Can anyone direct me to a speaker/tweeter/transducer that operates well in the 20KHz to 60KHz frequency bandwidth? I know this is beyond human hearing range.
I looked at some piezoelectronics but the ones I saw cut off at this bandwidth, or no frequency specs were provided.
Something capable of 120dB would be ideal.
I looked at some piezoelectronics but the ones I saw cut off at this bandwidth, or no frequency specs were provided.
Something capable of 120dB would be ideal.
TECHNICS 10th800
The 10TH400s show up on ebay Germany quite often.
Pioneer TS-ST910 are available in Japan
Rgds
James
The 10TH400s show up on ebay Germany quite often.
Pioneer TS-ST910 are available in Japan
Rgds
James
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Delivering that frequency range at high-decibel levels is pretty demanding of the requested driver. The Aurem Cantus G1 Ribbon Tweeter has a specified bandwidth of 900Hz-40,000Hz at 102.0 dB 2.83V/1m. The tweeter is rated for 100 watts RMS/140 watts max, so you can add 20dB to the baseline sensitivity, resulting a 122dB at 1-meter with 100-watt RMS input.
So, with the Aurem Cantus G1 Ribbon Tweeter, you could get to 40KHz at 122db at 1-meter with 100-watts RMS input power.
So, with the Aurem Cantus G1 Ribbon Tweeter, you could get to 40KHz at 122db at 1-meter with 100-watts RMS input power.
Esl's can get up that high !!
I used to point my little 3.25" X 9.75" panel out the window to irritate the neighbors barking dogs and they would shut up every time I turned it on.
Then they would start aimlessly looking around when a swept the frequency randomly up and down. Ahhh,ha,ha,ha,ha,ha !!!!
I don't remember how high I was able to measure it as my amplifier couldn't get much higher than about 50khz or 60khz.
I didn't have an SPL meter at the time, but I did confirm that it was working using a microphone connected to my scope.
I believe that ESL technologies are used for the military apps that are very very powerful systems.
jer
I used to point my little 3.25" X 9.75" panel out the window to irritate the neighbors barking dogs and they would shut up every time I turned it on.
Then they would start aimlessly looking around when a swept the frequency randomly up and down. Ahhh,ha,ha,ha,ha,ha !!!!
I don't remember how high I was able to measure it as my amplifier couldn't get much higher than about 50khz or 60khz.
I didn't have an SPL meter at the time, but I did confirm that it was working using a microphone connected to my scope.
I believe that ESL technologies are used for the military apps that are very very powerful systems.
jer
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It's certainly true that in the 20KHz-60KHz frequency range, the driver's are going to be quite directional in nature; the horizontal/vertical dispersion patterns will be very restricted. So, you'll need to aim the drivers at your target locations; otherwise, the fall-off in projected audio-frequency response will be fairly dramatic.
But, you knew that, right?
This won't get you 120dB, but here's another option for wide bandwidth ultrasonic transducers: Piezo Film Transducer - PVDF Fluoropolymer - Vibra Tabs 50mV/g - Audio Sensor | eBay
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