[Sword of Damocles]

You can get the drivers out very easily with fingers. Just grab here with your nails and pull up. It doesn't take much force.

Yesterday I noticed that DT 770 Pro X shares all of its internal parts with DT 700 Pro X, so you can swap the drivers and even use the earpads from DT 700 Pro X.

This made me try different configurations to see how they change the sound. Here are some pretty accurate measurements.

Firstly, DT 770 Pro X with DT 700 Pro X earpads. This gives you full, spacious and relaxed sound, but vocals can sound a bit recessed and dull because there is a hole in upper mids. Treble I didn't find too bright anymore, but you could lower it 3-6 dB by using the thicker foam disk from DT 700 Pro X.

When you swap the drivers, foams and earpads, you pretty much get DT 700 Pro X, which is very interesting. The internal cup structure between DT 700 Pro X and DT 770 Pro X seems to be almost identical, so no surprises here. Beyerdynamic could have made the headphones identical if it wanted to do so.

But with the DT 770 Pro X stock pads the driver from DT 700 Pro X wouldn't sound good. This probably caused the need to change the driver, as otherwise there would be nasty 2,5 kHz peak and even less lower mids.

 

[RuslanG]

Adding one piece of kitchen roll in front of the drivers as well as closing 75 percent of the bass ports with tape gives you good results.

Something confuses me is this “drawdown” of low mids frequencies

 

[Sword of Damocles]

Something confuses me is this “drawdown” of low mids frequencies

Traditional (old) closed-back designs with a bass port seem to behave like this, but the location and depth of the dip in DT 770 Pro X is not very optimal in stock formation.