inputs.text: powerful efficient amp - good amp plays true rms cea compliant bit white noise plays speakers caused likely amp not noticeable road noise no problehems far 7 months easy install bumps 4 ohm 90 rms 120rms speakers back although not use thehem bass anymore hooked 400 watt sub put hpf high pass filter take bass speakers great amp anyone looking improve sound quality loudness anyone without much battery headroom efficient power wise class heard believe class ab better sound quality creates less white noise cost using lot power car power restriction stock batteries alternators leaving class better choice since road noise music besides soft classical covers white noise medium high volumes anyways