I'll try to capture the effect and post. Have been busy playing catch-up from Bike Rally time off and getting ready for kids and grandkids (17 total) coming in this week for the brides birthday Saturday.
By the way, I finally figured-out the stereo's line-out adjustment and that if I turn off the 48 to 12v reducer, I loose memory of my sub volume setting. Loosing other memories don't bother me since my "defaults" are okay It's a pain to re-set the line out for it is a 2 step process (one to be done with switched power "off" and one with it "on". So, I have been leaving the reducer's "on-off" switch in the "on" position. Even though the current draw is negligible, I do worry about the safety issue. Guess since the input breaker to the reducer is 10Adc (@ 50Vdc) it should be okay? Wow, the system sounds good now! With the adjustment set to 7 (out of 10), it's perfect in the front seats. In the back seat it not only sounds good, but feels good too!