This review is the result of a project I've wanted to do for a long time - to EQ an audiometric headphone to determine whether it can compete with similarly-priced headphones that are played without EQ. I don't know that there's going to be any correlation to other audiometric headphones (perhaps not), but in the case of the HDA-280 it not only competes as stated, but sounds better than most of those $300 headphones I've had (i.e., Momentum, Amperior, HD26, B&O H6, B&W P7, Beyer DT1350/T51p, Focal Spirit Pro etc.).
http://www.hifiheadphones.co.uk/for...-280-audiometric-stereo-headphone-review.html
http://www.hifiheadphones.co.uk/for...-280-audiometric-stereo-headphone-review.html