Can’t speak for other manufacturers but the reason our amps have 3 years warranty is because our after warranty service is very affordable. For instance, we can service and repair Rythmik Audio amps in house that are more than 12 years old. Currently, amps repairs after warranty for US customers cost no more than $180 including both ways shipping as we provide the box for returning the amp back to our facility in Austin, TX. All repairs are done by Brian Ding, owner and designer of all Rythmik Audio subwoofers. For overseas customers, we can sell and ship the parts needed to repair the amps and can even email instructions on how to do the repair either yourself or a local repair shop.