Stack Audio Auva Isolator

I will be interested in your experience--my understanding is that AUVA w/ spikes will couple (not isolate) the speakers to your concrete floor while your podiums were de-coupling your speakers from the floor--one would think the results would be vastly different but since you're using different speakers than with the podiums i wonder if a true A/B is even possible?  Maybe try them with and without the spikes?

@wyoboy

Coupling is relative.  The ideal situation IMHO is to minimize transfer of sound to the floor AND minimize the back and forth motion of the speaker due to the woofer motion.

Most of the acoustic coupling happens from the speaker panels vibration in the middle, not the corners (more or less, depending on internal construction).  That is, by minimizing the surface area of the bottom panel which comes into contact with the floor you've achieved most of your goal.

The other issue is the  energy needed to move a speaker back and forth.  You can test this somewhat yourself by pushing back on the top of the speaker.  Small speakers on stands with powerful drivers can be the worst offenders.  The woofer motor pushes against the frame, effectively reducing the overall amplitude because the speaker moves in opposite directions of the driver.  Weight sometimes helps here.

Of course, this is all relative.  Narrow, tall speakers of moderate weight and woofers up high are going to have a harder time than big heavy speakers with the woofers at floor level.

Worst acoustics are presented by right angles stacked one atop the other with right angle transitions hooking them altogether.

The top nail in the coffin starts at the top with a nut attached to a machine screw with many adjustable threads creating more interference along its decline into more dissimilar materials inside of the stacked right angles. Delay Delay Delay. generates more interfering energy..Tom D

Man, the last couple of posts were over my head. I just care if it improves the sound quality.

ozzy

The fact that bearing material has been added to audio devices is nothing new or novel. It was used back in the 90’s to load inside and around audio conductors to provide an additional method of shielding and in addition provide a means to dissipate electromechanical vibrations from around the conductors. Many materials and geometries were tried along with their dimensional sizes. Any single change could be easily heard. Wrong choice of material and size could create over damping even around a conductor. At least 2 companies-built cables with these varied ingredients and properties. Star Sound Technologies now known as Live Vibe Audio and the previous Virtual Dynamics.

In the 50’s sand was added as a fill material to a hollow space in speaker cabinet walls, it worked so well it was a detriment. Example of over damping.

Lead shot was added to speaker stands and filled to the brim. They too were overdamped and shut down the space and air the speaker could actually project. Darkness was the result. Steel shot works really well as it has a lower mass than lead and is more reactive. Selection of bearing size is also important as to small an OD can create over damping as can filling beyond the resonance point of the tube or the rectangle being filled. Over the top is not always the best choice.

In my US patent 9858903B2 I show how different filler materials including magnetic spheres preferably gold-plated can act as a wave guide and affect the acoustic outcome of stringed instruments which includes and applies to speaker legs and feet. Shape geometry is also crucial in reducing and even preventing the occurrence of interfering energy returning back into the device in play. Right angles are bad for sound. Exposed threads and nuts pollute the signal with their multiple paths and continual collisions of shear wave interference that do return into the signal path. Many of these conclusions can be heard while listening in person to a stringed instrument most of which then can be applied to an audio component.

This patent was granted in 2018 and is still actively held.

TomD

Tone Acoustics and Live Vibe Audio