best study (tutorial learning) audio gear (headphones, DAC amp)

What's the best for speed watching tutorials?

We should get a sense of price and value. If you recommend >1, rank them best to worst and give them points and ideally a price.

example: 10 model a $100, 8 model b $1

gear

1. DAC amp
2. ventilating headphones: They keep skin dry and healthy, and provide relief from non-ventilated headphones.
3. noise cancellation headphones: If your room is soundproofed, this might be unnecessary. Reduce sound sent to and received from the environment.
   1. ANC (active noise cancellation)
   2. PNC (passive noise cancellation)

What I've heard about ANC

1. It cancels white noise, but not irregular noise.
2. It sounds worse.

I have

1. FX Audio DAC-X6
2. Koss KSC75: Its better than ATH-M50X, worse than 280 PRO. It's open back and vents.
3. Sennheiser HD 280 PRO: Ignoring the closed back sound, it sounds the same as Stax SR-5 and better than KSC75, ATH-M50X, and Skull Candy IEMs.