Not sure where to post this. Does anyone have any ideas on how to design a setup capable of delivering a SPL of 130db at about 10m using a class d amp. I have some neighbours who are using music as intentional harassment towards our house. This is because i asked them to turn the music down late one night. They randomly point speakers towards my house and play very loud music for relatively short periods of time at night when they are having parties and think it is very funny. They know that it will take the police an hour or two to arrive and turn it off before they are likely to arrive.
I have read a bit about the use of high volume high frequency accoustics as a deterent. I have seen various devices for sale online but they mostly seem like scams. I am wondering if it is possible to make a powerful device to deliver a 20-25khz signal at 130db or more at about 10m in a very directional way. The idea is to create discomfort.
My immediate thought was some kind of class d amp with a digital single frequency tone and appropriate speaker capable of handling power and frequency. Anyone have any experience in this or have any theoretical suggestions for a suitable amp or speaker deaign?
I have read a bit about the use of high volume high frequency accoustics as a deterent. I have seen various devices for sale online but they mostly seem like scams. I am wondering if it is possible to make a powerful device to deliver a 20-25khz signal at 130db or more at about 10m in a very directional way. The idea is to create discomfort.
My immediate thought was some kind of class d amp with a digital single frequency tone and appropriate speaker capable of handling power and frequency. Anyone have any experience in this or have any theoretical suggestions for a suitable amp or speaker deaign?
Last edited:
That's not the way to win this battle. Record their music, photograph the level on an spl meter then take them to court. Just make sure you have an extensive and detailed history of the harrassment.
Have sought legal advice. The law here does not work that way. To build a case for a "nuisance" charge is very complicated. Almost impossible to prove it is intentional. I have tried to explain the situation to police but they say just call when it happens. I do and they never turn up. My family has been living with this for 2 years now. Unless you can prove you fear for your safety i.e.Personal Violence Order, you can do very little apparently. As it is directed directly towards my property it does not affect others in the neighbourhood enough to get their support.
Last edited:
Surely make a sound activated recording device over a specific level - then place the three on each corner of the house. This shows which side of the house the noise comes from and front/back.
Then any time during the day/night you automatically build up a log and can demonstrate an ongoing pattern. There defence is that you've recorded yourself.. etc but at least it shows there is noise.
Adding video cameras is difficult because both light and videoing elapsing onto other people's properties can backfire - essentially you've escalated and secondly it be comes a privacy issue to which you become be baddie.
130dB+ signals becomes a health hazard and you open up yourself for being sued for damage to hearing etc.
to win battle in the court,...takes very long time, to divorce from your wife get much faster 🙂
as a Dj I would recommended
10 KW Class D Electronic Music subharmonic basedrum from > 30 Hz up
Your neighbour will feel the earthquake in his house everything shake and feel uncomfortable, do it regularly and every day when you wake up at night and have to pee to the toilet
To torment your neighbor and wake everyone in the neighboring house, do this at different times at 4 a.m., the next day at 1 a.m., and then a second time at 5 a.m.
As a DJ I have a lot of ideas. This is more effective than waiting a long time to go to court.
As I said, a divorce from your spouse is faster than successfully bringing it to court and winning, the judge may even reject the case and laugh at you
if you need DIY Class D power google for Indonesian next generation Class D Group or PM me
Good luck
This is not Cuba, sonic energy weapons are likely to backfire (LF or HF) and cause more discomfort to your family than your neighbors. Too evil or not evil enough, this will likely escalate the situation to a war. If that’s the road your going down you might as well dispense with the pleasantries and start hunkin rocks. Results will be the same as any war, no winners.
Buy an old 2" PA compression driver with a long throw horn. One Khz at 50 watt will do the trick.....
Even better: 1K plus 3,5K
Even better: 1K plus 3,5K
Last edited:
You'd...be hard pressed to get that level from a dynamic speaker at 10m. That takes a pneumatic approach and a very large horn. Think compressed air at high pressure and lots of flow volume. A voicecoil actuated needle valve modulating the airflow into the horn throat.
High tech DIY mechanics, large cumbersome structure, expensive, noisy, difficult to power energy source...
A diplomatic solution is preferable - if possible. Gather evidence, post on social media.
Perhaps IR camera would show VC heat in the speaker's drivers they're pointing at your home. Trigger measurement records based on SPL threshold, make a timeline graph showing nocturnal disruptions with the SPL meter reading together with photos of the speakers making the noise.
Sorry to read you're going through this. Like anything pleasurable in one context, can be an abuse in / when used in another.
High tech DIY mechanics, large cumbersome structure, expensive, noisy, difficult to power energy source...
A diplomatic solution is preferable - if possible. Gather evidence, post on social media.
Perhaps IR camera would show VC heat in the speaker's drivers they're pointing at your home. Trigger measurement records based on SPL threshold, make a timeline graph showing nocturnal disruptions with the SPL meter reading together with photos of the speakers making the noise.
Sorry to read you're going through this. Like anything pleasurable in one context, can be an abuse in / when used in another.
Last edited:
As far as I can see these devices are not illegal. There are many designed to repel animals. I do not want to cause permanent damage. As far as I understoood, that loud ultrasonic sound can make people feel generally unwell. There are "mosquito" devices that are used to stop young people loitering. It seems though that these are only effective due to being audible to young people and annoying. If I were to use something like this it would have to be inaudible and directional and not too big. Moral arguments and my situation aside, it does interest me whether this it is possible for a diyer to build something like this.
What about piezo electric speakers?
Piezo Loudspeaker for Ultrasonic Power Cannon (M161) Kemo Part L010: Amazon.com.au: Electronics
What about piezo electric speakers?
Piezo Loudspeaker for Ultrasonic Power Cannon (M161) Kemo Part L010: Amazon.com.au: Electronics
Last edited:
How about going for the gusto without worrying about distortion.
A electric motor driving a flapper at 40Hz feeding a horn. Real basic and powerful.
A electric motor driving a flapper at 40Hz feeding a horn. Real basic and powerful.
I'm with ds23man, just use a compression driver + directional horn. You can even use the sensors from Joe's post to trigger the response automatically:
Only trigger an output instead of measurement.
Pointing high frequency noise in their face to trigger immediately when they are being stupid should solve the problem.
Edit:
And at the same time it's not likely to bother the entire neighbourhood.
Perhaps you've got a cure for stupidity then 😀
Only trigger an output instead of measurement.
Pointing high frequency noise in their face to trigger immediately when they are being stupid should solve the problem.
Edit:
And at the same time it's not likely to bother the entire neighbourhood.
Perhaps you've got a cure for stupidity then 😀
Last edited:
Ok I'll give this a try. If it only triggers (more or less instantly) based on a certain SPL threshold then they may even think it is coming from their own equipment? I might need a bit of help with the design and setup if anyone is interested. Not sure how large the horn has to be in order to throw about 10m and be very directional but i would like it to be as discrete as possible. The JBL horn linked by ds23man looks to be 1.3m long and weighs 12kg! Is a class d amp the most effective way to drive it? Only has to be mono i guess. How about the trigger?
These piezos from your link are crap, the dispersion is way too wide which targets a way too large area and 'wastes' too much spl. It's better to use high gain/narrow dispersion horns and build an array of the piezo horns, that way you can get a lot higher spl. The drawback of an array is the possible interference but that depends on the array, frequencies and distance.
The device can be triggered by a parabolic mic and a spl threshold switch. Not very complicated but it has to be weatherproof and needs a foam cap to prevent it to go off by wind noise on the mic.
For the effect, I'm not sure if that actually gets you anywhere. The problem is, when they start such an assault, they won't be disturbed by that - they are already making noise, it's unlikely they will react to that or get annoyed by it. I have to add, I got the strong suspicion it's not about music but against barking dogs.
The device can be triggered by a parabolic mic and a spl threshold switch. Not very complicated but it has to be weatherproof and needs a foam cap to prevent it to go off by wind noise on the mic.
For the effect, I'm not sure if that actually gets you anywhere. The problem is, when they start such an assault, they won't be disturbed by that - they are already making noise, it's unlikely they will react to that or get annoyed by it. I have to add, I got the strong suspicion it's not about music but against barking dogs.
Thanks for the input. I did notice the wide dispersion of 160deg for those speakers and did think they would not be ideal. I could not find many speakers with adequate specs published to know if they would handle the frequency and what their peak frequency was. Lots of piezos are quite cheap so an array may well be the best way to go.
Believe it or not, it is about the music. I do have problems with cats p#ssing on everything around the house but no problem with dogs! Surely a very loud piercing noise which is heard above the music would be annoying to the listener. Perhaps even a trigger that gets louder with the music. Just needs to be loud enough and not annoy the whole neighbourhood more than the music being played.
Do you happen to know where I could get a suitable type horn?
Believe it or not, it is about the music. I do have problems with cats p#ssing on everything around the house but no problem with dogs! Surely a very loud piercing noise which is heard above the music would be annoying to the listener. Perhaps even a trigger that gets louder with the music. Just needs to be loud enough and not annoy the whole neighbourhood more than the music being played.
Do you happen to know where I could get a suitable type horn?
Last edited:
... Perhaps it would work to use a pipe? Not sure.
After all, sound quality can be completely ignored in this particular scenario.
After all, sound quality can be completely ignored in this particular scenario.
Yes i was wondering whether a piece of PVC pipe might work. I could wrap it is something accoustically insulating perhaps to prevent it from annoying us?
I was also wondering about a sine wave generator where you can adjust frequency run through a simple amplication circuit to the voltage requirements of the piezo speaker. Would this be the simplest way?
I was also wondering about a sine wave generator where you can adjust frequency run through a simple amplication circuit to the voltage requirements of the piezo speaker. Would this be the simplest way?
Last edited: