ultrasonic question

[ArcticFox]

Do I need a special type of speakers to play ultrasonic or can you play it on any type of speaker without it damaging it. Can I play it on my pc speakers or my tablette spekes just fine ?

Yes most speakers are generally OK. Preference is for stereo and a frequency range that goes to at least 20Khz.

Use the speaker test audio here: http://www.subliminal-shop.com/product/speaker-test/

also download a decibel meter for your smartphone and measure the db coming from the tablette/PC speakers. I go for around 65db which is just above the level of someone speaking to you.