I installed a skar svr 10 inch wired to 1ohm, hooked it to a nvx 1000.1 amp, set the head unit to max clean output, i set the subsonic to minimum and lpf to max, with the amp gain knob to min and bass knob to max i played a 40hz test tone and adjusted the gain using a multimeter to 28.28v (800rms), then played a 30hz test tone and adjusted the subsonic to read out 14.16v (the amp subsonic used 12db so i multiplied the unfiltered voltage 28.28 by 0.501), then played a 80hz tone and adjusted the lpf to read 14.16v too (the amp lpf used 12db so i multiplied the unfiltered voltage 28.28 by 0.501), but in the end i feel that the subwoofer is weak not putting performance as i expected, what could be the issue? (my wiring is all correct, big 3 installed with 0 gauge, 0 gauge to the fuse block and 4 gauge to the amp power and ground)