Wish I could answer your question as to how to measure the magnetic field, but I don't know.
Jim Aud of Purist brought a device to my home some years ago and could read all the fields in my room, including the location of wire in the walls.
He built a isolation platform that contained a shield, I assume similar to TI shield and it could be placed in between my sub and the Soundlab and get identical improvement as moving the sub. I think they were built for Japan and never marketed here.
The TI shield was at one time sold by Mike Percy. I have not tried it but assume it performs similar function.
Jim Aud of Purist brought a device to my home some years ago and could read all the fields in my room, including the location of wire in the walls.
He built a isolation platform that contained a shield, I assume similar to TI shield and it could be placed in between my sub and the Soundlab and get identical improvement as moving the sub. I think they were built for Japan and never marketed here.
The TI shield was at one time sold by Mike Percy. I have not tried it but assume it performs similar function.