Set of 4 Townshend Audio Seismic Isolation Speaker Bars Size 2 420mm x 724mm adjustable, free worldwide shipping superb!

TOWNSHEND AUDIO Seismic Speaker Isolation Bars Size 2 420mm x 724mm 16.5 x 28.5 Inches For all LOUDSPEAKERS and SUBWOOFERS.     Price is for 1 SET OF 4 BARS 

The Seismic Bars add a mere 2cm to the height of a loudspeaker. This is important not just for obvious centre-of-gravity reasons, but because boundary proximity affects low frequency performance, so raising a speaker up too far will make for a leaner bass than originally intended.

PLEASE CONFIRM WHICH SPEAKERS YOU OWN OR WEIGHT AND FOOTPRINT SO CORRECT BARS ARE SUPPLIED THANK YOU.

TOWNSHEND AUDIO SEISMIC SPEAKER BARS 

• Produce a wider and deeper sound stage.
• Enhance clarity throughout the whole frequency range.
• Improve bass definition.
• Eliminate structure-borne feedback between the speaker and vibration sensitive equipment.
• Allow for neighbour friendly high level listening.
• Eliminate irritating boom caused by coupling through the floor to adjacent rooms.

Seismic speaker Isolation Bars are designed to break the acoustic connection between speakers and the floor, thus preventing the passage of unwanted vibration between the two. Used in pairs under any speaker, be it floor standing, or stand-mounted, including sub-woofers.
Because of the very compliant nature of the Seismic Load Cell, the speakers effectively float in the room at frequencies above 3 Hz. Each bar comprises a very strong steel cross-bar with raised ends under which are attached two Seismic Load Cells.
When installed you experience The Townshend effect, the sound improves dramatically, wider width and greater depth and becomes independent of the speakers. Bass becomes tighter and real, with thuddy boom eliminated. A major plus is that the sound of the speakers is no longer transmitted through the structure of the building so your neighbours can no longer hear your music.
Conventional so-called rigid supports (spikes or cones) aim to hold the speaker cabinet "still" at audio frequencies. However, there will be a resonance set up by the mass of the cabinet reacting with the unavoidable springiness of the floor, which can cause vibration of the building structure in the audio band. Rigid coupling also transmits ground-borne vibration into the speaker cabinet and thence to the speaker driver baskets where it is superimposed onto the music. By using Seismic Isolation Bars, you will be able to enjoy your music at its natural volume,- as if you were listening to a live performance-without annoying the neighbours 
To install,  
First, remove any spikes or cones from your speakers and slip one bar under the front of the speaker. Then tilt the speaker forward and slide the second bar under the rear. Very small adjustments allow for setting the speakers vertical. Even though the speakers are floating, it takes a very big push to topple them.

The Seismic Bars add a mere 2cm to the height of a loudspeaker. This is important not just for obvious centre-of-gravity reasons, but because boundary proximity affects low frequency performance, so raising a speaker up too far will make for a leaner bass than originally intended.

Improving bass definition and eliminating structure-borne feedback between the speaker and vibration sensitive equipment, is only two of the ways that the Townshend Seismic Isolation Bars work to improve the audio quality from your speakers and subwoofers. 

The Seismic Isolation Pod is a Seismic Load Cell™ with a circular foot attached to the lower end cap for stability. The length may be adjusted by turning the top end cap, which allows easy levelling of audio equipment placed on a set of Pods. There is a soft felt protective piece on the top and bottom faces of the end caps to allow for easy positioning and to prevent scratching.

"Townshend Seismic Speaker Bars produce a result that goes way beyond what you might expect from ‘speakers on springs’. To get an improvement in absolute resolution, precision of timing and solidity of stereo image from something so apparently simple is extraordinary. These things really do change the game, move the goalposts, and revolutionize the way we should think about speaker support. This is not an accessory… it’s essential." 

• https://www.hifiplus.com/articles/townshend-seismic-speaker-bars/