(01-10-2012, 04:33 PM)AVB2011 Wrote: GK,
I just wondering what speaker do you use? If you rolling on the ultrasonic, you have to make sure your speaker has the right frequency response, which is at least 20,000 hz or 20 KHz.
Hi AVB,
I use these speakers: Creative A60, with Response Bandwidth: 90 - 20000 Hz.
And Koss PortaPro headphones when I'm awake (and using my computer), with Response Bandwidth: 15 - 25000 Hz.