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He said input level…. Not crossover…. So the previous answer is wrong. If you are running it with a factory system by splicing into the speaker wires, that would be a (speaker or) high level input. If your input is from RCA terminals on the back of your head until, that would be a low or line level input. Be careful that you don’t introduce distortion when setting the gains.
Sorry, there was a problem. Please try again later.If running a sub with a mono amp set it to low. High is for smaller speakers like 6 x 9's. Google High/Low pass filters.
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