Just curious. I had my system tested a couple weeks ago, it measured 137.7DB. I think it'll go louder if I get a new alternator but it shuts down if I turn it up too high because it's not recieving enough power. I also adjusted the output voltage from my deck (turned it down to 4V from 5.5V), now it's shutting down less at high volume. I'm kinda new to car stereo but I have a friend who's really into it - I'm just curious how other people's systems measure and what equipment was used.