I hooked up an Outlaw LFM-1 Plus to Pioneer 1021-k for a 2.1 system. Sub set to gain of 5 (12 o'clock), max output, no port plugs, EQ bypass. I set fronts to SMALL, XO at 80hz. Ran MCACC calibration - fronts were auto set at 0.0 and -0.5dB, but sub came in at -12dB.
It sounded just right, the balance between fronts and sub, smooth transition, not too much, not too little bass. But all casual listening at low nighttime levels with toddler sleeping in next room (I managed to run the calibration before bedtime)