If floating the amp gets rid of the hum and does not tear up system performance, don't worry about it. I've seen and read more than a few manuals that specifically state that it might be necessary to eliminate / minimize multiple grounds. As such, ALL of your components are grounded if just ONE component is connected to ground.
Since most designs use a common ground, your interconnects tie all of the components ( and grounds ) together. As such, grounding your preamp and removing / reducing the other grounds seems to be the logical approach. Since ALL of the components ( sources, processors, amps, etc...) are all centrally tied into the pre, that is what you would want grounded. Then again, if they can do the installation "right" and let you keep your grounds, all the better. Sean
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Since most designs use a common ground, your interconnects tie all of the components ( and grounds ) together. As such, grounding your preamp and removing / reducing the other grounds seems to be the logical approach. Since ALL of the components ( sources, processors, amps, etc...) are all centrally tied into the pre, that is what you would want grounded. Then again, if they can do the installation "right" and let you keep your grounds, all the better. Sean
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