Acoustic Foam vs Carbon filters-Acoustics Forum-Acoustic Fields Forum

Hello Dennis, just purchased the BDA plans. I’m one of those “lucky” guys in the red zone (15x12x8) and I don’t see myself in a 14′ high room anytime soon. It REALLY doesn’t make sense to me when I see corner bass traps for sale that weigh just 15 pounds. Your plans (and the ACDA units of course) seem just the ticket. I have some questions.

I was surprised to see the plans include the 2″ foam in the build. I was under the impression that these were going to use the carbon filters. You state that we can get 75% of the performance by buiilding this way. Is that because of using the acoustic foam instead of the carbon?

It also seems that others have been sold the carbon filters yet I don’t see them for sale. Are they available for sale? If so, how much do they cost? I’m thinking of building two units to start with. I’m here in Los Angeles.

Thanks for the great info, including the videos , that you make available to all of us novices. I’ve been enjoying the learning experience so far.