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Old 9th November 2009   #2
baslotto
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Join Date: Mar 2006
Location: USA
Posts: 454

Those are frequency shelving filters.
They are useful if you hear too much highs or lows in your room.
If the music coming from your A7s sounds too crispy and fatiguing your ears apply some LP.
If you hear too much bass in your room apply some HP.
That's it.
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