no bass (s2 mk2)

Hello guys !

I got a new problem with my Kontrol S2 mk2
When I play a track in any deck, THERE IS NO MORE BASS !
The song play like if there is a low-cut.

But there is a mystery :
When I record the song when I mix : no bass (speakers connected to the S2)
BUT when I play the record on iTunes : bass (speakers connected to the PC)

- no filter effect
- no low eq down
- I precise that yesterday i got bass with my s2
- When I connect the speakers on the "phone" port, I got bass but on the "MAIN" port no bass

thx to help me ;(

What speakers are you using? Did you try using different audio cables?

sorry for the long time to answer. My speakers are Panasonic SA-PMX5 but it's not a problem from the speakers beacause I got bass at the beginning, but sudently one day they were out.

Yes I try the connect with the RCA and it work good. I try to connect my headset on MAIN too but the bass still not here.

Do you think it's a problem from the Kontrol ? or just Traktor ?