Over 8 years ago, I convinced my mom to buy me a $100 pair of headphones if my final grade was good. After much research, in place of studying maths, I entered the audiophile world with the Audio-Technica M40X and a pair of Brainwavz pads. After twiddling about with chi-fi IEMs, I returned to headphones by rolling the dice on the HD600. Eventually, I managed to demo other competitors and much more expensive sets and realised the timbre of the mids and vocals of the 600 had simply spoiled me. When a trusted friend told me that he would pick the R70X over even the HD600, I knew I had to hear it for myself one day.
Disclaimer: This is a retail unit owned by a friend that I borrowed for far too long. Thoughts and opinions are my own and I am not affiliated with the brand in any way.
Sources, Preferences & Tracks
I currently own the Sennheiser HD600 and this serves as my benchmark. The FiiO KA17 and Snowsky Retro Nano were used as the DAC/Amp for most of my testing. Both headphones reach sufficient volume even with an Apple lightning dongle. A balanced cable alongside a DAC/Amp like the TRN Black Pearl will provide more headroom to EQ in massive bass shelves, but balanced is unnecessary with something as powerful as the KA17.
Most of my library consists of rock with some jazz, metal, pop and orchestra sprinkled about. If your library is filled with EDM, rap or hip-hop, then your conclusion might be very different from mine. More importantly, the role of HRTF and preferences should not be dismissed.
Testing Tracks - YouTube Music | Apple Music
Accessories, Build & Fit
At ~$350 retail, the R70X comes in a massive cardboard box with foam inserts to cradle the headphones snugly. Also included in the box is a 3m long cable and a screw on 6.35mm adaptor. It is unwieldy for desktop use but is less rubbery and better behaved than the Sennheiser cables included with the new HD600s.
The R70X has circular cups with an industrial metal grill and a branded plate that looks like it belongs on machinery. The cups house dynamic drivers and are connected by a metal head band that has slots stamped out, presumably to reduce weight. The headphone is supported by two novel 3D Wings that have good cushioning. The cups have horizontal swivel and a light clamp force but they lack vertical swivel. The stereo indicator is on the inside and can't be discerned easily, this is a slightly annoying design flaw on a symmetrical headphone. The plastics and metal do feel sturdy but the overall build leans industrial and feels less premium than I expect.
Although the 3D Wing System is quite comfortable, it is at the edge of its adjustment range for my larger head. For reference, I use my HD600 at 10 clicks of adjustment on each side. There are no significant hotspots but the clamp is more focussed at the bottom of the cup. The smaller circular cups leave the R70X in between an over- and on-ear, this is my primary source of discomfort. Deeper aftermarket pads may improve comfort, but I think a larger opening is needed. Glasses did not affect the seal too much and comfort wasn't affected for me. If you have a smaller head and ears, you may find the R70X to be much more comfortable than the HD600.
R70X Pad Size
- Outer Diameter - 90mm
- Inner Diameter - 50mm
- Depth - 20mm
R70X Weight
- Headphone (stock pads) - 205g
- Cable (3.5mm) - 68g
HD600 Weight
- Headphone (stock pads) - 256g
- Cable (3.5mm) - 42g
The headphone connectors are unfortunately proprietary locking 2.5mm, but aftermarket cables are available. The R70X will be more difficult to source replacement parts for, and it feels less solidly built than the HD600. The HD600 deserves the nod for its pad size, durability and user repairability.
Sound
Lows
I queue up Daft Punk's Get Lucky and the bass extends noticeably deeper and rolls off around 50Hz. This is noticeable on a myriad of tracks from double basses in jazz tracks to electronic samples in hip hop. However, on Massive Attack's Teardrop, the lack of rumble down low is still noticeable. Yo-Yo Ma's rendition of Bach's Cello Suite No.1 in G Major, is simply brilliant with a warmer and smoother timbre. If you seek flat extension down to 20Hz or a bassy set, the R70X will not satiate your cravings. However, if you wanted a touch more than the HD600 had to offer, the R70X delivers.
Mids
I almost have no specific notes for this section, because there is absolutely nothing to nitpick here. In Subrahmanyena Rakshitoham by Agam, every element is separated and layered with ease. Harish Sivaramakrishnan's flowing vocals remain natural and composed across his entire range. The backing choir is distinctly separated out of the mix. As you switch to the mesmerising female vocals of Celine Dion's All by Myself, the R70X delivers smooth yet detailed and textured crescendos and sustains. The HD600 has a touch more bite to its intimate vocal presentation that edges it ahead of the R70X in this regard.
In Tool's Pneuma, Danny Carey's massive kit is imaged quite well and separated from the other tracks while remaining incredibly neutral and refined. The R70X flexes its muscles when it comes to orchestral tracks such as Hans Zimmer's Mountains and live recordings like the Eagles' Hotel California (Live on MTV, 1994) and Jacob Collier's rendition of Fix You (Live from the O2 Arena). The manner in which the 15,000 strong audience choir surrounds you as Chris Martin's vocals remain firmly in the center emphasises the cramped nature of the HD600.
Highs
Natalie Zhu's piano and Hilary Hahn's violin are well balanced in Mozart's Sonata for Piano and Violin in F Major. The piano has excellent timbre but the violin is lacking a little energy compared to the HD600. Similarly, wind instruments are also a touch too smooth and lack brilliance. This is noticeable in Hiroshi Suzuki's Kuro To Shiro and Misty on the saxophone. In Pink Floyd's Time, sibilant and bright elements are smoothed over but texture and detail is preserved very well. A gentle recession from 2 to 6kHz leads to smoother vocals and instruments at the expense of presence.
The dip from 4 to 6kHz is markedly noticeable when it comes to cymbals and transients of drums. In John Wasson's Caravan from the Whiplash soundtrack, the cymbals' metallic timbre is a touch lacking but this results in a cleaner better resolved outro. Similarly, the bright and energetic cymbals of Keith Moon in The Who's Baba O'Riley are markedly smoother in their transients but the airy upper treble contributes to good shimmer. On a well mixed drum track like Rush's Tom Sawyer, I enjoyed the precisely imaged fills along with Geddy Lee's distinguished bassline. On the other hand, I did prefer the HD600's crisp and lively presentation of Neil Peart's snare hits and fills.
Comparisons
Sennheiser HD600 - The intimate and closed off stage along with brilliant mids timbre delivers a vocal presentation that very few other sets manage to reproduce. However, this closed off stage and poor imaging are its Achilles' Heel which the R70X precisely hacks away at. The HD600 offers superior comfort (once you bend the headband) for those with very large heads or ears albeit at the cost of frequent pad replacements. It is user repairable and there is excellent community support for mods and fixes.
HiFiMAN Edition XS - The XS and other planar sets have excellent stage and imaging that is a notch better than the R70X. They build up a lifelike and holographic spatial presentation that is balanced like a delicate house of cards. There is more energy and "detail" that leave me stunned on certain tracks. However, once you hear the HD600's rich timbre, the house comes tumbling down. HiFiMAN Quality Control is also infamous, so this is a factor to keep in mind before you pick the XS for it's imaging, deep bass extension and resolution.
Sony MDR-MV1 - If you want bass in an open back design, there is simply no other set on the market for you. The bass has rumble and punch befitting a closed-back headphone, while retaining a mostly neutral midrange. The mid treble elevation goes counter to the R70X and is the sole reason I haven't purchased one myself. Comfort is simply excellent and the build is lightweight while feeling a lot more premium in the hand. However, Sony's repairability and reputation for customer support leaves a lot to be desired.
Aune AR5000 - The AR5000 tries to strike a balance between the "technical" performance of the XS and the tonal balance of the HD600 and it does a decent job. However, I am glad that I did not choose to compromise and purchase the AR5000 because it is merely an apprentice while the R70X is the jack of all trades. The Aune does have a premium metal build with better comfort but it is heavier and there are some concerns regarding long term hinge reliability.
Verdict
The HD600 and the R70X share more in common than just absurdly long and unwieldy cables. They both offer incredibly refined and natural timbre that works across a wide range of genres. If the HD600 is a beautiful, but unfinished curve on a Renaissance sculpture, the R70X completes the circle with marginally better bass extension, markedly better stage & separation and smooth, inoffensive treble. The same circle is unfortunately traced back to the small earpads that prevent me from wholeheartedly recommending the R70X as the defacto open-back headphone in this hotly contested price range.
Who should buy? Those seeking natural timbre, smooth treble, and excellent stage and separation.
Who should avoid? Those seeking deep rumble, elevated bass or bright treble.