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Check all grounds , battery voltage, and RCA cables Ticking noise on audio with engine running Amplifier is picking up radiated spark noise Check RCA audio cable; Install an in-line noise filter on the head unit's power wire. Check spark plug wires. 14 SPECIFICATI SPECIFICATISPECIFICATION ONON Output Power Rating RMS T-270 T-2100 T-2130 Channel 2CH 2CH 2CH Total Max Power 900 Watts 1200 Watts 1500 Watts 4 Ohm at 14.4V 0.3%THD ( RMS ) 4 Ohm at 14.4V ( MAX ) 2 Ohm at 14.4V 0.3%THD ( RMS ) 2 Ohm at