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Safe to power analogue outs with more than 5 volts?

Like hifi line drivers, that boost voltage to create circuits for better sound,, since I'm already running separate power via de-soldered r14 jumper, how much more than 5 v can I give the analogue outputs without damaging them. Do they or the pcb have a limit on voltage it can handle? My cars 4v preouts and 7v preouts make a huge difference in the sound output level and clarity.

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