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Message: <blockquote data-quote="eharri3" data-source="post: 5426565" data-attributes="member: 591579"><p>If your sub is amplified but not the internal speakers look in the head unit owner's manaul and see if there's a way to disable its internal amplifier. When I set mine I unplugged the fronts from my bridged 4 channel's RCAs but disabled the head unit's amp to turn off the rears, which go off the head unit. When I foolishly tuned my last amp using a 1000 db tone and the speakers hooked up, listening for a tone change, I got an ever so slight burning smell right before I turned it off. It went away and and everything ran fine for a couple years before  I upgraded but Im quite sure I came quite close to killing them.</p></blockquote><p></p>

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