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Hey all, I recently have done a subwoofer install on my elantra and have encountered some issues. I did the big three upgrade with 1/0 gauge wire to beef up my grounds and power wire running from my alternator to the battery. And ran a 4 gauge power wire to the back of the car and installed a 1200 watt monoblock skar audio amplifier. With a 12inch skar EVL sub pushing 1250 watts rms. To attempt to get a input signal for my amplifier from the stock head unit I installed a LP7-2 line output converter. I didn't want to tear apart the dash so I tapped into the rear door speakers back to the line output converter. When I played music I was only getting a max output of .335 volts out of the line output converter to the output rcas. A healthy input voltage for the amp would be around 2 to 4 volts. So I measured the direct voltage coming from the head unit to the rear speakers to find the max output was around 1.3volts. So I ended up splicing rca ends onto the tapped speaker wires and plugged the tapped wires directly into the amp bypassing the line output converter. (Which isn't the best but was my only option currently to get any output). It worked, but when I would play music the rear door speakers would clip due to the input voltage from the head unit being shared between the door speakers and aftermarket amp. So I ended up unplugging the rear door speakers to spare them from damage. So i currently only have the two front speakers and two tweeters running for mids and highs. Is there a voltage output source coming from the headunit for music that I can tap into that will have a higher voltage output so that I'm not running into this issue?
 

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The front channels have a higher voltage output and a flatter frequency response, the rear output is garbage. This is what I measured from my 2018 non amplified elantra gts. The factory radio starts to clip after volume 37. At volume 37 the front is 7.2v at 1khz 0db and 5.6v at 40hz 0db and the rear was 1.9v at 1khz 0db and 1.2v at 40hz 0db.
 

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