It should be noted that what you are likely referring to as “magnets” are NOT the things doing the “wiggling”. The voice coil is what is doing the “wiggling” and causes the speaker cone to “wiggle” with it.
Now the voice coil IS a magnet (an electromagnet), but when one refers to a “magnet” they usually mean a permanent magnet (that big hunk of metal at the bottom of the speaker). When you send a current through the voice coil it creates a magnetic field which pushes or pulls against the permanent magnet which remains stationary.
Cheap speakers are cheap because they’re using the least amount/quality of materials, and they also tend to be done with a minimal of engineering–if it makes a sound that’s all they care about.
High quality speakers will have stronger magnets, and larger gauge wiring. This allow for high current pushing against a stronger magnetic field–you can drive heavier cones and the speaker can respond quicker to signals. Stiffer cones can provide superior performance since you’re not getting undesired overtones due to flexing of the cone. Cheap speakers use paper cones, more expensive ones use stiffer composites. The box that a speaker is placed in can have a dramatic effect on the frequency response. You can coax more bass out of a speaker by designing the box it is placed in. A larger throw than normal can allow the speaker to “throw” more air making it louder.
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