just bought some used monsoon mm-700.. wondering why the speaker wires don't have markings on them.. and they don't even have L/R markings

I've never listened to a balance setup to tell the difference between balance and single ended, and i guess some people will say grados isn't exactly an "accurate" headphone, i wonder what a balanced set up will do to the sound.   I am also curious as to what other "sparkling" headphones on...