I thought my first pair was faulty so I exchanged them. Now the second pair is showing the same faults.
It's not necessarily from the base, but some frequencies make them distort.
I use the volume really low, 1, 2, or 3 bars out of the 16 my macbook has. Never ever passed from the middle (8 bars)...
It is unlikely, but it is possible that both units were faulty.
Nevertheless, besides the PK3's my other option are the apple earpods..