hindi ba SQL = Sound Quality Level at SPL = Sound Pressure Level??

ang dapat ay ang tamang combination ng HU, speakers at amp.. anything too much will not bring you the SQ or SP you are looking for..

dapat sa sound setup eh maganda yung "Frequency Response" ng mga speakers at amplifiers para lahat nung sound frequency from your HU music eh kayang ibigay nung ampli at speakers.. branded, generic, mahal or mura na equipment dapat maganda ang frequency response para hindi ma cancel yung mga little details of the music..

consider also the size of the car you are going to install.. baka naman sa vios mo lalagay yung 100k worth of sound setup mo that i think will be too much for that car...