The issue with the R-115SW amps is a design flaw where a resistor is mounted near the PCB surface and the heat essentially melts the caps around it.
I made the mistake of setting my amp to ON instead of Auto so my amp was on 100% of the time and the resistor eventually caused my caps to slowly fail. My sub goes into premature thermal shutdown at lower and lower volumes.
There is a guy on these forums Supreme Innovations who fixes these amps and has a line up of 30 of these Klipsch 115 and 112 amps to fix. All with the same core issue. He will replace all the caps, install a higher rated resistor and mount it away from the PCB and caps.
Ive now also installed smart switches on all my sub amps so they receive no power when my receiver is off. I have other power amps that went south left in auto mode also due to heat issues.
i also have an SPL-150 and have not opened it up to look at the amp to see if they changed the design at all... may have a look one day...
