need ideas to raise speaker stands

Longer spikes?

I really wasn't jesting. Since spikes are used on top and below, it might be possible to buy larger replacement spikes, modify something from Home Depot or perhaps replace the spikes with large Tip Toes or the likes. Good luck. Some of the previous suggestions certainly have merit.

I hope no one thought my suggestion was an endorsement for coupling. Coupling or decoupling is system/room dependant. I was merely trying offer suggestions to the question at hand with the strategy at hand.