Donât you may heavily damage the sound quality
I have a Sundara and a HE560v4 (from adorama). I like both of them, first obvious thing is the build - the Sundara is all metal and has the leather suspension strap headband, the HE560v4 has more of a typical hifiman build like the he400se or he6v2.
The Sundara is a little bit easier to drive so at same volume setting will be louder. The Sundara to me is really resolving, everything sounds super crisp and you can hear alot of detail and separation of instruments, and its a bit brighter neutral, feels like it extends more in the treble. The HE560 to my ears sounds warmer, has more bass, sounds full and rich, but may be a little less resolving, less crisp (but still great like a planar). On my HE560 I swapped out the stock grille with a fabric mesh grille that opens it up quite a bit which I think makes the soundstage bigger and maybe more airy than the Sundara although the Sundara is not bad on soundstage as wellâŠ
I think Sundara probably is a little more comfortable because of the suspension strap, but I do like the reflective glossy dark navy and black finish on the he560, and its comfortable enough if you have ever tried one of these hifiman headbands.
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Question what do you use with your Sundaras?
Ivâe tried them on two setups, an IFI zen stack (Zen DAC + Zen Can) and a topping stack (D50s + E30) Via 4.4mm balanced.
Gotta say i like them way better on the Topping stack, the âcleanlinessâ suits the neutral sound signature of the Sundara.
One thing i gotta say i was kind of surprised at the amount of power they want, while my T60RPs want more its still a respectable amount.
@Naturallymorbid I use the topping e30 and Asgard 3 and I like that, but have recently added just a touch of low end with the Schiit Loki mini. (a little at 20 and 400 Hz)
Just listened to a list of female vocal ballads last nightâŠheavenly! The Sundara is a bit
more forward in those mids and really brings those lyrics out cleanly. They do like a little more capable power and I noticed a big improvement with Asgard over the previous Atom amp which has power, but was a little sharp and edgy in comparison. I run the Asgard at 10 to 11 oâclock on high gain with Sundaras. Sweet! (noteâŠabout 2 oâclock with my DT 880/600.)
totally agree about mids along with the Sundaraâs wide sound stage really gives it a unique âtasteâ.
Ya that looks pretty similar to me. For me the Sundaras are at 12 oâclock on high gain (compared to the T60RP which are 1-2 oâclock on high gain).
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Honestly Hifiman should at lest label the version of sundara by year.
Just got back from the audio store and was able to A/B the 2019 copy and the new one from this year that the boss just got a demo unit a week back and just finished the 100hr burn in.
The difference is like night and day. The new sundara is more HE400i like in tuning with a more natural warm V shape tonality and much better upper treble control in the upper treble. The 2019 sundara in comprison is much lighter in terms of vocal weight and the bass slaps like wet paper.
Overall a much needed improvement but hifiman should at lest label the sundara by year if they dont want to give a revision number.
Yeah I agree. There is a workaround, though - any Sundara owner can email hifiman with their serial number and ask if it is the 2020 silent revision model.
i was only aware of 2 revisions, the âoldâ one and the 2020, wasnt aware there was a 3rd revision in 2021
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Ah sorry I meant the 2020 pad revision! Edited
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Gave me a scare for a second 
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Interesting good to know.
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Hi, my new Sundara (2020) has a slight loose connector on the right side. I can wiggle/slide the connector in and out for about 1 mm if the plug/jack is in place. It clicks good and firm into the connector, but the connector on the right side has somehow a bit more sliding room/play in and outward. Is this going to be a problem or getting worse in future use?
ps, i called the dealer and they said itâs ânormalâ and wonât be a problem, because itâs the whole pcb-board from the jack thatâs moving, so, itâs not a loose contact or bad solderingâŠI think itâs still bad quality controllâŠ
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That is a 100% bullshit answer. Return it for a replacement or get your money back and buy a headphone that you have at least some kind of assurance that it wonât break the first time you use it or be broken right out of the box.
This is why I wonât buy a HiFIMAN product anymore. I got lucky with my Sundara; The right side connector was deflective on mine but I was able to fix it. QC is non-existent with this outfit.
I got my b-stock Sundara replaced under warranty with the same issue.
I paid to send it to HifiMan warehouse in Poland (Iâm from Denmark) and they shipped a brand new one to me.
The dealer didnât even respond to my mails.
If You bought it from an official dealer and have the receipt just contact HifiMan.
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Good to know! Thx 
Still am not sure if i will go this route. I opened the right driver-housing (very easy to do) and inspected everything. All looks good and no sign of defects. The audio-jack with itâs pcb is sitting freely in a cut-out rectangular space and is hold in place by screwing everything together. itâs probable the somehow inconsistent way they drill the holes and screw in the drivers into itâs housing. In this case it has about 0.5 mm play more than the other side. Iâve put a little piece dubbel-sided tape to fill the space, and problem solved. I also checked with 2 other SundaraâsâŠsame inconsistent âproblemâ. Iâll see if its getting worse over time. Maybe iâll send it in then.
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Has anyone tried these with Hybrid Brainwavz xl?
Hi guys, do you think the new Tempotec HD V will be enough to drive the Sundara to good levels? Here is the link to itâs specs: TempoTec Sonata HD V (Android version / iOS versionïŒ â TempoTec Official Store
Do you find the M11 Plus does a good job driving the Sundara? How does the Sundara sound on it?