I'm going to investigate my pairs here for sure. I am seriously interested to see if all my AKGs have >0.5% THD right in the midband at levels in the mid 90s.
A very good point. A lot of people see distortion numbers and assume we both know what that means and what it would translate to in the listening experience. I am not sure, speaking for myself and I suspect quite a few "lay" members (those without technical education/ experience in the field), that is actually the case.
Well, if you are lucky to get one of them without the distortions (as shown by Robbo99999 in post #12), and use oratory90's EQ, then they are well worth their value, because of the comfort and great soundstage. In Europe they cost the equivalent of $160. (I am talking about the K702, not the DROP-version)Still, for the quality as tested, about 180€ too expensive.
One of mine does, one of them doesn't:
Still, for the quality as tested, about 180€ too expensive.
If you can have some headphones that works great with DSP, relatively cheaply, why buy some more expensive?OK, probably. Maybe the future is active, with most problems "DSP"-ed away? but this would be OT here.
Is it theoretically impossible, given enough information about the specific driver and some adaptive non-linear (deep learning?) filter?
Yes, but if you are the manufacturer you could make some kind of complete system identification and supply some software with your headphones, that could implement the DSP. You could even include some calibrated mics inside the headphones, so that the DSP could do some real-time control-feedbackIt will still depend on the measurement method. One would also have to include variables like seal, pad wear, ear shape/size etc. and above all which measurement method and targets are used.