crackle noise at low revs

The engine has a delicate crackle noise when I accelerate at low revs.

I can barely hear only when the window is down.

So,what is it? the dual mass flywheel? can be this a normal sound?

The clutch kit and DMF have been changed 12.000 miles ago

Or maybe is a faulty ignition timing problem,the knock sensor

Edited 23 August, 201114 yr by IulianE