Superlux 668B Poor Bass (left ear)

[papabear01]

Hey Guys,

Just wanted to check - I facing this weird issue after picking up my 668B after a long break. Suddenly I notice that the left ear is not producing the sub 100hz bass which is more like a rattle than a sound Essentially to make the sound sound fuller.

The right ear is doing this part alright.

Any ideas how to fix this ? Fyi I use it directly on my smartphone and PC... no DAC

Also located in Hyderabad if you know any headphones repair places

 

[papabear01]

Any help would be appreciated

Tried it with a Fiio E6 old one. Issue still exists. Tried to cover the already closed vents behind the right earpads with cotton padding but nothing happened.

don't want to sacrifice soundstage by damping the ear.