laboratory audio headphones

Hi everyone .
I would like to buy new headphones, or at a good price on the used market, it depends on the price.
the characteristics must be maximum transparency and no coloring, assuming it exists with these characteristics. practically a laboratory headset to be used to carry out experiments and modifications on the casings.
all this because I want to make an auditory comparison between a neutral sound transmitted by the headphones (which in my opinion are suitable for this purpose. Otherwise I wouldn't know what to use) and the one that comes out of the casing from the speaker (K12 prototype).
the aim is to understand what the defects of the K12 (cabinet) are in order to eliminate or limit them as much as possible to obtain maximum sound quality.
if the headphones also work as a soundproofer to protect my ears I get another important function, so I can use it when I sweep with REW.
I don't know if headphones with these characteristics can also be used to listen to music.
I use a laptop connected to the E-MU 0404 USB sound card.
The card has a headphone output, is it possible to use that directly?
the one below is a link inserted by me and is related to the same topic:
https://www.diyaudio.com/community/...strengths-and-weaknesses.412726/#post-7694471
I will also follow the other advice received but the first and simplest step is the headphones.
bye thank you .
 
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Headphones and speakers are like cats and dogs, they are both pets but are nothing alike. Evan if you match the frequency response there are so many other factors of physics that your ears could never hear them sound alike. It is a very difficult task to tune a speaker without a reference speaker you are targeting right next to you.
Bill