@nasirjavaid. Pioneer 80prs , p80rsII etc ,alpine 9887 etc
Use better circuitry . better components, Better D/A convertor like burr Brown . and further more they have internal dsp which helps in better sound quality with added benefit of going active crossovers
Also more tuning options like 16 band Equalizers ,high volt pre-out 5v
Which other mid range HU lack