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In the Forum: Horn-Loaded Speakers
In the Thread: Designing and building a 5 channel horn loaded (looking for directions on my way)
Post Subject: Floor bounce...Posted by anthony on: 3/11/2016
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 kodomo wrote:
Hello Anthony

You can see the two main problems being 70hz and 200hz in this graph. 200hz is from the floor bounce of the basshorn. I will add absorbers to the floor. The 70hz peak is from the Tad bass units sidewall reflection. That area will also be treated with acoustic absorbers. 


Kodomo, I have not looked back through the thread to see what your horns are made from (they look great by the way!), but have you put an accelerometer on your horns and measured their resonating frequencies?  Ever since I put my hands on a circa 110Hz fibreglass horn and felt it shaking I wondered how much "noise" in dB it was making of its own which is why I have made my UB horn so massively heavy from MDF...even the backchamber is enormously thick to counter the vibrations from the back of the driver.  I am not ready to measure this myself, and I don't really know just how much it could contribute to the frequency response, but I find it interesting nonetheless.    

If you feel it is worth looking into, perhaps try adding some temporary mass or damping to the outside of the UB horn and remeasuring the frequency response to see if any dips or bumps move at all (remember to do the before measurement with the microphone in exactly the same position).  Or if you have an accelerometer, give that a go.  I would be most interested in what you find...but your horn may well be adequately damped and you will find nothing at all. 
Cheers,
 Anthony

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