Though I have never used "The Packaging Store", the ones I have used, always used peanuts, as their padding, inside the box. They would double box, for the cost, of an additional box. They always added a 10-30% markup, over the cost of the carrier. If you need to wooden crate them, may I suggest, you go to any industrial tooling factory. They routinely receive spindles, packed in long wooden crates, which I have found, work great. Just pad the speakers inside, with enough material, so they don't move, and ship them the fastest way. They less time, a carrier, has to handle them, they less chances, they have to damage them.