Speaker buzz with SS amplifier, input disconnected

Buzz and hum are two very different things. Transformer noise is hum and is emitted at the amp itself.

Since it's both channels try some easy trouble shooting for hum....
1. use a different AC line with no other sources on it.
2. only have one amp powered up and see what you get. Remove the 2nd amp from the system.

Most importantly, are you using a vertical or horizontal biamp? I'm assuming each speaker has it's own amp.

Most amps will make some kind of noise when there inputs are disconnected. When you reconnect the inputs is the noise gone? If gone there is nothing to worry about
Alan

The noise through my Blades is unchanged with inputs connected or disconnected to the Gamut monoblocks. It is more of a buzz than hum, and is audible about 3 ft from loudspeakers. Speakers are not biamped and noise persists when plugged into power conditioner, DC Blocker or
cheater plug used. Can an amplifier itself transmit buzz into a loudspeaker?
Gamut claims it must be dirty AC, but I don't believe this to be the case?
When I use my tube amplifier, no hum or buzz evident.
Thanks again to to those responding.
Brian

Audiobrian,

Buy a pair of shorting plugs for the inputs of the Gamut monoblocks. If you still have the buzzing sound heard though the speakers try plugging the amps directly to the wall outlet and then check again for buzz.

If the buzz still exists.
Which Gamut monoblocks do you have? Are the amps enclosed in the same chassis unit or entirely separate units? If the amps are housed in the same chassis unit the problem could be the monoblocks unit.

It is possible some electrical appliance or device in your home could be causing the problem. It could even be a problem somewhere in the electrical wiring like a loose connection that is slightly arcing. Only way to rule out the mains power is to hire someone with a background in Power Quality and connect a scope to the mains of your home.