capacitor 4

semi product---- i have changed 2 solen capacitor and 1 solen coil & resisitor. improve the sound performance by 50%  I feel the sound is much more solid but not enough 通透
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i will change the 5w 2.7Ohum and copper cone which the position in the right handside.
And then i want to ask what is the function of coil ( both the left and right handside) ?