Lifting the Ground

Is it recommended that I use a cheater plug on any or all of the three units? I have my solid state amp going into a second wall outlet. Is it recommended that I also use a cheater plug on the amp

Recommended, surley not by the manufacture.
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I don't want to come back from work and find my house burned down.

No that will not happen. What could happen if an internal ac fault or leakage were to occur in a piece of equipmemt from the hot conductor, be it a wire or a winding in a power transformer to the chassis or case, the case could become hot with repected to any other earth grounded equipment. A small leakage of current would, should, be bled off by the ics to a piece of equipment that is earth ground connected. If you do have to use ground cheaters because of ground loop hum problems and you cannot solve the problem, make sure to unplug all equipment using ground cheaters before disconnecting, or changing out ics. If a leakage is present you could receive an electrical shock.

At this moment, I have all grounds floated but two days ago I had only the cdp grounded.

Stehno, just curious about your CDP. My Arcam Alpha 9 accepts a three wire plug and cord with an IEC connector. The male connector on the CDP only has two blades for connection, the hot and neutral. No equipment ground blade for connection to the CDP chassis/case. Have you checked your CDP IEC male connector on the back of your CDP?
jim

Do you agree with Jea48 that there's little risk in lifting the ground on a high wattage SS amp?

Rockyboy, in no way do I imply lifting the safety ground on equipment means little risk of an electrical shock hazard. You the operator must weigh the risk factor. I do not have any of the grounds lifted on my equipment. My system dead quiet. I have never had a ground loop hum problem. I guess I am just lucky.
jim