ah ok. well, the output coming out of traktor and using your macbook pro in built soundcard is probably too much for your computer speakers to handle, so the bass isn't being represented.
you say when you record the output of traktor, it also has no bass? even after listening back with headphones?
anyway, an audio interface (or external soundcard) is a device that moves all audio processing to its own place (this is also what video cards do). so, instead of yuor macbook struggling to deal with multiple tracks playing AND running the system, software, internet, etc. you can offload all of that extra processing to a device that is made to sound good and made to not overload.
my thoughts
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