John Huntington and his friends decided to test the reported phenomenon of infrasound (very low-frequency sounds) causing people to feel spooky chills and thrills, a phenomenon blamed for ghost sightings and reports of hauntings. They created a spook-house with a double-blind randomized infrasound generator and used surveys to check for a correlation between infrasound and creepy feelings. John exhaustively documented the experimental setup (and the setbacks encountered in getting things up and running), and the results. Spoiler alert: they didn't find a correlation.
We picked a 19 Hertz (Hz, or cycles per second) sine wave as our infrasound source, since that's the frequency Tandy and Lawrence had found in their initial investigation of a "haunted" space (see Part I of this series for details). For our initial tests last spring, we used an Audio Toolbox as our signal generator, and connected it up to our ancient Apogee P-10 subwoofer processor and a Crown K2 amp, which drove an Apogee AE-10 double 18" subwoofer (these units work just fine, but haven't been made in years.) We got the sound going, but after a minute or so, it would cut out. I figured out that the processor was apparently protecting the subs against the "bad" infrasound, and was cutting out. So, I bypassed the processor and its protection circuits, and (carefully) drove the subwoofers directly from the amp. This worked just fine, but I was a bit concerned about damaging the speakers themselves. Fortuitously, over the summer I managed to get for our department a massive, modern Meyer Sound 650-P powered subwoofer. And after some tests in late summer we determined that the unit could generate quite a bit of 19Hz without clipping, and we figured the level was pretty good because by the time we pushed the 650-P up to its limits, the effects of the infrasound would be obvious to anyone in the room, which wouldn't have been acceptable for our purposes.
Mathematician Stephen Wolfram and his company do a lot of consulting for Hollywood. But he doesn’t often do it on an urgent basis because a movie is about to shoot and they neglected to “tech the tech.” When I first started looking at the script for [Arrival], I quickly realized that to make coherent suggestions […]
Can you “hear” motion or light flashes? If so, according to new research from City University London, you may be experiencing a not-so-rare form of synaesthesia. Synesthesia is the fascinating neurological phenomenon whereby stimulation of one sense involuntarily triggers another sensory pathway. For example, a synesthete might taste sounds or hear colors. (In this study, […]
Scientists declared the ruby seadragon a new species in 2015, but that was based on dead specimens in a museum. Now though, Scripps Institution of Oceanography biologist Greg Rouse who led the team that originally discovered the species, managed to find two of the wonderful fish swimming around the Recherche Archipelago, off the south coast […]
You know as well as I that writing complex, long-long form text requires significant organization. You’re probably also well aware that Word just isn’t up to the task. That’s why I’m a huge fan of Scrivener, the software suite used by best-selling authors and technical writers alike.Scrivener is much more than another digital typewriter. With a […]
Looking to upgrade your weekend? Here are three randomly awesome products on my mind this week.#3 FRESHeBUDS Pro Magnetic Bluetooth EarbudsAs more and more phones and gadgets switch to Bluetooth-only compatibility, you’ll need to get Bluetooth headphones like the rest of us. I’ve been super impressed with these affordable magnetic headphones. Pull the magnetic earbuds apart to auto-connect […]
Traditional folding wallets are designed for paper bills—but these days, carrying cash is rarely a necessity. More often than not, I don’t carry cash at all. This Bogui Clik Wallet is the best answer I’ve found for avoiding the hassle of those tight-fitting credit card pockets.This attractive, minimalist wallet features a protective lip, so my cards don’t […]