for real player, using Bass boost equalizer provides sufficient bass in headphones, though lowering the volume a bit. wouldn't be a problem, if you are using good quality earphones, but for supplied earphones, volume is low enough to make you use highest possible volume settings.
in case, you don't have equalizer options in realplayer, better switch to a good player like rockbox, or exmms (for audio).
once upon a midnight dreary, while i pron surfed, weak and weary,
over many a strange and spurious site of 'hot xxx galore'.
While i clicked my fav'rite bookmark, suddenly there came a warning, and my heart was filled with mourning, mourning for my dear amour,
" 'Tis not possible!", i muttered, "give me back my free hardcore!"
quoth the server, 404.