dawdler84651 t1_itwngeu wrote on October 26, 2022 at 9:05 PM

You can bend the metal part of the headband inward to regain some of the clamping force back. There are some tutorials for this online if you need a visual example, it is simple to do.

The HD600 and other models in that line of headphones are notorious for the pads having a significant impact on sound as well: if the pads have been worn-in, sound signature is noticeably impacted so you will want to look into a pad replacement, only genuine Sennheiser ones though as third-party pads don't play well with these.

angelf2704 OP t1_itwoewp wrote on October 26, 2022 at 9:12 PM

I tried it but it's very difficult to get it back :( Besided, I didn't want to destroy them. I tried the with HD 58X pads, I don't know if those are exactly the same.

AntOk463 t1_ityh7zo wrote on October 27, 2022 at 6:09 AM

If I was in this situation, I would use something to hold them more closed than they are, and have them sit like that for a day or 2, this should make the metal reform into this tighter shape and increase the clamping force. It's basically to undo what he did. I've done this for non audio products many times.

dawdler84651 t1_itwqp84 wrote on October 26, 2022 at 9:27 PM

You won't destroy the headband if you bend ONLY the metal, don't worry about it. Do it as shown in this video (but since you want it tighter just do the bending the opposite way).

I am not sure about the earpads the Drop edition of Sennheiser headphones use honestly... however I do believe the ones in the 500 series are different than the 600 ones but don't take my word for it.