Custom Design Inert Filler (Bag)

Inert Filler is a brand name Copyright © to Custom Design (Newcastle) 1994

The benefits of Inert Filler and mass loading speaker stand support column(s) will be to enhance the performance speakers and the speaker stand support.

Mass loading and dampening the centre support column(s) is an important initial upgrade. Once mass loaded to our recommended amount, the performance will be particularly noticably to the bass frequencies, with a more controlled and precision timing to the bass frequency. If you feel the bass still requires enhancing and control then add a little more Inert Filler.

For over 24 years Custom Design have recommended only Inert Filler for all of the speaker stand designs. With constant research and development we have not found a more appropriate material.   

Inert Filler is a specially sourced material for dampening speaker stand support column(s). The particle size of 1mm to 2mm with angular features provides an ideal material for appling and mass loading speaker stand supports.

Inert Filler is an inert material, none resonant, none magnetic with the dense consistency and angular particle size. These angular shapes help prevent the presence of any voids (pockets of air) occurring inside the support column(s), eliminating as much as possible of the air inside the support column and dampening any possible resonance influence from the speaker stand support column(s).

As a simple guide to follow, Custom Design recommend at least 2 bags of Inert Filler per 600mm column if it is not supplied as standard. Please be aware that we have found over mass loading can have a detrimental effect on the performance of your speaker, removing any benefit especially to the bass frequency timing and precision.

The advantages of Inert Filler, supplied in dry individual sealed bags or boxes of 8, is a none magnetic material, a none resonant material, will not rust and application is simple. Perfect for dampening speaker stand support column(s) and easy to apply.


A box contains 8 bags £34.99 Approximately 13kg

Per bag £4.99 Approximately 1.7kg

Image above: Box of Inert Filler

Image below: Bag of Inert Filler

Custom Design only recommend Inert Filler for mass loading with all of the speaker stand support range.

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