wolfetan44
Headphoneus Supremus
- Joined
- Mar 27, 2012
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Heres the O2 black guys!
Heres the O2 black guys!
Quote:Heres the O2 black guys!
Nice! It looks pretty sleek. I was going to order my O2 with a black front plate as well, but I wanted it to match the silver front plate of the ODAC so I ended up getting the standard silver one.
I must admit though, I'm not a fan of all of the O2's inputs being in the front...
hey guys, wondering where they currently stand with regards to releasing an objective desktop amp or if I can purchase an ODAC/o2 amp in the same chasis
does anyone know how many opamp the headphone out section needs? I wanted to try MUSES01 on this for the fun of it, I just dont know how many I need to buy.
There is one NJM2068 in the gain stage, and two parallel NJM4556's in the headphone buffer. However, it is not recommended to "roll" the headphone driver ICs (which were chosen for being the best for this specific application from many possible options tested) unless you really know what you are doing. It could easily make the amplifier perform worse, or even result in oscillation or other problems. It is safer to "roll" the gain stage op amp (preferably using one of the chips tested by the designer, which are known to work without problems), there is just not much point doing it.
anyone else thinks using 6.5x gain sounds so much better than using 2.5x?
I noticed much sharper sounds, more soundstage, more separtion of instruments, harder bass,
and that's me using eph-100 iem, with 128 kbps radio streaming from winamp shoutcast
Since I had gotten the o2/odac, I was using only 2.5x gain and I was completely content, until I tried 6.5x just out of curiosity and immediately noticed difference in sound.
Things just sounded like it occupied much more space and filled more air space and much more fuller, and overal sounded more airy with more pronunciation of harder to hear instruments.
At first I thought it was my ear playing tricks, but the songs that I had heard many times sounded, just alot better.
So I proceeded with experimenting with differnt songs, specifically ones with many instruments and of different volume levels.
For obvious reasons I didn't listen to skillrex or some dubsteps, because everything would sound so mushed in to start with.
I listened to some korean ballad, rnb, pop musics, even some classicals, and instruments like violin or cello that sounded like it was playing 10 ft away in 2.5x mode sounded like it was playing from 30ft away in
6.5x mode but still managed to sound louder, clearer, and fuller.
I lowered the computer side volume to about 30% so I have more room to fine tune the volume on the o2 side.
Nope. Just your normal 9-10 pm. I really thought it was the headphones falling apart (HD650), but it was the ODAC/O2 combo. I felt better when JDS Labs confirmed it was a known issue. For me, I felt the HD650 needs the dynamics of high gain; low gain is fine, and I was perfectly happy with low gain with the HD600. But if you use an Ipod line out as source, you don't have the issue becaues of output impedance of ODAC... or something like that.
I wouldn't call it an issue. To put it simply, O2 amp is not designed to be used with 6.5x gain if dac with high output is connected. (ODAC has 2V output).
6.5x gain is for sources like ipod..
More technically, on AC with 2.5x gain max input is 2.8V. With 6.5x it's around 1.1V
On battery with 2.5x it's 1.8V and with 6.5x only 0.7V.
So with 6.5x gain you are overloading the input stage of O2, which translates to clipped sound.
Nope. I read somewhere recently that the 6.5x gain actually starts clipping sound on the O2. 6.5x gain just adds excess background noise for my headphones when I used it so I just took out those resistors.
Yeah right here. I'm not 100% sure if it's true or not though:
Nope. I read somewhere recently that the 6.5x gain actually starts clipping sound on the O2. 6.5x gain just adds excess background noise for my headphones when I used it so I just took out those resistors.
Yeah right here. I'm not 100% sure if it's true or not though:
ya I remember reading several replies on that issue, that's why I was only using 2.5x, but to me things are on a completely different level at 6.5.
Do you have the o2/odac combo or do you have them separately? I think I read somewhere that may be the cause