low end only bass trap with reflective fabric ?

Trying to use 4-6 " thick compressed cotton (SSI) to make a low-end only bass trap for the front wall to reduce booming in a smallish room (16'x11'x9' h), key requirement is I do not want to absorb mids and highs (e.g. starting from 2K up), and it will cover a good low end window of frequencies (not Helmhotz types); is a reflective fabric like mylar or vinyl a good way to achieve this ? I read in another forum that 'limp mounting' can help ...


thanks a lot

Maybe since I never owned a house in US, can you tell me what is "foil scrim " ? Is it different from aluminum foil ? I need to get it locally ... thx BMiDC !

thanks ! my architect found some locally for my renovation !Mr.