Should I add a sand base to Visaton Alto IIs?

[mentaldrummer]

Hi, I'm in the process of building my first speakers - some Visaton Alto II
Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories
which someone recommended on here as a good first project, with parts available in the UK (which seems to be a bit constraint).

The build seems pretty basic, and I was wondering if it was worth making and improvements to the cabinets. Specifically I was wondering if I should fill a small compartment with sand at the bottom - both to stabilise the speakers and to improve the bass. This will obviously change the volume of the chamber housing the speakers. Does anyone have any opinions on if this is a good idea?

Thanks
Niall