It is noticeable in three ways:
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- the speaker plays a lot lower, so in many 2.0 applications you really don’t need an external subwoofer unless you really want the extra thump.
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the transition from mid to low is much smoother so the sound blends more seamlessly
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sometimes other bass ports will make a whooshing sound when cranked up too loud. Instead of hearing the music you are hearing the air turbulence caused from the speaker being pushed. This eliminates that turbulence
It has the potential to add cost with additional molded and shaped parts so it has to be carefully designed to hit these price points.