(This UK buyer have bought Mpingo Reso-bell Large & Small items.
He sent his review to us, and so uproad here with his permission.)
"I am very happy by the way with my Mpingo reso-Bell and I just cannot
understand how something so small can influence the sound from
my floorstanders but it does.
It must have taken a lot of research to develop them into viable
products so I applaud whoever thought of the idea.
Best regards, John. from UK 2015.1.31."