Thusly "jeffc" Spake Unto All:

Just curious: what makes you think that people who listen to opera don't
like hearing treble through their headphones?

Probably for the same reason he thinks all Sennheisers are bad because he
didn't like one particular pair.

It is the third pair, of three different models, although admittedly
all in the $80 - $150 bracket, I try this round, and I've tried others
before.
My conclusion is that I simply don't like the way Sennheisers sound.
To my ears they have weak bass and almost completely lack treble. I'm
happy you like yours, but I'm looking for recommendations for other
brands with other characteristics.