It appears you are describing 'pitch' as a certain waveshape, but not as the frequency of the opening and closing of the ports over an interval of time. Frequency expressed in Hz is the number of times each second the ports cycle from open to closed again. Pitch is separate from "Timbre" w...

From an engineering perspective, first we have to define what is 'audible'. Sirens produce a single or dual continuous tone that may be detectable down to the threshold of the ambient noise. Because it's a steady tone, and has a narrow bandwidth, it may not need to be much louder than the background...

It was due to my personal web space not being https, and some browsers default to require all connections to be https nowadays. SSL certificate purchased, certification 'authorities' got their money, now you can see the photos.

It may be due to them being PNG format, maybe some browsers don't like it. I'll try converting to JPG format.

I went back to the former P-50 site and took these photos of the new T-135 siren: http://www.taterworks.com/www/images/P50/T135_01.png http://www.taterworks.com/www/images/P50/T135_02.png http://www.taterworks.com/www/images/P50/T135_03.png http://www.taterworks.com/www/images/P50/T135_04.png http:/...

Images from the Schaumburg P-50 removal: http://www.taterworks.com/www/images/P50/P50_01.png http://www.taterworks.com/www/images/P50/P50_02.png http://www.taterworks.com/www/images/P50/P50_03.png http://www.taterworks.com/www/images/P50/P50_04.png http://www.taterworks.com/www/images/P50/P50_05.png...

Through a stroke of unbelievable serendipity, I was in Schaumburg IL for a hi-fi audio convention, and the route from my hotel to the convention video takes me along Remington Road, from which the Tower Rd Schaumburg ACA P-50 can be seen along National Blvd. This morning as I was headed to the event...

This patented design actually presents significant acoustical challenges. A plurality of compression drivers are shown radiating into a disc shaped chamber, but the wave expansion is not smoothly and seamlessly preserved from each of the compression drivers, which will reduce the efficiency of the h...

Where did the photos go?

Welcome, and I look forward to seeing your photos. Any HLS systems nearby you?