The myth of head unit power ratings
Car Stereo deck power is very deceiving! Many head units have HUGE power ratings on the Boxes or right on the front of the units! The highest head unit power I have ever actually tested was 13 watts (at a half way decent THD)… So even if the head unit says 35Watts or 40 watts per channel on it don’t ever expect for it to really be more than 15! Just cant happen!