Do "soundproof" blackout curtains actually block outside traffic noise?

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    "Soundproof" is often a misnomer; curtains are primarily **sound-absorbing**. While thick, multi-layered blackout curtains are excellent at reducing internal echoes and "deadening" high-frequency sounds (like voices), they cannot block low-frequency vibrations (like truck engines). For best results, look for curtains with a dedicated dense felt or foam liner. These materials are much more effective at trapping sound waves than standard fabric alone, as noted by acoustics experts on Reddit.