Hey guys,
Just install the damping and mass loading mod on my 1770, and then the bass port sticker, which makes the port smaller. Thoughts: It seems to smooth out the tone overall. Bass is not as boomy. Vocals seem more prominent. Treble seems a bit more refined. Isolation is improved. Totally worth the 20 minutes and $11.50. Here is the link to order:
https://customcans.co.uk/s/s/index....ervice/beyerdynamic-detachable-cable-mod.html
Here is the instructional vid they made. The damping is slightly different, but not that different: there is just a circle in the middle of the back of the cup.
Really happy with these with the XL pads the I sewed (poorly), and the new mod. When music is on, I can't hear anything else in a noisy gym, and the XL gives more space and seems to increase clarity.
Note: Hard to do an A/B with 20 minutes in between, so my impressions are not totally scientific. I would need 2 pairs of 1770's side by side to be sure, but it seems that they sound better with the damping and mass loading. Not sure how to explain it, but just a bit better clarity, and separation, and maybe slightly more even, less V shaped, even though I like a V shape with good mid bass.