bigshot
Headphoneus Supremus
No it is just one parameters, which is why I said everything else being equal. You can have a nimble transducer, but if you have a poorly designed magnetic circuit and introduce local modes, then distortion is assured. If you have two of the same design with the same distortion issues, the nimble one will be more transparent in spite of the flaws.
Then this is something manufacturers should be doing R&D on. It probably isn't something a consumer can use to make a decision which product to buy.
Why is it so?
Because once something is transparent if it's transparent by a yard, it's the same as something transparent by a mile. If human ears can't hear a difference, it's transparent. The measurements may be different, or the theory might be different, but the sound is the same. It can't be more transparent than transparent.