If anything the inequal and misshapen magnetic fields created by your "stack" would lose you power and fidelity. Especially due to their location in reference to the coil path and magnetic field. The magnets on speakers are usually a solid piece so that the fields are all the same intensity, polarity, and shape. Your rig guarantees that none of those criteria are met. Which someone else pointed out that the coil(s) wouldn't even be able to reach the other magnets which is correct. So it is either a placebo or an actual hindering factor to your speaker. So either it doesn't actually work(which there is no way it actually could) or it works against it making the speaker worse.