when you do it for a living,you kinda get a good idea of what's going on.you get what you pay for and if it's not installed correctly,the best amp in the world will not work or sound right. matching your components is critical,not necessarily by brand,but byratings i.e;the right size box for the sub,the matched rms rating(watts) for the sub& amplifier ( a 250 watt sub needs a 250 watt amp) NEVER EVER go by a "peak" rating it is, useless&unrealistic. if you just enjoy spending money and destroying subs,more power to you,just don't ask me to warranty it:rockon: