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Message: <blockquote data-quote="happe626" data-source="post: 7127868" data-attributes="member: 551977">Not sure what make or model is your amplifier, but for my JBL BP1200.1 there is a 4 channel input for a mono output.  Apparently this amplifier uses a differential type input so the input won't be sensitive to  front-to-rear fader position. Use of this feature requires that all four inputs are connected to the source unit as labeled on the amplifier (front, rear, right and left).In summary, if you have a strong input rca signal then your amplifier should be able to produce full power with only 2 channel input.  If you have a weak rca signal, use the Y-splitter. The gain settings are different with Y-splitters and without.<a href="http://img822.imageshack.us/img822/3669/dsc02148y.jpg" target="_blank">http://img822.imageshack.us/img822/3669/dsc02148y.jpg</a></blockquote>

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