First of all, we can see that the length difference of the radiator is very obvious, and the heat dissipation performance of Sinbosen D4-2000 is definitely due to the 4-1800 next to it.
Second is the inductor. From the comparison chart, we can also see that the number of inductors is also very different. Inductors have the functions of filtering signals, filtering noise, stabilizing current and suppressing electromagnetic interference. The quality and quantity of the inductor will affect the sound quality of the output sound. Sinbosen uses imported inductors, and the size and quantity are better. From the actual audition effect, we found that 4-1800 is the same as Sinbosen D4-2000 For music, the output sound of the same speaker is very different, 4-1800 is far from the clarity of Sinbosen D4-2000. The sound is very muddy.
Third, we also found that there is no relay in 4-1800. The relay is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. Therefore, it is conceivable that the safety of circuits with relays is greatly increased.