I can hear both mosquito tones and they are most unpleasant upon the ears. I would boycott a place using such a device. I’ve heard that in some countries the use of it is banned as it breaches human rights laws. Another unwanted side effect is that it discourages mums with children from using the shop, as well as those who take pets along with them – usually dogs but I’ve seen people walking with a cat outside my village shop (the cat remained outside, it wasn’t on a lead either but was walking to heel alongside a young woman and a small child who seemed to know its name :laugh_at: )

yeah i can hear 18khz ok, up to 19 it’s a real push to hear it but it’s just about audible .. at 20 i can’t hear anything .. all though can more sense there’s a noise if that makes sense.

Quite surprised (and chuffed) here – I thought my hearing was fecked in one ear and deteriorating in the other (a result of bad in-club rigs 20 years ago – I remember noticing I couldn’t hear as much when mixing a band one time, and put it down to distorted nasty speakers that I had been working with the year before – I started wearing ear defenders whenever playing in a place that I didn’t have control of the rig in)…

The surprise is from the fact I could not only hear the 17.4KHz tone clearly (and I agree it is very irritating when heard for a short time – I’d likely be fit to bite something if subjected to it for any length of time), but on the hearing test tone page I can hear the tone coming in at 22KHz in my right ear (the not fecked one), and just over 18KHz in my left ear using a pair of sennheiser headphones and setting the sample rate on my sound card to 48KHz. Interestingly when it was set at 44.1KHz I couldn’t hear the tone in my right ear until it hit 20KHz – I assume this is probably down to the DAC on my sound card not rendering the 22KHz tone properly when it’s the extreme top end of the range as it is with the sample rate at 44.1KHz…

Seems the damage did get done to my left ear (which I tended to use to check whether the speakers were working when using in-club systems, so it bore the brunt of the nasty distorted sound), but my hearing is deteriorating nowhere near as badly as I had thought it was raaaraaaraaa…

Thats nasty and they would be adding me to the list of people who would stay away from their shop – fs bad mp3 music is bad enough and some shops run their cheap cables for their tannoy along the power lines and they make a similar noise …..ouchies