I I did my research and found these are the best for your in this price range.
I’ve owned just about every kind of headset you can think of from Sennheiser HD580’s and Grado dynamics to Stax electrostatics and even Bose noise cancelling bluetooth headsets. I really wanted to take a dip in the planar waters but was resistant due to the significantly higher price tag of the higher quality offerings. But after reading a lot online comments and watching a number of YouTube reviews, I decided to give the HiFiman Sundaras a try, despite the reputation of Hifiman build quality being less than stellar. Well, after a month of listening to music and watching movies I’m glad to say I just love these headsets. The build quality is excellent. Yes, I wish the ear cups swiveled, but I still get a good comfortable fit and can wear them for hours with no discomfort. The sound quality is remarkable for the price. Vocals are terrific. Well worth its $350 price tag.
Sounds from mix audio sources (YT, recordings etc.) sound good. It does have a fairly neutral representation of sounds across the audible range but it's not unpleasant, the bass notes are subdued but not unreasonably so. Overall I think it gives an accurate representation of the audio coming from various sources. If you were picking this to listen to a bass heavy track with pronounced or exaggerated low frequencies I would suggest picking a different head set. This does a good job of producing a broad range of frequencies evenly.
Comfort of the earcups is very important, this scores a 5/5 for comfort, the adjustments on the headband are adequate for my head size (I have a bobblehead for a skull).
My DSP source is a Motu M2, sound is OK. I think it could use some EQ but I don't have the ability to tune that with my current setup. Considering it's 32 ohm, it does require a fair amount of amplification from the M2 to drive it.
Construction of the head phones seems good, not too flimsy. I'm not sure how well these would fair as a traveling headset in terms of durability but these seem like nice studio headphones.
Nitpicky but the mini jacks it comes with seem flimsy, and initially I had an issue with one of the headphone drivers not producing any sound. I would have preferred mini XLR or some other type of more secure & reliable connection to the headphone itself.
I dock it a point for the cable & connector issue otherwise a great headset if judged from the audio perspective.
Comparable to headphones I've spent more money on for sure! I would suggest looking into getting a better third party cable setup, possibly modifying it to accept mini-XLR.
I think the Sundaras are amazing cans. I love the light and airy way music sounds through them(almost like a Grado planar, if they existed). Especially live music! The only thing I don't like about them, is the fact they don't articulate, at all, horizontally. So they don't feel like they are making a good seal, around the ear. They actually do, but I much prefer the way the 4xx's and the he-350's feel when wearing them, due to the much better fit, I can get with ear cups that can be adjusted front-to-back, as well as up and down. But that is certainly not serious enough to cause me to enjoy the way they sound, any less. In my opinion, they are worth every penny!
Great headphones overall. I bought an open-box pair to get a better price and they were in a like-new state, I couldn't tell a difference. I've had no build quality issues so far.
The sound quality is fantastic when hooked up to a proper DAC & Amp, perhaps my only complaint would be the relaxed midrange, but that can be fixed with EQ. Highs are clear, and bass is well delineated. Soundstage and instrument separation are not exceptional but are not lacking either. They're revealing enough to scale well with better equipment.
In terms of build quality and comfort, the metal build seems durable but is a bit heavy, I would say I can wear them for ~2 hours but not more than that without taking a break. The cable is also disappointing but can be replaced with a custom one. All that aside, these headphones are terrific for the price and I can recommend buying them open-box as well.