I also have the 78 version of the Miyajima Spirit and it has the same highly magnetic pull that andysf mentions. It's just reflective of the strength of the internal magnet and is completely normal.
The Spirit sounds fine as is and I've never felt the need to use a demagnetizer. Of course, your experience may vary.
The Spirit sounds fine as is and I've never felt the need to use a demagnetizer. Of course, your experience may vary.