I am having an issue, I was able to set my subwoofer amp gains to the calculated 50v fine (nvx xad13) (sounds and works great), I go to set the gain on my sundown sdx 200.2 and gain maxed at the same volume I set my sub amp (same volume on the same headunit I had my last setup running on fine) and it will only read 10v on the dmm (yes set to ACV). For the life of me I dont know whats going on. The speakers play music and such, but I feel that isnt right to have the gain maxed with 4v preouts from the headunit, and I know gain isn't volume, but things dont really sound louder than my previous 95w x2 amp.