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I never had a riser per se' but I did use a 1" piece of granite and it seemed to really help with excessive rumble from a down firing sub in an upstairs room. Really helped with bass direction as well. It was not so obvious where it was coming from.
 

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Use two GrammaPads... isolates the sub from the floor. Not 100% it makes a huge difference. Dale very well could be right about its benefits (!) but one thing is for sure... your sub is decoupled from the floor, so you reap the benefits of that.
 

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Discussion Starter · #4 ·
Sorry, I should have been more specific. I meant REALLY raise them like 12'', 24'', 36'' etc. I've also notice that lots of DIYers have the driver quite high (high of the floor) in their cabinet.

I fully intend to experiment but was wondering if anybody has tried it and stuck with it
 

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Raising your sub off the floor can be beneficial in smoothing out room modes. The only way to be sure of what your accomplishing though, and how high to raise it, is with measuring software (i.e. REW).
 

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I run my Danley Sound Labs DTS-10 24" off the floor. It is actually in the next room and fires through an opening in the wall. It has been that way for years. Great open, airy bass you feel.
 
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