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In the Forum: Horn-Loaded Speakers
In the Thread: Back chamber
Post Subject: The role of the back chamberPosted by noviygera on: 9/19/2015
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I would like to ask for your thoughts on the importance of back chamber shape and construction. This topic became of interest when I learned that the back chamber of my midrange horn (250hz - 2khz) is noticeably resonating when I put my hand on it, around 500-600hz region.
As you can see the original design, it's not big chamber and seems to be ok volume, creating a 190hz knee below which the freq response starts to fall off as this horn is specified to be 200hz and up.
However I am thinking it must be very important to forming a good bandwith limit AND at the same time, not adding own sound to the driver above that limit by resonating at all.
Does it need to be as rigid as possible? Does it's internal shape matter and are standing waves as issue in a small chamber? Should all volume be stuffed with damping felt?
So I start playing with improving this thing and a few things come to mind such as:
1. making smaller internal volume to raise the low freq knee (because I use crossover of 300hz)
2. increasing all external walls strength of this plastic chamber with wood frame or fiberglass epoxy
3. damping internal walls with either cork or aluminum butyl sheets (dynamat)
4. adding or subtracting damping material
What are good ideas to try and what is the final goal if you learned that your chamber is flimsy and resonating?
Gera
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