Manyspeakers produced from 1990 until today have (metal)dome tweeters damped with "ferrofluid." The concept is that the viscous fluid containing microscopic metal parts, magnetically held in the tweeter voice coil gap, damps resonances as well as cools the voice coil - thus improving sound quality and prevent overheating (and breaking down) of the voice coil.
Inone YouTube on KEF tweeter repair, the tweeter lead insulation was red and gold, not the standard red and black. Since the OP also would have access to the mid/woofer leads, do the same and wire up the speakers so they all push OUT (or IN) when the + multimeter/battery is applied +voltage to the determined "positive" leads. R rbarrios · #2 · Oct 2, 2018 (Edited by Moderator) I ran into this issue. Within a couple of days the speakers stopped working. all 4. Only the tweeters worked. I checked door plugs, removed radio and reseated connectors. Checked for amp, none on my model Traverse. I was ready to replace radio. Yes in most cases, crossovers are necessary for tweeters. Crossovers are a type of electronic filter used to split audio frequencies from a single audio signal into two or more bands of sound. They are commonly used in loudspeaker systems, allowing the use of multiple drivers to cover a given frequency range more effectively than a single driver.what does a tweeter do in a speaker
