Don't foam mods and such mods reduce overall sound quality?

Will EQ alone take care of the sharp treble?

Did you have any problem with treble?

BTW, I can use an EQ to solve the sharp trebles in 681.

What do you guys think about Monoprice modern retro? How do they compare to Koss KTXPRO1, Superlux HD681B and others?

I am going to use them in my quiet room on my computer. I don't care about isolation, sound leakage, headphone type or tonal balance. All I want is the best sound Quality I can afford. I mostly listen to rock and classical music if that helps.