You can call it bias I call it fact as the amps were on the same subs same box just different amps the audiopipe was a very hollow sounding bass my wind got hot fast with the sundown it was a much warmer deep bass subs stayed cool to me the audiopipe is just what it is a cheap amp and falls in line with others in its price range...phi have you gotten to do a direct swap out of your amp with a sundown now I hink you would understand if you did the difference is very audible...my hate comes from not ever being able my hate comes from never getting a returned call and never getting to even speak with anyone there and well then after the direct comparison it was just proof...