subwoofer buzz - how to eliminate it

You do not want to isolate the sub from the floor. You want to do exactly the opposite which is fix the sub to the floor. This is what spikes are for. Use three, two up front and one in the rear. Trying to isolate a sub from the floor is folly. Bass waves are very powerful. If you have a bad floor that resonates it will do so even if the sub is mounted on the ceiling. If the floor is that bad the system need to go in a room with a sturdy floor. Spiking the sub to the floor keeps it from shaking so much. Any shaking or vibrating is distortion. 

 all you need is the Auralex

and 

fix the sub to the floor

are they conflicting suggestions?  My floor is pretty rigid, hardwood on concrete. 

@ grislybutter

I'm the same hardwood floors on concrete slab I have two SVS Ultra subs with upgraded plate amps 1,200 RMS watts, 4,000 peak They weigh 90lbs each I did install the SVS Soundpath isolation feet My subs don't vibrate, but my house sure does  :  )

@grislybutter Wrote:

@ditusa sorry for my stupidity, how do I overdrive it? 

I am not setting the volume on my amp high, just medium. The gain setting on my sub is at 50%

Ok, loudspeakers can sustain two kinds of damage thermal, and mechanical. The noises you describe in your first post sounds like it's mechanical noise.  The 10'' driver is reaching it's mechanical limits. That's what I meant by overdriving the subwoofer. Example, excessive woofer excursion can cause the noises you were describing and also high distortion. Just a guess, maybe your trying get to much low frequency, bass energy out of a 10'' subwoofer with a small box or maybe get two subwoofers would give better performance then one. Also, a woofer's speed is determined by it's frequency not it's piston diameter. See article below 4 - Cone Area Vs. Displacement: 😎

Mike

https://sound-au.com/subcon.htm

@ditusa great article thank you!