What, where is this sound coming from?

[Mat]

There's a person letterbox!?

Most of us just call them doors.

 

[Greebo]

15k here. Guess im old or I abused my hearing when younger

 

[MadMouse101]

Demnons.

 

[Terminal_Boy]

15KHz, but only just.

 

[ScoTTyBEEE]

Definitely demnons, classic mating call. Takes approximately 25 years for them to find a mate.

 

[teh_captain]

It's almost definitely the sound of a Mac10 being acquired in around 1.5-2 seconds.

 

[ADT]

Maybe it's your dog letting out some air

 

[dacads]

I like your conclusion, I think we'll stick with it.

I can hear up to 18,000hz it stings like a *****!

*queen wasp

 

[Tomsk]

Any orange plastic bags lying around?

 

[Tosno]

Russian numbers station.

Агент 2476 знает и ждёт пока мы скажем что сделать с нашей стороны.

 

[Gzero]

15k here. Guess im old or I abused my hearing when younger

Actually it might be your speakers are just duff.

My Ls2.1 logitech speakers can play the 16k and I can hear it, but I can't hear the same 16k from my Steel Series Siberia V2's usb version.

 

[Pawnless Endgame]

 

[Deleted member 651465]

Postman delivery letter post point. As there is no snow, you hear an audible beep.

No beep = snow approaching.

 

[StoutMeister]

Distant sound of a letterbox opening.

Creeeeeeeeeeeeeeeeeeaaaaaaak...@ 107.67hz

 

[Arsonist]

Surely it's one of those contraptions that scare cats away from houses?

For the first post, you ain't half a party pooper! This is GD!!

 

[SexyGreyFox]

Lol, Rofl, where did you get that from?
I've seen the bloke before but never seen that.

 

[[TW]Sponge]

For the first post, you ain't half a party pooper! This is GD!!

I just thought it was too blindingly obvious what it was I couldn't contain myself.

If you like..... Letterbox, delivery, poo, aliens, queen wasp etc.....

 

[QlimaxUK]

if your phone picks it up just record it and send us the sound instead of posting a graph which proves nothing

 

[Jumper118]

coil whine from all the 970's

 

[StriderX]

High frequency generators are the bane of my life, I swear the police use them occasionally to control areas.