Thanks guys. I will give Earsonics a call about it but out of curiosity, if it was moisture that was causing it, will Replacing the filters do the trick?

Hi guys. Been a long time follower of head-fi. Lately, the volume on the left ear for the Sm64 has been going lower against the right ear. I've tried different cables in the stores in HK and different sources (laptop, LG v20 and chord mojo). The result is still the same. There is a sound...