those tiny little earphones only reproduce bass if they are in your ear, coupled to your ear canal directly. used in the manner you are proposing, will only reproduce high mids and highs. the reason headphone manufacturers use a 3 or 4 inch driver, is that is the size required to reproduce full range response in the space of a headphone cup. again the headphone is somewhat directly coupled to the ear canal, but instead of moving an air column of a fraction of a cubic inch (which is what the ear bud is designed for), the air column is several cubic inches, so requires a larger driver.