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Old 14th May 2012, 04:07 PM   #1
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Default ultrasound speaker ( > 20KHz)

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.
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Old 14th May 2012, 05:07 PM   #2
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Possibly ionovac-type drivers

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Old 14th May 2012, 05:51 PM   #3
tvi is offline tvi  Australia
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Last edited by tvi; 14th May 2012 at 06:07 PM.
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Old 14th May 2012, 07:14 PM   #4
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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.
Aurum Cantus G1 Ribbon Tweeter 276-420
So, with the Aurem Cantus G1 Ribbon Tweeter, you could get to 40KHz at 122db at 1-meter with 100-watts RMS input power.
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Old 14th May 2012, 08:14 PM   #5
jcx is offline jcx  United States
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but if you move up/down, L/R a meter? - likely >20 dB drops/roughness from beaming at those frequencies
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Old 14th May 2012, 09:32 PM   #6
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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.


Last edited by geraldfryjr; 14th May 2012 at 09:35 PM.
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Old 14th May 2012, 10:45 PM   #7
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Originally Posted by jcx View Post
but if you move up/down, L/R a meter? - likely >20 dB drops/roughness from beaming at those frequencies
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?
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Old 15th May 2012, 01:51 AM   #8
dheming is offline dheming  United States
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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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