Speaker buzz with SS amplifier, input disconnected

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

Thanks Attmasphere/RK
I've tried a couple of interconnects without change. I believe you are right about an internal layout problem. Both monoblocks buzz through the loudspeakers, one louder than the other, inputs either connected or not.
Would you kindly expound on the type of layout problem which might result in this speaker buzz. Can a noisy toroid transmit buzz to loudspeakers etc
I know most talk of noisy transformers in the chassis without transmission to loudspeakers.
Many thanks for your response!

The buzz is constant with balanced inputs connected or disconnected. I am using balanced cables between my VAC preamp and the Gamuts.
Thanks!......still buzzes, both channels but more on one side.

Thanks for your thorough inquiries, Tom32.
The amps have had this problem from day one, for approx 2 months but is inaudible over the music...only between tracks etc.
Actually my equipment rack is removed from the amps and loudspeakers, with a 5 meter balanced IC between my VAC pre and Gamut M250 monos.
No fluorescent lighting or dimmers.
Yes, the larger hum stays with the amp and there is apparently no change with change of room (I used a monitor speaker in room #2 as the Blades are too big to move!
I think I will send them back to a Gamut for non warranty investigation/repair.....thank you to all respondents !

It’s been quite a while but never resolved without change of amplifier. Since using VAC and Coda amps, no problem.  Thanks.