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Hi, I'm looking into getting an amp/dac for a pair of headphones that are around 300 Ohms but unsure which amp/dac to get. I've seen a lot of people on various forums mention Asus Xonar... so I had a look. Now I see there are PCI-E cards and there are ones that are outside the case like https://www.amazon.ca/ASUS-Xonar-U7-Sound-Card/dp/B00E7QA9E0/ref=sr_1_1?ie=UTF8&qid=1478563765&sr=8-1&keywords=asus+xonar . I think the ones outside the PC would be better right because of interference issues? The only thing is, what else should I be looking for when choosing an amp/dac? Why Asus Xonar over something else like the FiiO or Objective2?

Hey Guys, I recently bought the Sennheiser x Massdrop HD 6xx's. I already got a Focusrite Scarlett 2i2, which should be enough to get them fairly loud, yet a dedicated Amp will give the 6xx's a better sound overall (more defined and so on). Now I dont want to spend more than 200$. So the best Amps in that price range would be the Schiit Magni 3 Schiit Vali 2 JDS Labs Objective 2 Little Dot I+ Little Dot MK 2 (Sales not included, Massdrop may Drop some of these) What do you guys think? They probably are all great, but if some of you have hands on experience let me know. Sincerely 5chmidti

So I was wondering whether to get the multi bit modi 2 or the modi 2 uber or if I should get the o2 dac/amp. They are all in my price range and I can get any one of those but i was wondering if the multi bit could bring up possible problems? I was also wondering if the modi 2 multi bit and the magni 3 would work together as well as if the multi bit will really improve audio quality. Thank you!

Hello, I have the Sennheiser HD6XX headphones and am looking to buy a better amp and dac since I have the SMSL M2 DAC/AMP which was only $65. So I'm looking to get the Modi 2 and maybe a Magni 3 or something like the Asgard 2 or the O2 AMP + ODAC. The O2 and ODAC are the cheapest for me due to shipping and taxes, what would you guys recommend?

Hi, Does anyone have any experience with using the O2+Odac as a preamp for the JBL LSR30X or LSR305? I own the first revision of the Mayflower O2+ODAC combo without the RCA ports at the back, so I'm wondering if I could hook up the JBL LSR30X with the line out at the front. I asked this question to JDS Labs and this was their response: I honestly don't know if he's exaggerating so I thought I'd come here for some second opinions. I'm thinking of adding RCA ports to my O2+ODAC unit so I don't have to go through the hassle of unplugging my headphones every time I use the speakers. But if there isn't going to be an audible improvement in sound quality, I might not add the RCA ports, since I'm gonna have to ship it back to Mayflower to add the RCA ports and it'll take a while to get back to me. Thanks in advance

Hi all, I recently bought an Umidigi Z Pro as both their website and tech advisor say it supports the 800MHz band for 4G. I am with GiffGaff and, am I correct in thinking, that GiffGaff use the 800MHz (as they use the same one as O2) in the UK? If so, I don't know what to do. My phone is only connecting to 3G, despite me going into settings and manually changing the network operator to O2 - UK 4G. Any help would be appreciated EDIT: It just connected but then went back to 3G - so it definitely can connect but it chooses 3G over 4G - I'm even more confused now

Just got the O2 in the mail today from massdrop and hooked it up. I bought the Desktop Edition - 220 V - Medium Gain (1.0x Low, 3.3x High) to use with my AKG K7XXs. I did the math and saw that it would work with my AKG K7XXs so I jumped on this deal. Problem is when trying to use it i get this sound like a thumping that wont go away. I used three different pairs of headphones/ earbud and still get the sound. I even get the sound when it is not plugged into an audio source. Did I get a lemon or do something wrong? Does this mean I need to use a DAC as well with this AMP? I have no idea what is going on, I saw that what I got was the right one to run my headphones. Just really lost, can anyone help? I posted on the discussion on massdrop and have seen other people with this problem. Any ideas, comments suggestions, or feedback would help!

Hey, to start with, I'm from England so some of the network providers you may not be familiar with if you're from NA, which alot of people on this site seem to be. so I'm trying to sell my iPhone 6s as I got a 6s+ and I was asked what networks it worked with. Now, I assumed it was unlocked as I had 2 networks on the phone when I was changing my steam account number and needed to access my older sim. I've tested 5 Networks. (EE, Virgin, Vodafone, O2 and Giff Gaff) and only EE, Virgin and Giff Gaff work, the other 2 say it's not compatible. Just wondering if anyone could give me any advice on why only certain networks (that aren't partnered) work with the phone and others aren't compatible. Thanks

Im looking between the o2+odac or the Schiit UBER stack for my hd650 because of price. The uber stack is basically the same price so its just a matter or preference. I hear a lot about both sides but I cant decide. I also hear people say the difference is indistinguishable. Which do you think is better?

so i was planninf on getting a pair of Audio Technica ATH-AD900x but i only have my shitty on board sound with a lot of static noise so i looked into the AMP+DAC combo from Mayflower Electronics i dont know if its overkill or not im kinda new to all of this high end audio stuff my tought were that if it is very overkill i could have it forever basicly and use it for future upgrades with speakers and stuff or should i get something else??? teach me senpais

Hi, The USB port at the back of the O2/ODAC combo is moving when I give the USB cable a wiggle. My guess is that the nut and screw holding the ODAC is loose, based on the pictures I've looked up. I've actually been experiencing this issue for a while now but never posted about this since I haven't had any issues with sound (still don't as far as I know). I sent Mayflower Electronics a question about this when I first realized this and they told me it was normal. I never had this issue when I first got the unit. Does anyone else have this issue and is it something I should be concerned about? Thanks in advance.

I am thinking about buying high quality heaphones which will probably come at an increased impedance level and I was wondering if I could pair basically anything with an O2 (that I don't yet own) of if there are any restrictions.

Here is the imgur album http://imgur.com/a/eqfml/ edit : and lol 100th post @MayflowerElectronics

So this is just an idea I had.... Does anyone know if it would it be possible to get a connector for my corsair axi860 psu that would power the O2 amp through its normal power plug? The included power supply (from mayflower) is a class 2 PS with an output of 12VAC @ 200mA. What I want to do is build the O2 into the front of the computer without any external wiring (just powered by my psu, and connected to an internal USB header). The benefits for me are twofold: cleaner power for the amp, ( I get pops and crackles from power jitters in my building) and a cleaner desk. My O2 has rear power, so it would be really easy to build it into my case. If anyone has any tips or thoughts it would be appreciated. Thanks, Elliott35

Hey guys, I've had my eyes set on the Hifiman HE-500 for a while now and I've found a place where I can get a brand new Hifiman HE-500 for about 500 USD. However, it's the last one in stock, so I have to make my decision quickly. I'm currently using the Desktop Objective2 + ODAC combo from Mayflower Electronics and the Sennheiser HD 598 which I just recently picked up. I've been reading a lot of mixed opinions on the HE-500 and Objective2 combo. I've read in a few threads from Head-Fi that it takes a better amp than the Objective2 to get the best out of these pair of headphones and that it sounds better with a tube amp such as a Hifiman EF-5 or a speaker amp. I also read that the HE-500 benefits a lot from current from an amplifier and the Objective2 doesn't meet those requirements. There were many others who said the O2 has enough power and was "sufficient" for the HE-500 but didn't really elaborate on that. A brand new HE-500 for 500 USD seems like a good deal but it's still a lot of money to spend on headphones, so I wanna make sure that I'm making a good decision. If I do end up getting the HE-500, I'm hoping to be done with audio upgrades. What do you guys think? Is there anybody who've had experience with the HE-500 and the Objective2 amp? Is the Objective2 a good enough amp to pair the HE-500 with? Should I get the HE-500 or should I stick with what I have? Any help is greatly appreciated. Thanks!

Hey Guys, Long time reader, but finally decided to make a thread since I am in a pickle. Im buying an Odac along with an amp and have decided ont he SMSL sAp II: http://www.ebay.com.au/itm/110889315357?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 but I came accross this: http://www.ebay.com.au/itm/111278925841?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 Does anyone have experience with any of the two amps? Whats the difference between the sAp II and III, the internals look different but which one will perform better? I cant really find anything at all on the sAp III so I am unsure as wether it is better or not. Any help is appreciated, thanks.

How does the rear-power Objective2 get connected to your computer? What interface is it and is the port on the front or the back of the amplifier?

Hey guys, There's this deal on a JDS Labs O2 Amp for 99 bucks. There's 1 day left. Hurry up !!! Link: https://www.massdrop.com/buy/jds-labs-o2-amp I would've personally bought one, but I live in Bulgaria, and this item can not be shipped to Bulgaria.... SO MAD RIGHT NAOOO !!!

Just wondering if anything can beat the O2+ODAC combo that has a flat, realistic sound signature.

Hey Guys and Girls, I've been looking at a jds labs o2 + odac combo unit (http://www.jdslabs.com/products/48/o2-odac-combo/). My biggest question however is quite simply. Is it worth it?? I love great sounding audio but I'm not sure if the $300 price tag will be worth the difference it makes to my overall listening experience. I myself have never used a dac or amp so anybody with experience would you please help me decide if I will notice a big difference to my audio or not. Thanks heaps in advance, Hodge22

Hey guys I have an SP 2500 from corsair and a Xonar STX sound card from Asus, I am thinking about maybe getting an external amp for a new set of headphones that my friends gave me as a gift, the sennheiser momentums. 2 questions: 1. Should I get an extra amp? if I do I'll go with the mayflower or JDS Labs O2 amp. 2. If I get an amp which part of the audio pipeline do I put it in at? i.e. between sound card & speaker? or between speaker headphone passthrough jack & headphones themselves? (SP2500 has a passthrough 3.5mm jack for headphone use on the controller thing for the speakers) I'm kinda new to audio setups and I heard from my audiophile friends and the internet that an amp can make things sound much better on headphones. I just wanna know if the speaker will be a bottleneck if i try to but the amp between the speaker passthrough and the headphones, and if anyone has this setup already if the amp made any difference when using high-end headphones like the sennheiser momentums. Thanks Guys!

I grabbed myself a O2 + ODAC Combo Unit by JDS Labs for my DT 990 600ohms edition. I was wondering if there was any noticeable or even any difference at all between the Mayflower O2 + ODAC Combo Unit and the JDS ones. To me it just seems like MSI and Gigabyte making Nvidia cards... If anyone out there is able to confirm this question that would be great!

Hi guys, I wanted to take advantage of the Black Friday deals on Amazon to buy a new set of headphones, soon to be paired with an O2/ODAC. My budget for the headphones is between £100 ($160) - £200 ($320) I have selected a few on Amazon, and wanted to know which one will be the best "bang for the buck". I mostly listen to rock and metal, but also some classic. So the ones I'm looking at are these, but feel free to suggest others: Denon: (they look like a good deal, both of them) AHD1100 AHD600 AKG: Q701 (a little over my budget but seems to be a good deal) K551 K550 Sennheiser: (from what I hear they sound the same) HD558 HD598 Beyerdynamic: DT990 PRO I realize the are from different classes, and some are open and others are closed. I am looking for the best value for my money, I am used to closed headphones, but I think I would prefer open (I say think because I only tested low end open headphones). However I'll be happy to keep using closed headphones, as long as it is a good deal. Thanks!

Hi forum, bought a pair of Grado as my first non-cheapo headphones(real headphones if you would) and here's my thought on them. Packaging: The packaging is very minimal. Just a hard paper box with foam inside. There are a 3.5mm to 6.3mm adapter as the headphone default is 3.5mm. It also come's with the standard warranty paper. Le headphone: As other Grados are, the sr60i looks very retro and unsophisticated. The entire headphone is essentially black with white words saying "SR60"(without the "i" for some unknown reason) along with "THE PRESTIGE SERIES" and "GRADO LABS". It comes with a fairly thick cord and there are cords running to each side of the headphone. Non-detachable. The ear cups are made of a hard foam that conforms to the shape of your ear over time and are quite small. Although keep in mind that this is a on ear headphone instead of over ears. The housing is made of plastic which honestly does make it look cheap. On the sides there's venting holes that makes this an open headphone. Headbands on the SR60i are thin and not very comfortable. It is just a piece of metal wrapped by artificial leather(or it could be real i don't know, don't quota me on that). Technical data: I won't go deep into this as I am no professional in this area. The things you need to know is that it is an open-backed headphone which mean sound WILL leak through and you WILL hear the ambient noises. This is a sacrifice you will have to make for a clearer sounding BUT weaker bass headphone. The SR60i are of 32ohms, slightly higher than the average IEMs and cheapo headphones but is still relatively easy to drive. You will not need an amplifier to drive this headphone to higher volume. Seriously, listening at high volumes will damage your hearing.\ Sound: Test Equipment: -ODAC -O2 Amplifier (Built this myself based on the O2 so it is not really an O2. Might do a review on this soon.) Ah, the most important part. The SR60i just like most of the other Grados, sound clear and bright. Out of the box the highs sounds very harsh but after some burning in, it settles into a less irritating tone. It is still on the harsh side but is less of a problem. The mids are very clear and flat. Vocals would benefit from this as well as rock music. It does gets abit muddy when alot of instruments are playing. Details are good as you could hear pretty much everything in the music and doesn't get overly exaggerated. It's just nice. Bass on the other hand is alright. I wouldn't say it lacks bass unless you're a total bass head. What I've found is that the bass is slightly improved when amped. Overall the bass is quite solid and punchy enough for most genre. I didn't expect to get very deep rumbling sound but the SR60i delivers that quite well for an open-backed headphone. Comfort: On the comfort side, the Grado disappoints. The headphone grips on my head like vice grips and clamps on very hard. To make matters worse, I do wear glasses so it hurts me quite a bit after long periods of listening. Also, the metal bands have minimal padding to it so it will kinda dig into the top of my head after a while. The clamping issues could be solved by stretching the headphone as the manufacturer suggests but the metal band is REALLY irritating after some time. Maybe if you have thicker hair growth it wouldn't be such a problem. Also, the cables are non-detachable. Personally I don't mind that but what I do mind is that there are individual cable running off to each side of the headphone. This is very annoying as the piece of plastic at where the cord splits kept brushing against my collarbone. I might mod this into a single cord and detachable in the future. Btw, this is dubbed the most mod-able headphone out there. Google around and you can see plenty of mods for this headphone. Conclusion: So in the end, this is a very good and affordable headphone for those who are just starting to venture into the world of audiophile. At 80 bucks this is a very solid headphone that I would recommend to anyone. Although the headband and clamping issue might ward off somebody. Overall, this is a really good headphone.

Hi everyone, I just finished building my O2+ODAC unit. All the tests turn out good, all voltages read as expected. My first test was to test out the O2 itself using the audio-in jack. This test was perfect, max volume is way too loud for my ears, sound is clear, no hiss or anything like that. My next test was to test the ODAC on my PC. Running Win 8.1 x64, the ODAC is seen as soon as I plug it in. When I played something, I couldn't hear anything. Until I realized that if I maxed out the volume, I could hear the music at whisper-quiet volume. Nothing is wrong with the sound besides volume. What could have gone wrong during my build that could cause this? Thanks