[InvisibleInk]

I think these were discontinued due too many been faulty after a few months. Like mine I always see these been sold as faulty on Ebay with one side not working. I purchased one for £50 with the side that I needed.

Mine is still going strong

 

[Ince]

Not all but significant unlucky ones did have faults. I see these sometimes popping up on Ebay with the same faults been sold. Maybe Sennheiser pulled them do to amount of faults.

 

[Knightsfan11]

Suggestions for EQ on these? Using them with a BTR5.