Please help! I just conected my tannoy mSUB10 trough receiver sub-preamp RCA conector. When I turn on the sub it started to hum. I disconected RCA cable and the sub (still powerd on) stoped humming. My sub and receiver (kenwood 8030) are both plugged into same AC wall outlet. Is my interconect cable suorce of humming? Wich interconect can solve my problem? Any other advice or experience also wellcome!