How To Build Acoustic Sound Absorbers - just 30$ DIY IKEA Hack - YouTube
Acoustic panels - IKEA
Amazon.com: RYB HOME Large Soundproof Blanket, Thermal Insulated Door Curtains for Doorway Noise Reducing Divider for Workshop Basement Laundry Acoustic Covering as Moving Blanket, W48 x L96 inch, Black, 1 Panel :