The only one of those 5 categories I'm interested in is Category 2 / Interview 2 (I'm not being 100% serious, of course, but mostly...)
It's a shame it doesn't translate well into English:
Here's one quote from the translation:
Hiroaki Sato [sound design]:
"In a word, good sound flat with no coloring as much as possible. I aimed to make use of a sound personality of various headphone in the world. However, since portable audio only, it is not considered that the main big headphones, open-air type, such as use at home, mainly intended for the mobile environment, and we elaboration the sound while listening to some of the other companies as well as Sony was. I think Hi-Fi sound blood of pure audio, such as those containing the personality's ZX1."
"I wanted to remove the parts in front of the headphone output of coupling capacitor in ZX1, you have chosen a method to create a waveform in both positive and negative power.
It is possible to supply sufficient current in the braking resistance is enhanced by applying a pulling force of the "negative", not only the force for pushing the "positive", and equipped with four power further driving force rises than ever I became a powerful sore Te. Stereo stands out due to its the L / R independent source that it is possible to sound firmly over headphones Thereby, the completely separated in order to prevent signal contamination of the L / R time.
Increase in the number of power supplies can lead to cost up to susceptible to power supply noise as compared to analog amplifier, to obtain the power of high-grade "S-Master", but we preferred the sound quality to the last."
That latter quote is particularly interesting considering what has been said earlier in this thread, about the soundstage sounding (subjectively) quite spacious and wide.
Edited by Mython - 11/14/13 at 10:07am