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In Reply to: RE: Is this difference at 114Hz and 125Hz normal? posted by tomservo on July 16, 2016 at 12:14:16
It seems that the main cause is floor and ceiling reflection. As an experiment I put a 24"X48" bass absorption panel on the carpeted floor below the desk. That reduced the dip at 114Hz significantly. The effect diminishes as I lift the bass absorption panel one inch from the floor. I heard the model is 244 Bass Trap.
Previously, I could not imagine such a deep suck-out in the frequency response curve, because the listening position is what is called "near field." The pass length difference between the direct sound and any indirect sound (except the desk surface reflection) is quite big.
Follow Ups:
Rooms are funny. Make it sound good to your ears and worry a little less about the graph while still using it as a guide.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Unfortunately, the bottom line is if you want perfectly flat response get headphones. I don't like using headphones all the time so this is still a valid point, but getting to perfection is a long long ride. In fact you can really only get it outside where there are no reflective surfaces to screw up the sound.
To find out if the peaks and dips are in the room or speakers, move the speakers and remeasure.
And, how are you measuring ? Are you using a swept frequency or pink noise ?
You can see measurement curves online. They are very nasty. There is no flat response headphone in the world.
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