Massdrop Objective 2 Headphone Amp: Desktop Editionsearch
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Massdrop Objective 2 Headphone Amp: Desktop Edition

Massdrop Objective 2 Headphone Amp: Desktop Edition

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(123 reviews)
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Verified Purchaser
The Objective 2 headphone amp which was designed to rival or beat headphone amps costing $1000 plus accomplishes that in spades. The sound is big, clear and accurate. The dynamic impact throughout the frequency spectrum needs no improvement. It drives my AKG 812s with ease. The O2’s no-nonsense metal enclosure is not flashy, but well-built, solid and more than adequate. I bought the original when it was first introduced and I just purchased this Massdrop model. I also recently purchased the model that has the on-board DAC called the ODAC. Again, stunning value and performance. Either would be the perfect gift for any audiophile.
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no
It works if you can can come out of your source with an analog jack to 2 RCAs.
Verified Purchaser
Low Output impedance while powerful enough to drive demanding headphones (HD6xx & K712) to average level. Portable design do not harm the performance. In addition, replaceable OP-AMP let me have more fun on it.
Currently using Muse02 and found that the sound can be much more Vocal oriented, and one of my friend comment is "have the feel of listening to tube amp more than some tube amp" . Highly Recommend owner of O2 who want would like to look for new feel of the O2.
Edit: In addition, also tried O2+Muse02 to drive Massdrop Plus and IE800, which are both absolutely fine.
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I am not totally understand neither. However, my friend who solder amplifier himself did saw the schematic and told me, among the other 3, 2 are in the same direction, which is controlling the output power. The one on the rear most is for battery management, never touch it as it is not an opamp.
Peterfat
Forgot to mention, I did tried to swap all 3 opamp to Muse02, and found that the sound is so "thick"/"sticky" (sorry i don't know how to describe that feel, but it is no way i call it good after such change.)
Muse02 is not cheap even when I get it in Japan last year(2017 Mar), so better save money on just getting 1x Muse02. Cost of additional 2x Muse02 can buy you a lot of other 2channel opamp to try out, which I think you will have more fun and allow you to change opamp to co-operate with different headphone.
Notes for who wanted to run Muse02 on battery: Muse02 use more battery than the stock one (i can't remember, should be NE5532), for me it is still acceptable, charging every 1.5weeks with average 1hour listen daily.
just found the link of the designer comment about differet opamp, most are very low cost. http://nwavguy.blogspot.com/2011/08/op-amp-measurements.html
Verified Purchaser
Didn't have that high expectations on this amp but it surely surprised me with the open and accurate sound it produced. I use an Audioquest Dragonfly v2 DAC with this and they sound really good together. My main headphone amp is the Little Dot mk II tube amp which has a lovely warm sound that just flows through the songs. The O2 is a strong rival to the LD though with it's accurate but easy sound. A lovely pair specially to the Sennheiser HD6XX headphones. Definitely recommend getting it! But please fix the damn plug to an EU version (or atleast provide the possibility to get one).
Verified Purchaser
Good price, but...meh.
Verified Purchaser
It is a great headphone amplifier and it drives my Sennheiser 6xx beautifully. I would strongly suggest to go for the one with low amplification ( I could only buy the standard one and I can hardly go beyond 20% of the volume level with my Topping D10 DA ). Maybe it would better to have an attenuator instead of the switch and select among multiple different amplifications. My other concern is the 230V adapter, having us US plug. Such a thing does not exist anywhere on this planet ;)
Verified Purchaser
Coming from a Schiit Fulla, this amp, to my ears, is a huge step up. The headphones I use are the 6XXs. In short, everything sounds tighter/less sloppy, has more depth and dynamic impact, and clearer. First I noticed the improved sound stage. It kind of feels like there's finally enough room for everything to go into, compared to the somewhat congested experience I had with the Fulla. Clarity is also improved. The increase in the level of details I get is definitely audible, especially with percussion instruments. I'm not good at describing sound but these are the more noticeable differences. I used to think upgrading audio gear like the amplifier will not make much of a difference in the sound I hear. Apparently I was wrong because I am now having a much better experience with this amp compared to the Fulla. I got the Fulla because it was recommended by so many reviewers and audiophiles on the internet.If you want to see (hear) what your headphones can do, personally, I would recommend this amp to people who are starting out, and just leave the Fulla out because the o2 simply sounds so much better than the Fulla. I am going to get a good budget DAC (maybe Topping D10 or Grace SDAC) to pair with the o2, and strictly use the fulla only when I'm on the go. But I would like to see more plug options especially with the international 220v option.
(Edited)
Verified Purchaser
Sound-wise, this amp has been reviewed hundreds of times across many different places, so I have nothing new really to add there. In many ways the O2 was the amp that started it all for me. Clean power and mostly portable. Massdrop's version is built well and has lasted me quite a while with no issues. While I don't use mine as much anymore because I'm faking more sophisticated with other gear, this is still in my stable of amps and one I often recommend to those starting out. It's a Hall of Fame (IMO) as in many ways this amp made a market for high quality, sub $100 amps that now is crowded with options. Those options are newer, may look prettier on the outside, and are pushing product to a lot of reviewers out their for publicity/marketing but don't forget this guy.
Verified Purchaser
Combined with the Grace SDAC and Sennheiser HD 6xx, the sound is phenomenal and can't be beat at this price point. Definitely a highly recommended combo. The unit is small and clean looking, as well as designed to fit nicely by stacking it with the Grace SDAC. It has enough power even on the 1x multiplier to drive high impedance headphones with ease (turning the volume knob even to 50% was uncomfortably loud) and without distortion. The reason for 4 stars is: the rubber feet are of uneven height, requiring me to cut and ghetto-rig some plastic
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adhesives of varying heights in order to stop it from wobbling(also 4.5 stars wasn't an option). They can be seen below the front 2 feet in the photo, ignore the little remote on top, that's for speakers.
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Standard, its more than enough
Nik92
Hmm interesting. The combo version of this (O2+SDAC) ships with medium gain (1.0x and 3.3x). I had that combo unit previously before "upgrading" to the Aune X7S amp. I was thinking of getting the same gain option with this O2 amp.
Verified Purchaser
Depending on your cans, this could be all you need. It does the job in a clean way, and if your ego can say ” this is enough for me" you will be happy, and not go down the rabbit hole that is tube amps and rolling, and various types of as amps. I used to have bench/desk space (and money), but then I wanted to see what was better than an O2, and now I look like I'm trying to emulate Zeos, as far as how many amps/DACs I have. Get the O2 and a cheap tube pre amp, and that's all you will need unless you have stupidly hard to drive cans.
Verified Purchaser
Compelling sound as it takes depth quickly to the thickest sound possible. Hearty power!
Verified Purchaser
Works great, looks perfect on top of my Grace Design SDAC
Verified Purchaser
Best amp available under $500. This version with the power connection and input RCAs in the back is a welcome change to the original. A++.
Verified Purchaser
Balanced output is all I miss.
Verified Purchaser
The standard version is way enough to push my HD6XX. Nice choice when pushing high-impedance headphones. Usually my input is PC with software equalizer or my Sony A25, and the sound is quite satisfying to me.
Verified Purchaser
its an good amp, i forsure need an dac. but that my fault, i would go buy the dac/amp combo they make :)
Verified Purchaser
Clinical, accurate, detailed, and clean with a low noise floor. It brought back the missing bass impact to the HE4xx, but kept it’s intimate sound. The HD58x also has more bass impact, but not as apparent as the HE4xx, and the sound stage opened up more.

DAC: Topping D30 Cans: HD58x, HE4xx Cables: Mogami RCA, Neutrik soldered connectors, standard PS, standard USB Songs: Klingande, Jubel; Robin Schulz, As the Sun Goes Down - 24bit 192Khz FLAC
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Honestly, you’ll be better off with the Atom as it measures almost as well as the 789 and single ended output outperforms it. The Atom will serve you well for years and is a good $100 end-game budget amp.
Artismo
Hi Many thanks!. I will consider it, the only “problem” is the price. I found out that It’s the only one that can only be purchased in the company website (not in Amazon or Aliespress) and its shipping costs to EU are 37$. If I am charged import taxes I would end up paying 170$ (almost double the original price). I think that I will wait to test the SAP II with the 6xxs and if I’m not happy I will decide what to do. Kind regards.
Verified Purchaser
Clear sound!!
was trying to get nice sound from my pc (ASrock Purity sound 4 said to be able to drive '600 ohms') to no avail... bought this and the sound coming out, paired with AKG K7xx is very clear tonality..
comparing it to my Sound blaster G5X the output would be same if not G5X is 'stronger'. then again G5X is a USB DAC/AMP.
overall i'm liking this thing a lot for clear and i dont know... 'neutral'? sound? but anyway, this amp made me like my 'lousy' M/B sound again.
o, when i use it as Amp for the G5X, it is heaven (i like the sound from G5X).
edit: i recently got my 600 ohms DT 990Pro, it can drive it nicely. though comparing MD O2 + motherboard as DAC with a SB G5X might not be fair (hell the motherboard sound say 600 ohms, 32 bit sound and my SB G5X is only 24 bit)
anyhow, i'm not sure i can plug the MDO2 as amp for my G5X... that would be another addition to this review.
Verified Purchaser
neutral amp with silent background and plenty of power to drive all my headphones including my power hungry hifiman he400i. Great value
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I'm not following your question.
I don't have that much experience with iems. I do have the massdrop/nuforce edc3 though. They are pretty good, but only with the foam tips. Kinda similar to the 6xx, but with a bit less low bass, and a little less detailed up top. Great for mobile applications and provide good ambient isolation.
Verified Purchaser
Sounds great with both open and closed back cans. Controls feel very nice. Volume pot has just enough resistance when rotating.
Verified Purchaser
Really hate the 6.35mm socket. Replaced with 3.5mm socket. Pretty easy. But the internal components seems not as neat as original.
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GTeee
zzzit