Re: Do we "need" those >20kHz ultrasonic frequencies for high-fidelity audio? 2017-04-11 17:10:09 Quote from: Jakob1863 on 2017-04-10 16:03:00Quote from: Porcus on 2017-04-10 14:08:42<snip>Archimago's posting is sufficiently up-to-date to know research that has refuted your reference (Oohashi). So if you want to update yourself, that is likely a good place for you to start. May i politely ask that you don´t just trust Archimago´s writing but read the papers by yourself?I have.It's possible you've only been here since 2015. If so , may I politely ask that you dos oem research *here* on HA? This topic (including Oohashi's crackpottery) has been discussed before, to put it mildly.