I don't use anything between my LCD-3s and the Cyclops and have no buzz or noise of any kind (other than the music I listen to... but that's another issue...). Even the transformer buzz was not audible through the cans. To me it sounds like he has a grounding issue, whether inside the amp where there shouldn't be one, or in his external wiring. If it's the former, he should contact Klaus. If it's the latter, he should recheck his wiring, particularly the home-made speaker tap.
Ah ok, i thought you guys that use this exact setup were using those. I guess i misread or my memory fails me from reading about it some time ago. It does sound like a grounding issue because it's buzzing without a signal going through it.