The Holosync soundtrack on the Paraliminals is not in the low carrier range. Any comfortable stereo headphones will do. It's simply alpha to theta entrainment.
Really if you are doing the Holosync program You don't want to sleep with them as I understand the Holosync program is a meditation tool. You want your decent headphones for that. For the majority of entrainment audio 10 Hz should be sufficient.
Now for interesting research. Too much listening to any audio through headphones is damaging to ones hearing. The ears never had to deal with such constant sound. So you might want to consider turning off any audio devices after the first hour so the ears get a rest too.
AlexK
