Equalizer APO and its high pass filters

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I downloaded this program and played a little with it, listening to music on my bluetooth speakers that have 10 cm midwoofers that dig to 70 hz at best.
I noticed when applying a high pass filters at 42 hz that the bass performance is dramatically improved , it sounds like bass boosted actually. Is that result of relieving small woofers from low bass duty or just those filters create a bass hump above cutoff frequency ?
 
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