Sound and Volume Background

We must begin by defining what volume means exactly. Volume is measure on the decibel scale of sound pressure level. (SPL) This is a logarithmic scale whereby the acoustic energy doubles for every 3dB increase in volume. The human ear attenuates so it is not good at measuring volume. Also to be considered is the frequency: lower frequencies carry further. Also, alternating tones are more noticeable to humans, which is why ambulances and other signaling applications employ sweeping, or beeping tones. Super technical discussion here.

Ultra Loud Buzzer Tests

Our standard piezo buzzer has an SPL (sound pressure level) rating of 103dB at 2 feet distance. This is comparable to a smoke alarm. However, since our products oftn go into really noisy factories, we occasionally have been asked for even louder options. So we have responded by offering what we call our “ultra loud” buzzers.

This buzzer known as model SP-1316. It is louder than our standard buzzer by 8 dB, and at lower frequency! If our standard buzzer was known as a “very loud” buzzer, then the only name that makes sense for the SP-1316 is to call it an ultra loud buzzer. Bench testing of the SP-1316 buzzer shows that it not only increases the SPL from 103dB to 111db, but also produces this volume at a lower frequency which carries further. This feature make is comparable to our “siren buzzer”.

A word about our “siren buzzer”: it produces an SPL of 118dB at 2 ft which is extremely loud. However, it does not have a stainless steel diaphragm, and so will at risk of corrosion when used on a plating line. Also, the siren buzzer has a diameter of 50 mm [2″] which requires a larger enclosure. Finally, it does not have a threaded nut to allow easy mounting through the walls of our enclosures.

The SP-1316 is available by special order. Please contact our sales.