My problem start after I replace power supply with 12V 5A power supply.
It worked normal for 3 days.
After that I need to install that speaker on different computer, and I installed audio driver on that computer and plug the speaker in. And the problem started. Front right speaker emitting no sound . I turn knob to ~75%, it emit low sound. Turn knob to max, no sound again. And when I turn volume knob, it emitting zipping & crackling sound.
I have change the power supply with spec I find on youtube, power supply with laptop power supply that have output rating 19V & 4,7A, still having same problem. I already tried with other Logitech z506 front speaker that functioning normal, same problem.
Now, I still checking continuity around front speaker route on the soundboard. No blown caps.