For these motors, are you trying to get new motors or used ones? Ebay has a pretty decent selection of used motors, and I'd bet there are also industrial salvage shops that have large and high horsepower pre-owned motors in stock. Do a bit of research about NEMA frame codes, because that is the desi...

For those interested in getting a video, it looks like there's a Tyfonic siren in Batesville at the intersection of Harrison St and N St Louis Street, where northbound AR-69 turns east. There is a Walgreens on that corner, and the Tyfonic is on that corner of the intersection. I found it almost righ...

Any chance of getting a video of an Ultra-Hyperspike speaker in action?

Here is another similar product to the Motorola sirens, from a company (I've never heard of before now) called Genave:

http://genave.com/wp-content/uploads/20 ... 090R06.pdf

Before now, I haven't had a chance to get a good look at these speakers aside from the images that were already online, which didn't show any details of what was behind the grilles. I once met Ben Cooper of USSI, and asked him about these speakers, but he was tight-lipped on specifics (as he ought t...

So here's some more information on the blower. Paxton Products (Santa Monica, CA) is a manufacturer of centrifugal superchargers and industrial blowers based upon the same. Their blowers are commonly used in place of roots-type blowers for pneumatic conveying and process air where lower pressures bu...

Here's another, a shelter-in-place announcement for a school or college campus building in case of a lockdown situation. http://www.taterworks.com/www/music/SIP_Male_V2.mp3 This one sounds kind of creepy and eerily realistic when played through my Atlas Soundolier VT-157 voice/tone speaker (also sol...

This is for all the fire alarm fans. In my boredom tonight, I created an audio file that can be used with electronic fire alarms (which are basically PA horns with strobes) that contains a multilingual message. The English message repeats, followed by a Spanish message, followed by the English messa...

Man oh man...the voice is so annoying. Some announcers think that "speak slow" means "speak normally, but use an awkwardly long gap between words". It is better to speak at a normal rate with careful enunciation and with normal inflection and repeat the announcement twice rather ...

Use 8 ohm or 16 ohm PA horn drivers from Atlas Sound or similar - do not use pro-audio compression HF drivers. Also, do not use 70/100V drivers. Wire the horn drivers so that they present a net impedance of between 4 and 8 ohms. For drivers connected in series, the impedances of each driver add toge...