Here’s a thread from last year that you may want to look at: Best-sounding earbuds, only $12? But I don’t think anyone in that thread specifically mentions bass; and its OP refers to audiobooks, for which bass isn’t really an issue. The article that its OP links to does, however, make some mention of bass, and if you read far enough, it recommends the $39 Urban Ears Kransen as an alternative to the main recommendation for people wanting heavy bass.