthusiast who wishes to enjoy theater sound at home, Doomsday Sound offers the Encore Model One. This is a three-way speaker consisting of an 18" woofer, a midrange horn, and a tweeter horn. The midrange and tweeter use the same drivers that are found in Doomsday Sound's top theater systems, such as the Encore Four-Twelve. The cabinet measures 48" wide, 32" tall, and 20" deep, excluding the legs.
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The Encore 331 is the professional equivalent of the Model One. In addition to the difference in driver layout, the 331 comes in the "Theater Black" stain and includes a metal grill, two casters, and handles for moving. The grill peg holes are the same as on the Model One, so the Model One grill may be used if a less utilitarian look is desired.
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This is the Encore Model Two. It is intended for home hi-fi or as a professional studio monitor. The Model Two is a two-way system using two 10" woofers and a horn tweeter with an acoustic lense. Cabinet dimensions are 24" x 24" x 16". The alternate views show the grill on as well as the grill off with acoustic lense removed.
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The Encore Model Three is a three-way system intended as a high quality shelf speaker or a near field studio monitor. It uses a 10" woofer, a 5" midrange, and a 1.5" dome tweeter. Cabinet dimensions are 22.5" x 17.5" x 12.5".
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Single-Toned Sirens
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This is my first color render in AutoCAD 2002, and the siren is of a very simple design. The rotor measures 8" across. I have cut away a portion of the housing to show you the insides.
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Here's my first attempt at making a stator with beveled edges on the ports. I think it turned out nicely! There are screw holes in the stator for the mounting of horns. This particular siren has a 10" rotor.
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A discussion about hearing damage caused by vehicle sirens came up on the airraidsirens.com board. One member suggested an Allertor-like siren to project the sound forward. Here is my version of it. The projector is designed to disperse sound to the sides as well. This siren has a 10" rotor.
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I've created a monster! This siren uses two 36-inch, 16-port rotors inside 48-inch stators. This one would probably be mounted on a very tall building, or "Chrysler siren style" on a tower. A roof would be built over it to keep rain and snow out.
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This is a small, blower-assisted, omnidirectional siren. Air from a blower enters the silver pipe and is forced through the horizontally-mounted chopper assembly, and up into the horn section where it is dispersed in a 360-degree pattern. The horn section is 24 inches in diameter.
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After taking a break from sirens, I had a dream that inspired this one. The stator measures four feet wide, and the entire siren is about six feet tall, not including I-beams. The independently operated dampers on each port are mainly for show at this point, as I don't know what useful function they'd serve, other than an elaborate way to enable coded signals. The siren in my dream had them, so I added them here. This is also my first use of textures other than what AutoCAD provides, along with accurate lighting effects.
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The CAD file for this siren was lost due to an ID-10T error resulting in a hard drive crash back in 2005. I am providing the only image that I have of it. This strange siren uses a single motor to power both the rotor and the Roots blower. The specs have since been forgotten, but I do recall that the rotor in this beast is 24" diameter.
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Dual-Toned Sirens
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The Thundercane 1003 is a cross between a Federal Thunderbolt and an ACA Hurricane. The entire siren is massive! You do not want to be near this thing when it goes off.
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This siren is a cross between the WWII Carter and the 2T22. It has a 10/12 port ratio and 15" rotors. The entire siren is nearly three feet long. There is the option of mounting horns on this one when installed vertically.
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Here is an improved version of one of my first crazy sirens. This siren took quite a while to produce! The horn section by itself is 100 inches long.
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This siren is a modification of my 10/12 port Carter-like siren. It has dampers to produce coded signals if desired. I have cut away a portion of the housing to show you the innards. Housing dimensions: 57" tall, 34" diameter.
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This is a small steam siren with a six-inch rotor. Steam to the turbine that spins the rotor enters through the threaded pipe, and the steam to the rotor enters through the large vent. I have added an exploded view showing the insides of the siren.
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Other Noise Makers
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What? That's not a siren! It's a vibratory horn driver. It's fairly small; that's a half-inch bolt through the center. Since it must also conduct electricity well, the diaphragm is copper plated iron.
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