Can I Wire Pre-Amp From Head Unit in Series

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I have a head unit with 3 2v RCA pre-amp outputs. Can I wire them in series to produce a single 6v RCA output or even wire 2 of them to make a 4v RCA output?

I'm in school to be an electrical engineer and this seems to make perfect sense to me, if I'm wrong please explain your reasoning.
 
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