I just learnt about quadraphonic audio format after downloading an album coded as such and I am wondering if my bose 700 headphones are equipped to actually make a difference with this format? Would it be better to stick to FLAC? What is the best option / format to actually enjoy the best sound quality? I have a turntable from the 90s connected to a cheap preamp that I bought on Amazon and that has not a headphone output... I read that there's nothing like vynil audio in terms of quality and detail. While I get a new one with the headphone exit, any ideas on what would be the best digital audio format to enjoy ony headphones?