Use a jl fix to convert the sound into a clean, consistent signal for the amp to use. It’s does some things a dsp does and is way better than a line out. It’s about 1/2 the cost of a dsp. A line out is nothing more than a device that converts the signal to a pre out and nothing more. A dsp will process the sound making the signal consistent, you can tell each channel what you want it to do, sum channels, eq the speakers, set time delays, set cross over points, the list goes on
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