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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Shlushii
7
Sep 14, 2019
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Anyone know the wall outlet requirements? I lost my power cable and I don't know the amerage and voltage it requires from the wall
Sep 14, 2019
footerscag
0
Sep 17, 2019
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12VAC@220mA
Sep 17, 2019
Michael-Q
90
Sep 18, 2019
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The 220mA sounds a bit low to me but I cannot verify. Maybe 220mA on the 120V side. Granted 220mA will be plenty for most headphones. I'd look for something in the 400mA+ range. It should be said that I'm pretty sure you can get a transformer capable of much higher current and everything will be fine. Like, 12 VAC 22,000 mA would be safe to use just not practical. You can also get one with slightly higher voltage but the regulators will run hotter. Anything over 15 VAC would be unwise.
(Edited)
Sep 18, 2019
amirz
6
Sep 10, 2019
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Is there a way to get a notification when the standard gain is back in stock?
Sep 10, 2019
Evshrug
1298
Sep 13, 2019
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I heard it’s getting harder to source the original design spec parts
Sep 13, 2019
mattster625
0
Sep 9, 2019
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I just got my amp in the mail with the HD 6XX and, right out of the box, for several pairs of headphones, there is always a clicking noise and when music is playing, the music cuts in and out continuously. Any ideas what could be causing this?
Sep 9, 2019
yoda709
32
Sep 5, 2019
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Hi all, I was wondering is somebody can help me. I currently have the HD6XX(300 ohm) and was thinking of getting the K7XX (62 ohm) Would the Standard gain version work for both?
Sep 5, 2019
Michael-Q
90
Sep 18, 2019
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The important spec to pay attention to in this situation is the sensitivity. Gain has to do with voltage so the loudness per voltage is what you want to compare. K7xx have a 105 dB/V while the 6xx have 102 dB/V. Your volume dial probably won't be much different for these two headphones unless you listen to things really really loud. If the k7xx had 120dB/V I'd be more concerned but mostly only if you have a noisy source or volume imbalances between left and right channel. side note: a lot of manufactures list efficiency (example: 96 dB / mW) as sensitivity without the units so you never know which one it is. Also, since sensitivity changes with frequency it's harder to say definitively how much louder a headphone is compared to another. The ohm of a headphone becomes more important if the output impedance of the amp is high. For the O2 it is about as low as it gets.
(Edited)
Sep 18, 2019
heyang
1
Sep 5, 2019
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why this headphone amp does not work with my HD6xx. I connect the amp with hd6xx, and I use 3.5mm to 2-Male RCA to connect my computer. The problem is that I will hear some buzz noise and it hurts my ear. I bought this amp as a option. It supposed to work well together. I'm new to audio please help.
Sep 5, 2019
Michael-Q
90
Sep 7, 2019
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Do you still hear the buzz with the RCA's disconnected? It isn't uncommon for sources like computers to be noisy. If that's the case the best you can do is set the amp to the lowest gain and/or buy an external DAC. If the computer output is noisy it isn't the amps fault. However, if the buzz is still loud and clear when the inputs are disconnected, my guess would be that you have a defective product. You can also try using a wall outlet in a different room and see if things improve but I don't think that'll do much with this amp.
(Edited)
Sep 7, 2019
cansen1213
0
Sep 9, 2019
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I did exactly what you said right after i posted my comment, and yes the buzz still occurs even when its only plugged into a wall. Im getting a refund and ordering a amp/Sdac. Thank you for helping it tho
Sep 9, 2019
TS3301
2
Sep 4, 2019
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When will the 110V standard gain be back in stock?
Sep 4, 2019
Alex_Mavriplis
0
Sep 2, 2019
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I have the HD6xx headphones and bought the 120V medium gain option. My source is only my phone/laptop and did not realize that it would not be enough to drive my headphones. Can i send mine back in exchange for the Standard gain? Only had the amp for about a week.
Sep 2, 2019
nightvision93
1
Aug 29, 2019
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Hello, I purchased the HD6xx and this was an "option" to add on and thought why not at the moment since i dont have an amp. But i just realized it only gave an option for 220v standard gain and i didnt bother checking if that will work in the US (silly me). Will i need to buy another adapter for the plug? Or return the whole thing and re-order it separately with 120v? Thank you in advance!
Aug 29, 2019
Odiumdeus
0
Sep 10, 2019
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I am also having the same problem did you happen to find a solution?
Sep 10, 2019
Zerokyko
0
Aug 26, 2019
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How is it on driving the Fostex T20RP MK3 headphones?
Aug 26, 2019
EvanHinz
0
Aug 24, 2019
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Hello, I am a big noob. I have the scarlett focusrite solo connected to my computer. I plugged my xlr mic and headphones into it. I want to get The DT990s which require more output impedance than the solo can give. my question is will the OBJECTIVE 2 HEADPHONE AMP connect to my focusrite and if so how? through rca?
Aug 24, 2019
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