It might not sound like a high end headphone, but the sound can be incredibly improved by EQ. Even to a point that "audiophiles" would tell you that sounds like crap to justify their super expensive headphones.

Which planar headphones would have more bass?

An ANOVA is a statistical analysis to determine if the observed variable changes for a reason other than just "chance". But, many people and even scientists (psychologists are not scientists) tend to forget what a significant statistical difference really means biologically, falling in the real of making too many assumptions.

This is not entirely true, the amount of music that someone listens is not a predictor of depression and listening to music won't end up making people depressed! Potentially, it could happen in a very particular situation? Maybe. It might be a sign of whatever is happening in life at a particular moment. You can apply the same principle to spending much time watching tv or movies, playing video games, compulsive behaviors etc. The fact that there is a correlation does not mean causation.

Do you smell your own farts too?