Acoustical Panels for Purchase in BR

I’ve got some old mattresses. Free if you pick up.

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Simply Google

LINK on South Choctaw

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I did. And I'm familiar with them. They don't sell acoustical panels. Just ceiling tiles and custom ceiling solutions.

Hey, who's this guy think he is, Bo Diddley?

I make my own. Owens Corning 703 rigid fiberglass from Amazon, black fabric from Hobby Lobby, and pine boards. Cheaper and works better than anything you can buy commercially.

Absorption, diffraction or both?

Either way if you are reasonably handy build your own. It is much easier to get exactly what you need by doing this. Commercial acoustic treatments are outrageously priced.

For absorption panels, Owens Corning 703 (of the appropriate depth for the frequencies you want to absorb) , a wood frame, and covered with GOM (Guilford of Maine) FR701 fabric.

Diffraction is a little more difficult to design and build but a lot cheaper than commercial.

You’re not that good a rapper. You’re parents won’t like you building a rap studio in their garage.