To hear my conch, click here! I'm using sub-par recording software; it can't capture the true richness of the sound, so you'll have to make one and hear for yourself. And make no mistake, this is LOUD, and is in fact an approved U.S. Coast Guard noise signaling device.
How To Make a Conch Horn
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Step 1: The Materials
~One Conch Shell
If you live by the Carribean, you can find them on beaches or dive for them. If you live on any coastline, there is probably an analogous species you can use. For example - if you live in Massachusetts, you can use a Whelk. If you don't have access to the ocean, you can buy one online or at some antique stores and flea markets. Anything from around 6" and up will be fine, size doesn't impact loudness, though can impact pitch (larger = deeper).
~Pick one: Hacksaw, Sawzall with metal-cutting blade, Rock, Chisel and Hammer
~Nail or Center Punch
~Sandpaper or File