That's interesting, considering Shannon just uses his Galaxy phone speaker without much concern for loss of effectiveness.
I have to use headphones while sleeping so my wife won't be exposed to DMSI. When she's gone, and my son's not around, I use my speaker because I prefer the ultrasonic track.
A 33% reduction, though? That's like saying the ultrasonic track is 33% less effective than the masked (since the US track can't/shouldn't be used with headphones), and I don't buy that for a second.
I have to use headphones while sleeping so my wife won't be exposed to DMSI. When she's gone, and my son's not around, I use my speaker because I prefer the ultrasonic track.
A 33% reduction, though? That's like saying the ultrasonic track is 33% less effective than the masked (since the US track can't/shouldn't be used with headphones), and I don't buy that for a second.
