E-Scorpion

I'm very disappointed of klipsch. I have the R-110SW and one day the subwoofer did not power on anymore. One varistor close to the main capacitors was exploded. Ok, I replaced the two varistors and the two main capacitors and the sub is alive again. But.... and there is always one but..... If I put mi ear very close to the speaker I can ear a noise. It's like a high frequency noise but almost imperseptible, the only way to ear it is puting the ear very close to the speaker and the noise is independet to the volume. Can you help me? Btw, after I discover the noise, I replaced all polarized capacitor in the second board for Nichicon audio grade capacitors, but the noise still here. Klipsch subwoofers are garbage.