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      06-03-2007, 11:15 PM   #8
1bade92
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Drives: Ultimate Driving Machine
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If the e9x is anything like the E46, and a lot of the other BMW's their signals going to the stock amp are Differentially Balanced. Some amps ie: the JL slash series accepts differentially balanced signals as an input source. Use the stock subwoofer +'s and -'s as your input signal to a JL slash amplifier (not sure which other amps accept these signals, only have done it with these), and you can now run whatever subs you want as long as they are in spec obviously. I guess next step is finding out whether the E9x's have diff. balanced signals or not but if they do this is a GREAT option to keeping your stock HU, maintaining a hi fidelity signal, and not having to deal with a lot of the dirt a LOC or hi-lo converter produces. Worked great on several E46's we did...
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