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Thank you Art Welter for your time. In general, after these conversations, my design is moving in a direction I am comfortable with. Next, I need to look into local zoning requirements to see what the city I live requires before building this "box". As this design evolves I am anxious to...

Thank you Art Welter. Your post was very informative. Thanks for the Sonotube suggestion. That's a great idea. I invision Sonotube with MDF end caps adhered onto each end then the duct in the center of one of the ends. Then, poops into my head what about PVC for smaller diameter chambers? The...

Thanks for the reply, Carl. You are correctly interpreting my un-educated (sound knowledge) descriptions. I am in unknown territory when it comes to sound deadening/absorption. The idea is to reduce the noise the generator creates at ten (10) feet or so away, thereby reducing the noise...

I will start with the fact that I am not sure which forum to post my question to? So, here we go. I am building a Helmholz resonator to absorb frequencies below 250Hz. I am a newbie at this and I am still searching for knowledge. I understand the the Helmholz principle of adjusting the duct...