There are two products: Quake Secure and Quake Hold.
Both were designed to prevent items from falling off shelves and other flat surfaces during earthquakes.
I currently use Quake Secure on a shelf in close proximity to my SVS 20-39 PC+ on which my wife has a collection of angels. I have all four attached to the shelf and the shelf to the wall with Quake Secure and I can literally rattle the door adjacent to the shelf with the sub but neither the shelf nor its contents move...
I believe you will find the product more than sufficient for the double bass attack you have planned.
My .02 with the product. YMMV.
Live from Austin, Texas.
WhatFurrer
