I have been using a pair of these for several years in many systems to great effect
The tone quality is improved when you attach it to your
speaker cabinet and connect it to the + and – terminals.
■　Music sound becomes more natural and realistic.
■　In TV sound comes speaking more realistically
from the person’s mouth with 3D feeling.
■　Dull headphones are vividly revived.
Note 1 ; BATPURE has a characteristic of capacitor. So the resistance become infinity,
even if you check it by direct current ohms meter.
No response in the resistance meter.