I've been spending my evening listening to User Showcase songs in a rented room on a laptop using earbuds. Most of the mixes don't sound good at all on the earbuds, but this one actually sounded pretty clear.

The ones that DON'T sound clear on the earbuds tend to sound "boomy" <- (is that even a WORD??) and distorted, so I assume they're leaving in a lot of low end that probably sounds good on their studio monitors, but doesn't translate well to some other systems.

Is there a point at the low end where you just eliminate all frequencies below that?