It was working with my old amp perfectly fine. I just got A new amp and installed it and now this.. I don’t see any stray wire tho
If you're questioning the wire integrity you can run a bodge wire temporarily from the positive cable to the signal slot. If it turns on then it's the wire's fault or the LC2i. There's two modes on the lc2i, make sure the jumper is set to the one you want. Are you using remote turn on from the unit or a fuse to the lc2i or are you using signal sense? If signal sense you'll need to set the jumper accordingly or it will receive no signal.
Depending on how many volts are going into the amp via the RCA cables (The Input Signal) determines how much the gain is turned up. It is a multiplier of the input signal. Depending on the final impedance load (The Subwoofer Voicecoil) it may put out even more voltage. Example, my sub amp on my 2ohm sub is turned up slightly in between 1/4 and 1/2 of the way up on the gain. Other factors likes bass boost, loudness and your eq before the amp will also up the input voltage on the amplifier.
Yes, it could blow the fuse. Pulling too much current and or, too small of cable and or, fuse too small and or loose connection.
Quarter, half, full.. These mean nothing at all on a gain knob. The gain is determined by your pre-out output and the scale of your gain knob. It should never be considered being low or high because it's a multiplier. If you pump in 8v preout into the amp it may clip and destroy your equipment at the lowest gain setting. If you pump in .2V preout you're going to have to turn the gain up to max and it still won't be enough (and it'll probably get into a self feedback loop that'll blow your ears out and destory your equipment). The way to set your gain is as ThxOne described, if you can't hear a difference between clip and not clipping then use a multimeter and ohms law instead (it won't get you as much power as thxone's method, but it'll get you what the manufacturer promised on their packaging). At no point in either of these methods is the gain knob treated as a percentage of full power. The amp is a dumb device that simply amplifies a signal of varying strengths to a multiple of the original less the filters and box rise and plus the bass boost.
