Originally Posted by Spanglo
Some headphones sound great out of the box and some don't.
Of course, but we need to understand two things:
(1) Headphones and especially earphones actually work differently on different people's heads. The Pinnae and ear canal vary strongly from person to person and they have a strong effect on the technical performance of headphones and earphones.
(2) People have vastly different expectations for technical sound quality from speakers and headphones.
Some need EQ'ing to boost frequencies and other headphones need to be toned down in order to get good sound.
For the reasons stated above, the way that people eq good 'phones is very individual. Of course some 'phones have fairly dramatic specific shortcomings and given the choice and ability people on the average are going to want to address that, Lots of people are lost when faced with an equalizer that could do a lot for them.
I assume you listened to the headphones on the same equipment and settings? Might try dialing in each pair until your pleased with their sound, then comparing them again using their respective, optimum setting. I would definitely expect the Sennheisers to deliver the better quality sound.
I agree that having high standards and using speakers and headphones without a good equalizer at hand and effective training in how to use it would be a recipe for dissatisfaction.