06-22-2014, 04:35 AM
I am doing the same thing Ricardo. I have a pair of Logitech Z120 which meet the 20KHz and I just want to know If it is working or if I am doing it right. I use my Samsung Galaxy S3 to play the ultrasonic with the speakers and there is no crackling or static but when I plug it into my PC there is crackling at full volume but not with the phone.