If I may, I know the curtains won't soundproof. but why the companies claim that they're making soundproof curtains https://www.geekwrapped.com/guides/best-soundproof-curtains see reviews on them at the first time.
It might knock down a bit of the upper frequencies but the mids and low end will go right through it.
It might knock down a bit of the upper frequencies but the mids and low end will go right through it.