That sounds like a possible poor seal. Glasses? Thick hair? Closed headphones are more sensitive to seal than open headphones due to acoustic impedance, the net effect is leakage can reduce bass for closed headphones, similar to how many IEMs need a good seal to deliver bass.I have the Noire X and they have bass, but virtually no bass punch/rumble/thump. Despite what the frequency response curves say, my HE1000 Stealth headphones have much better low end. Strange...
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