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Message: <blockquote data-quote="Jepalan" data-source="post: 8152639" data-attributes="member: 655519">Use a Y-Splitter. This is the *only* way to be 100% sure the mono HU output will work with *any* amp without knowing the make/model of amp you are using and how the output is wired (bridged or normal).Your assertion about half voltage is WRONG.  The HU RCA output is low impedance and the amp inputs are high impedance.  (Very close to) the same voltage will be present at both amp inputs as would have been present at one input.Most manufacturers will tell you in the manual the best way to connect a mono sub signal for that particular amp.  It varies. But if in doubt, just use a Y-splitter.I won't profess to be an absolute expert, but I have been an electronic design engineer for 25 years and a car audio enthusiast for longer than that.  I am very open to hear other opinions on this one.</blockquote>

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