I have the three.1 in the dash now. I just got a few questions about it cuz i don't want to fry my gear. Sub level: Since i didn't use my sub preout on the JVC HU I have it going through here. Is this just the same as it would be on the headunit or is this kinda like a bass boost? Gain: what should i be doing with this? should i keep it all the way down? what does it change as far as amp settings if I use this? Sweep: Currently I have the sweep set at the lowest (40hz) is this advisable? what should the correct setting be? Lastly, how do you know when you are clipping a sub? the highest I had the sub level up was less than half way. If i put it all the way down i don't get any sub at all. My nine.1 gain is set at less than 1/4. from a scale to 1 to 10 the setting is a little less than 3. I still haven't but a DMM to it (haven't had the time) and I can't do it at my house cuz my neighbors would get ****ed! lol I'll set it with a DMM probably this weekend. hope you guys could shed a little light on this.