I have been looking at frequency response graphs for various headphones of different types (dynamic/orthodynamic/electrostatic), forms (closed/open/circumaural/supraaural), and price ranges, and it appears that not a single headphone ever made is perfectly linear (+-2db) from 1KHz to 10KHz...

Okay, so I am very let down at the moment. About two weeks ago I purchased a new pair of Grado SR325is headphones (with the brushed silver finish) and after letting them burn-in overnight everyday for two weeks, I still think they sound not half as good as my sub $100 Sennheiser 280 Pro's that I...