What is Ripple?
RIPPLE is defined as the regular or irregular variations of a voltage about a fixed DC voltage level during steady state conditions. Under MIL-STD-1275B, ripple should be 2 volts or less in a 24/28 Volt system within the range of 50 Hz and 200 KHz. That's for a properly operating system!
Ripple sources are commonly the alternator system (heard as 'alternator whine' on radio or audio equipment), the ignition system, and hum generated by battery charging equipment.
STO-P Power Fault Protectors incorporate highly effective filtering to provide a very low impedence to ground. Typical values are 20 milliohms or less at 1 KHz. This extremely low impedence level removes virtually all traces of ripple from the power supply feeding electronic equipment.
An unexpected benefit of this is the tendency to improve the audio quality of communications and entertainment systems.