Skip, the 130 watt rating on your 4306 is in fact the "real wattage", as required by law(FTC)for advertising of amplifier power. Except in the highly unlikely circumstance that you're exceeding its limits and the 4306 is now audibly distorting or even shutting down, going to 300-400 watts can make no change at all, since unused headroom is simply that, i.e. unused.

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Enjoy the music, not the equipment.