Discussion around Insane Audio's super awesome new JL3001 for your JL Wrangler or JT Gladiator!
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If you plan on using preamp outputs I will suggest hooking up a ground loop isolator directly to the head unit first. It took me awhile to troubleshoot alternator whine after installing in amp. Always check the ground first but after that I don't believe the preamp outputs coming out of the head unit are quality parts. Alternator whine is gone now.