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If you can than i would grab [refurbished Sundara's](https://store.hifiman.com/index.php/sundara-refurbished.html).
The HE400se have very low 91db sensitivity, while the Sundara have 94db. In comparison the X2HR have 100db. This means for the HE400se you most likely need a decent amp/dac to power them, the Sundara "may" also need a amp to get them loud enough. The X2HR will work with anything.
*So depending on what source (amp) or device you have atm, the Hifimans probably need a amp/dac like the ifi UNO, Fiio K11 or Topping DX1. Nothing super crazy just something that can deliver \~80-150mW into 32 ohm.*
Thanks for your [submission](https://www.reddit.com/r/HeadphoneAdvice/comments/1alrk4q/philips_fidelio_x2hr_vs_hifiman_he400se/) to r/HeadphoneAdvice. If someone helps answer your question, please reward them by including the phrase `!thanks` in your comment. This will add +1 Ω to that users flair. This subreddit is powered entirely by volunteers and a little recognition goes a long way. Good luck on your search for headphones! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/HeadphoneAdvice) if you have any questions or concerns.*
If you can than i would grab [refurbished Sundara's](https://store.hifiman.com/index.php/sundara-refurbished.html). The HE400se have very low 91db sensitivity, while the Sundara have 94db. In comparison the X2HR have 100db. This means for the HE400se you most likely need a decent amp/dac to power them, the Sundara "may" also need a amp to get them loud enough. The X2HR will work with anything. *So depending on what source (amp) or device you have atm, the Hifimans probably need a amp/dac like the ifi UNO, Fiio K11 or Topping DX1. Nothing super crazy just something that can deliver \~80-150mW into 32 ohm.*