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PostPosted: Sat Jun 09, 2018 9:08 am 
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Joined: Thu Aug 21, 2008 10:17 am
Posts: 10884
Location: Santiago, Chile
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The hangers are much lighter in weight and somewhat more "springy". I think I get it now, why it should work much better.
:thu:

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Looks like these 4 disc pads should do the trick
You will be placing pads ABOVE the speaker? Between the top surface of the speaker and the upper panel of the enclosure box? They will be exerting some pressure downwards on the speaker, so you need to account for that in your calculations. Add it to the weight of the speaker itself, since it basically acts like extra weight, and causes extra deflection.

This is why it's important to build the box outside of the soffit, with some calculation and some "trial and error", to make sure that you get the correct deflection on ALL of the pads, on ALL sides of the speaker. The speaker itself won't be perfectly balanced: probably a bit heavier on the left side, or the right side, or heavier towards the front, or the back. You need to distribute the pads under it accordingly, so they are all deflected the same amount. If one pad is deflected significantly less or more than the others, that messes up the resonance calculations.

Floating speakers correctly isn't easy, but it sure is worth the trouble!

- Stuart -

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PostPosted: Wed Jun 13, 2018 1:41 am 
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Joined: Fri May 03, 2013 10:24 pm
Posts: 20
Location: Bratislava, Slovakia, EU
I spent 2 days deconstructing everything and then trying to get the speakers mounted corectly on sorbothane pads. I'm still not 100% sure I got it right but at least this time I knew what to do. Hopefully the measurements will tell something.

Here's the measurement of the empty room: Baseline empty room

Here's the measurement of the empty room with the new version of the hangers installed: Hangers only

I'm not sure what should I look for in the graphs - the extremes seem to get even more pronounced, but is it good or bad thing? Is it because they cleared up some of the other problems? Do the hangers work at all? :?

There's still significant difference between left and right speakers. Could the room slight assymetry cause this? (the doors in the back of the room are angled and the silencers are not centered - they are slightly to the left because of the angled doors) Or is it more probable that one of the speakers is not floating correctly?



Martin


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