The Brickwall units do not restrict current. I bought them for 2 reasons, they don't use MOV's, and the do not restrict any current.
They are also the ONLY products out there that passed a certain test, one that didnt need to be done, but they proved they could handle it.
Go to the following link and read it..
http://brickwall.com/nofail.htm They simply will Not fail, thats peace of mind my friends.

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Play it LoUd!!