When I use this adapter with low impedance headphones I get a lot of background hiss and a periodic clicking. With high impedance headphones I get no problems.
- Sennheiser HD580 (300 Ohm) - Perfect!
Sennheiser PX200 (32 Ohm) - slight background noise (low level of hiss)
Sennheiser CX300-II (16 Ohm) - unlistenable (lots of hiss plus clicking)
Is there a lower impedance limit that I have breached, or might I have a faulty unit?