I needed for listening to therapeutically active healing frequencies to the brain and hormonal control an in-ear headphones that can be used even at night, which is not constantly slipping out of the ear, so that many frequencies, upper and lower tones are lost. In addition, I needed for a high quality of transmission. For example, a very wide-Hz frequency response and 16 ohms Nennimpendanz. also the sound pressure had to be relatively high, thus dumpfere and darker tones are transmitted sufficient to ensure the therapeutic effect (Eggetsberger frequency pharmacy). After I had scoured the whole market in all (some frightening) price ranges, I am with this cheap Sony MDR-EX210 headphones. Gee, really great, this price / performance ratio.
