JaccoW
Senior Member
- Thread Starter
- #41
I'm loving all the suggestions out here. Even if I only end up using one of them it's cool to see what others have come up with.
EDIT: You might enjoy the generic formula from the Product guide of Sorbothane itself.
I'll see if I can find the metric equivalent of that formula, but for now I have the 30mm (1.18") sorbothane hemisperes incoming which are rated at 8-16kg for 4 spheres. With the current load of the speakers + stands + marble plate sitting at around 13kg that should be well within its useful range.[edit: sorry I replied to the wrong post. This was meant to be directed @JaccoW ]
The sorbothathe hemispheres should work for you. You just need to make sure they are loaded properly to get the best results. You want them to be loaded close to the max rating. Then the natural frequency will be less than 10Hz and you will have good isolation down to 20-30Hz.
View attachment 171778
You can easily calculate the natural frequency if you know the deflection. Attached are some hemisphere deflection curves from Sorbothane (small are the 0.75" dia, medium are the 1.25" diameter, large are the 2" diameter).
The natural frequency is just fn=(1/2*pi)*(g/D)^0.5 [see here: https://ocw.mit.edu/courses/mechani...ti-dof-vibration/MIT2_003SCF11_rec10note1.pdf]
g is acceleration from gravity; D is deflection. If you use the Sorbothane deflection curves convert inches to feet and then you can use g=32.2 ft/s^2 in the calculation.
EDIT: You might enjoy the generic formula from the Product guide of Sorbothane itself.
Yeah @spiral scratch and @muslhead mentioned them earlier in the thread as well. A quick search for Wagner MP-4E seems to turn up 10x10x2cm (4"x4"x0.8") for around €5 ($5.60) a piece. Just ordered some to experiment with... though I only realized after ordering that I might have ordered a lifetime supply if you are supposed to cut them up into smaller pieces.Hi
I have had good results with these.
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The price seems to have increased a bit since I last bought any but you may be able to find similar cheaper. No measurements though just my own feelings.
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