I own a pair of Sennheiser PXC 360-BT, which are the same as the MM 550-X but without microphone, very advisable multifunctional cans with good sound fidelity; though I'm afraid you are using noise cancelling correctly. Indeed it doesn't work superbly.   I don't have more noise-cancelling...

Quote: Same issue here. We need a fine DAC chip.

Well it really depends on the amplitude of the signal coming from your audio source device. Smartphones won't blow your ears, but the PXC 360 BT don't have extraordinarily big driver units so I guess their impedance should be small enough to play nicely when using only the cable. I mean, you...