Here is my thinking about the spider/suspension. Besides the fact that the spider/surround keep the coil lined up in the middle of the gap does it have a place in the speaker? Once energy starts moving through the coil and it starts moving is there anything useful, besides lining up the voice coil, that the spider is doing? If the polarities are constantly switching in the coil then would it not control its own up and down movement and not need this resisting force to bring it back to the middle? Imagine a speaker that doesn't have a spider or surround to restrict the linear motion but has some sort of suspension that does keep the voice coil lined up correctly in the gap. Also assume that this system does not allow for the voice coil to ever leave the gap in a way that it can't bring itself back in. Does the speaker need the voice coil to be brought back into the middle of the gap linearly? Picture the magnet on a speaker. The speaker is firing up. The top of the magnet is north and the bottom south. Now imagine sending a signal through the coil and it has no suspension to restrict is linear motion. It is sent a signal that gives the coil a north polarity. The coil moves down, but not out of the gap entirely. It never leaves the Xmag. The signal stops and the coil drops to the bottom due to gravity. Say another charge makes it north again and keeps it pushed down. Even if the signal is only for half a second and at only 20 Hz then the speaker still changes polarity 10 times meaning that the coil will be down for one time then gets shot back up to function just as a speaker with a traditional suspension works. I don't know if anyone would be able to notice that 1/20th of a second. Then as the Hz rizes then that smal delay gets even smaller. Then also if the speaker is at full down position with a previous north charge and the amplifier sends the opposite south charge to it then it doesn't miss a beat and is swung into the up position immiediately. One problem I can think of for a speaker with a suspension that doesn't restrict linear motion is that perhaps it would be like a chain reaction where if it is not brought back to the middle then the speaker coil would have to be ultimately shot off. For example a large signal sends the coil into the upper north section of the magnetic gap. Before the speaker can drop the frequencies and amplitudes change so that it needs to vibrate quickly. So does it get stuck in that upper quadrant and the next big signal sends it smashing past Xmag or will the voice coil find its own equilibrium within the magnetic gap? This is all extremely confusing and I need to start reading up on magnets. Does anyone else here know anything about what I'm talking about? I know that no one knows exactly what I'm talking about because this is just a rediculous hypothetical topic. I want it answered though. blahhh...I might need some sleep after thinking about this one.