If you like our work, please donate through Paypal link below any amount that you consider. We have expenses, like energy cost, software licenses, hardware maintenance and upgrade, travel to remote location to record video and audio, time, s.o. Thank you!
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=GLE6SS9BYBAH4&source=url
.

Video 4K – Lautsprecher testen den Ton (10 – 20000 Hz) – 60 Minuten (eine Stunde) für lineare Amplitude, vollen Bereich, Bass, mittlere und hohe Frequenzen – Videospektrum 4K und hochwertige Audioqualität.

For more great videos, please subscribe to this YouTube channel or our Facebook page: Relaxing and useful sounds, noises and videos (https://www.facebook.com/relaxingsoundsandvideos).