I’ve searched for Frequencee on apple apps, and didn’t find it.
How else can we test the volume of the ultra sound subs?
Thank you 
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Im using Decibel Meter or db meter. The lite version is free and is working properly.
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Thank you @Bjay . So decibel meter can test the ultrasound too?
Ok, I’ll give it a go.
Thanks.
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@MerranG Yes, it shows the volume and what frequency range is being used. Especially if you turn your screen to the side, it is good to see.
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If your App Store is in a country the app isn’t provisioned to show up in that country’s App Store storefront that might explain why you aren’t seeing it.
This link should work otherwise.
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