Massdrop Objective 2 Headphone Amp: Desktop Edition
Massdrop Objective 2 Headphone Amp: Desktop Edition
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Product Description
In 2011, audio engineer NwAvGuy published a blog post titled “O2 Headphone Amp,” in which he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design. Our version of NwAvGuy's famous O2 amplifier, the Objective 2 Desktop Edition features updates based on feedback from the community Read More

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Opus4
0
Feb 20, 2020
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The Massdrop Objective 2 headphone amp w/ standard gain is out of stock. Will you get more? Can I place a backorder?
Feb 20, 2020
Bobah
0
Feb 6, 2020
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Hey so I just got this and my 6xx's in the mail and realized I don't have any cable to connect the amp to my pc. Does anyone know the exact cable I need to connect it to my pc?
Feb 6, 2020
Bobah
0
Feb 11, 2020
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Hey so I finally got all the cables I needed and every time I connect my headphones to the amp I just get a frequent popping sound and it doesn't go away. Is there anything to do to fix this or is my amp just defective?? Please help
Feb 11, 2020
Michael-Q
123
Feb 12, 2020
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I made a headphone amp in the past that made a sound popping but also music played. It was a capacitor or two being pushed far past its rated voltage in the power supply circuit which basically failed/fried. But who knows what's really going on with your amp. I believe O2's are hand soldered so mistakes can easily be made. A few other post below you seem to have similar issues. I assume you have the right ac/ac adapter for your country (110V US or 220 EU) granted round hole square peg issues if you got the wrong one probably. Other than that I hope you can get your unit replaced. I don't think you're responsible for doing any board level repairs because of factory defects. Someone also mentioned sometimes the headphone jack might be the issue with the solution of trying to insert the plug a tad deeper but ofcourse don't try too hard and break something (original post dec 3 by chadxue) seems like a long shot.
(Edited)
Feb 12, 2020
Chriswfal
0
Jan 31, 2020
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Just got this with the HD6xx and when I plug it into my computer with a RCA to 3.5mm adapter I get no audio to my headphones. Anybody know how to fix this?
Jan 31, 2020
wisenlucky
0
Feb 4, 2020
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I just got mine and same issue but with usb. Light is on but no audio. But my iMac sees the sdac
Feb 4, 2020
WrickyB
16
Jan 27, 2020
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Does this version have the space and terminals for the 9V batteries?
Jan 27, 2020
tieuhuynhtrieu
6
Jan 16, 2020
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I need 110v :((
Jan 16, 2020
tieuhuynhtrieu
6
Jan 27, 2020
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Out of stock
Jan 27, 2020
NEXONUS
45
Jan 27, 2020
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My bad, the 110V 2.5x/6.5x gain version is indeed out of stock
Jan 27, 2020
Weud
0
Jan 9, 2020
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Looking for some help here. I bought this (220 V - Standard Gain ) alongside the Sennheiser HD58X. When I power on the amp and connect headphones to it, all I get is non stop popping. This happens reguardless of amp being plugged into my PC, DAC or into nothing.
Jan 9, 2020
ashroom
0
Jan 3, 2020
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There seems to be 4 AC adapter/Gain options. Can someone point out the differences? Thanks in advance.
Jan 3, 2020
Michael-Q
123
Jan 4, 2020
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Each version has 2 gain settings to help set the appropriate gain. Having too much gain is bad because you're also amplifying noise which may become audible (plus can be slightly more dangerous). Having too little gain will result in things being hard to hear. I'd go for the 1x/3.3 gain version unless you know your source is a weak low voltage signal. Chose the AC adapter appropriate for your country. US is basically on 110V-120V AC grid while EU and many Asian countries use 220V-240V AC grid.
Jan 4, 2020
myAWEisAureal
0
Dec 30, 2019
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Hi guys, I bought the 220V version of this as a combo with the 6xx on Black Friday. Problem is that I live in the EU where the grid operates at 230V/50Hz, while the power adapter that came with the O2 Amp is 220V/60Hz. I asked Drop support already, but they're absolutely useless ("we don't know"): can I just use a regular US/EU-plug travel adapter? Or do I need some more specialized piece of equipment to convert it? Honestly, I thought they'd be able to send a replacement unit that does 230V/50Hz, but no luck. Or if someone can post a link to a power adapter that works with the O2 Amp for the EU. Thanks.
Dec 30, 2019
Michael-Q
123
Jan 5, 2020
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AC/AC adapters are purely passive devices. The 60Hz printed on it is almost meaningless. You feed it 60 Hz it outputs 60Hz. You feed it 50 Hz it outputs 50Hz. You feed it 240 Hz it outputs 240 Hz. The important information on the adapter is 220V AC to 12V AC and whatever the output current rating is (the higher the better but has massive diminishing returns). Sometimes instead of printing the current rating it just has the power rating - and once again the higher the better but diminishing returns. The frequency difference isn't really an issue for the O2. The ripple voltage on the capacitors before the linear voltage regulators is just a little less with 60Hz than 50Hz. The voltage regulators have 80dB or so PSRR shrinking the ripple by like 10,000. The OP amps (which the O2 uses purely), also have about 80dB PSRR (power supply rejection ratio) which basically means it's impossible to hear the difference between 50Hz and 60Hz being supplied. I'm not even sure if it's possible to hear the ripple in any scenario. If anything you most certainly don't hear a difference between a 50 Hz ripple and a 60 Hz ripple.
(Edited)
Jan 5, 2020
Qwervy
214
Jan 5, 2020
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Depends on how the power adaptor works. This shouldnt matter as most power adaptors don't care about frequency. The rectification ends up with it as DC voltage anyway and anything prior to that is usually transformer which just needs some form of AC to function with a wide frequency acceptance.
Jan 5, 2020
CloudOnStreet
0
Dec 30, 2019
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Hey there, I'm still a beginner when it comes to professional audio. I wanted to upgrade, bought the 58x with the O2 amp. If I'm not mistaken, the O2 and the headphones are not enough to run the headphones, I'll need to get the digital to audio converter. I've been searching on websites and have a concern, is the DAC important when it comes to good/professional audio, or a $15 will do just fine?
Dec 30, 2019
Michael-Q
123
Dec 31, 2019
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It might be important. For me plugging into my computer motherboard I heard a tiny buzz with sensitive headphones. I'd be shocked if a $15 DAC can do better than my motherboard. To make the O2 work you need to feed it an analog signal into the RCA jacks in the back. A DAC (digital to analog converter) can do that a long with the cable (often sold separately). You can enjoy using the O2 without a dedicated DAC if you plan on using it with a computer or any other device outputing analog. It's probably analog if it has a 3.5mm or 1/4in jack. You just need to buy a 3.5mm TRS (or 1/4in TRS) to RCA cable. I'd do that and see if that's enough to satisfy you. I wouldn't buy anything less than like a Topping D10 DAC for $70'ish or the $80'ish Grace Standard DAC.
(Edited)
Dec 31, 2019
raansire7
522
Jan 29, 2020
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Get yourself a Modi 3 if you can. It's only $99 and could be your only DAC and you wouldn't be missing a lot. You really need a clean DAC for the O2 amp. Do not skimp on it.
Jan 29, 2020
AdrianL
118
Dec 11, 2019
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I have this already but got bitten by the upgrade bug, and am looking at magni heresy, magni 3+ and atom. Are these an upgrade from objective 2?
Dec 11, 2019
Michael-Q
123
Dec 18, 2019
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In my opinion not really an upgrade unless you need more power for some reason. Sound becomes audibly transparent in the realm these amps operate in. The vast majority of DAC's will be the weak point - not the amp. And with that said, hearing differences in DAC's is also like impossible. All good designs.
Dec 18, 2019
Evshrug
1552
Dec 18, 2019
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Sounds like you need a stylish new wallet... https://www.trayvax.com/collections/wallets-all
Dec 18, 2019
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