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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: Added mass resonancePosted by unicon on: 9/1/2010
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Roman,
first of all I feel good about your bass horn that's what i have always bin dreaming and if i get the space for it wont even waste a minute 
I think you already know it or using it ...
You mentioned using a foam in back chamber so it adds a mass in driver and then the Fs goes down. thats a great idea and it works.and besides coupling your driver to horn you can simply measure how much is the added mass of it.
I suggest that you do add the mass in driver like coins in driver cone(and measure the coin weight too) and do added mass free air impedance test then you can see where it can bring another low resonance .then when it reaches 20% lower the free air you are getting the most out of your driver .so in loaded horn you can be sure how much foam to add and having the goal impedance you can be almost sure everything is right.
and i suggest not to try more than 20%
gl
unicon
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