I listen to a lot of classical, from renaissance mass, to baroque to classical era to romantics to 20th century composers and recordings from string quartets to symphonies, cantatas, opera, etc.
I would say that bass is not the enemy of classical music if well controlled and balanced and that, in fact, a cold, dry, bass-lite earphone doesn't do justice to the full range of many classical music pieces or the emotional depth they evoke. Without bass, timpani, double bass, cellos, baritone and bass voices, etc. just aren't present as they should be.
The issue is not bass, but rather balance and control with a special focus on timbre--the realistic reproduction of the subtle resonances in instrumental and vocal music.
In fact, two of my favorite earphones are the monster turbine pro copper, which while being quite bass capable, has good balance and control and also the FS Atrio, which has good timbre reproduction and a well-controlled bass with excellent extension. I haven't heard the GR07, but I wouldn't count it out as I think Lee730's description makes it sound like a good earphone for classical. I would avoid etymotic's anemic bass, but some classical listeners would disagree.