Hi, Just installed a new RTP202 amplifier connected to a Pioneer 10 inch TS-SW104D speaker that is rated at 250 Watts nominal/1000 Watts Max music power. (4 ohm)The only noise coming from the speaker, regardless of the head unit or amp gains settings, is a low rumble. -Measured 12 V to amp-Zero ohms from amp ground to battery negative terminal-Remote turn on voltage is around 10 V from the Alpine CDE-9981 receiver but amp light turns on.-RCA connectors from head unit to amp are correct polarity.Thanks,Gary King-
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