FFT AKA Fog Feed Technique is by far the best way to grow. That is as long as it's dry air (smaller droplets than the fog in our atmosphere). It is the technique that will readily supply the most oxygen to the root mass. The things you drop in fountains to make a decorative fog is not true FFT, since the droplets are even bigger than what is in the atmosphere, and similar in effectiveness to spraying the roots. These are 20-60 micron, and true fog feed is 5-10 micron. The cheapest machine to do this that I've seen is about $280. And it will raise humidity not only in the root zone but the entire grow. That's fine because you are also foliar feeding with the same nutrients that way, but less concentrated than in the root zone which is perfect for leaves. I would think this would not be a good idea in a speaker grow, unless you also have mucho ventilationo.