I spoke to the English agent who sells the SLX200. He looked up some specifications on the LFD zero III and told me it being a Class A/B should pose no problems. I told him that some Harbeth forum members cautioned me to be sure the LFD can be connected to a netrik/high level. His reply was that he saw no reason to be concerned.
I was told that the UPS carriage (freight charge) to ship from England to where I live in the United States would cost $250 pounds. He offered to check with a private shipper in Great Britain or Ireland that may be less expensive. On top of the carriage there would also be USA import tariffs. Hearing this discourage me and I decided to look around for a different subwoofer that can be purchased in the United States.
And so I did...
Now I would like to get either the REL T3 for $598 (USD)
http://www.sumikoaudio.net/rel/prod_t3.htm
or a REL T2 for $798 (USD)
http://www.sumikoaudio.net/rel/prod_t2.htm.