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Is the professional stage speaker disc or octagonal?
Whether the horn is good or not has nothing to do with whether it is a disc or an octagon. Whether it is good or not depends mainly on workmanship, smoothness and sensitivity of frequency response curve, and power that voice coil can bear.

For example, whether a car is good or not depends on its overall running performance, fuel consumption, acceleration and safety, not on its appearance. This car is nice.

An original Italian RCF neodymium magnetic bass speaker has an ugly overall appearance and a small magnet, but its performance parameters and power sensitivity can beat those so-called high-end speakers in China. The magnetic force of the neodymium magnet used in this loudspeaker is more than 10 times that of the conventional ferrite magnet, which can ensure that it does not burn at twice the rated power 1 hour and at four times the rated power 1 minute.