Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › O2 AMP + ODAC
New Posts  All Forums:Forum Nav:

O2 AMP + ODAC - Page 125

post #1861 of 3453
Quote:
Originally Posted by nabwong View Post

So I'm interested in getting an o2. I'm currently using the modi-vali. I'm beginning to realize that it can't drive all my headphones. Maybe only 2 of them. Is the odac necessary for me since I have the modi? Is the performance similar? I can save some money just getting the o2 amp. Any pros and cons I haven't thought of? I would have just gotten the magni but the gain seems too high that 5x. I set my PC volume at 100. Should I get the low gain mod on the o2 or just regular? I'm driving grados HF-1 and HF-2.

 

If you have a Modi, there is no point in getting the ODAC. They're both basically transparent to me and I had a hard time telling them apart.

I could probably do it with a T90 or some more expensive headphones, but not with an HD-650 or Q701.

 

O2 is definitely a better all-around than the Vali. I use mine in my bedroom with my Xbox 360 and it does perfectly for that.

 

Magni is also OK, but a tad brighter/thinner than the O2 with some headphones.

post #1862 of 3453
Quote:
Originally Posted by tdockweiler View Post
 

 

If you have a Modi, there is no point in getting the ODAC. They're both basically transparent to me and I had a hard time telling them apart.

I could probably do it with a T90 or some more expensive headphones, but not with an HD-650 or Q701.

 

O2 is definitely a better all-around than the Vali. I use mine in my bedroom with my Xbox 360 and it does perfectly for that.

 

Magni is also OK, but a tad brighter/thinner than the O2 with some headphones.

 

Thanks for your impresssions. I'm waiting to get the o2+odac this thursday or friday and then i'll be able to do a comparison. I love my he400 with the vali. It sounds really smooth but not bloated. It would be interesting to see how it sounds with the o2. My problem is that none of my other headphones (grado, AT, senns) seem to pair well with the Vali, just my opinion of course. They sound too congested. 

 

I was gonna go magni but the 5x gain is too high I think. Vali is 4x and it's already too much, maybe. So i'm looking forward to the 2.5x or even 1x gain. We'll see. I can't wait to get it. 

post #1863 of 3453
Quote:
Originally Posted by nabwong View Post
 

 

Thanks for your impresssions. I'm waiting to get the o2+odac this thursday or friday and then i'll be able to do a comparison. I love my he400 with the vali. It sounds really smooth but not bloated. It would be interesting to see how it sounds with the o2. My problem is that none of my other headphones (grado, AT, senns) seem to pair well with the Vali, just my opinion of course. They sound too congested. 

 

I was gonna go magni but the 5x gain is too high I think. Vali is 4x and it's already too much, maybe. So i'm looking forward to the 2.5x or even 1x gain. We'll see. I can't wait to get it. 

 

I had that problem too with the Vali. Sounded amazing and dead neutral with the Q701 but terrible with the HD-650. It made the mids so thick that the sound was all congested. Bass was very sloppy. I thought maybe it was due to not having enough power for the HD-650, but my 38ohm DJ100 gave me similar results.

 

Don't ask me how, but Q701 sounded better from the Vali than the O2 (slightly), but O2 is a better all-rounder by far.

 

Since the Vali only worked well with 2/5 of my headphones I swapped it for an O2!

 

So far i've only heard two other amps that are at about the same level as the O2. That's the iFi iCAN and Headroom Micro Amp. Both of those are $220-$279 though!

iCAN is great, but a tad warmer than the O2 and has a more closed in soundstage. It was good, but not great with the HD-650.

 

I use my HD-650 with the O2 almost every day in my bedroom for gaming. Perfect for that.

post #1864 of 3453

Not finished yet but you can get an idea. I chose some warmer colors this time. The power input will be moved to the back and in it's place there will be a 1/4 input (if I get it to fit). ODAC will be added later while holding the batteries (as last time).

 

post #1865 of 3453

Think I want to try an OPA2134 in my O2. Doubt the difference will be audible. Heck, I don't even currently know what parts to swap out. Doesn't it have 3 op-amps inside?

 

It'd be funny if after replacing those op-amps it'd sound 99.9% identical to my Micro Amp. That's what inside my Micro, but it has 6 of them soldered to the board.

 

Right now it's already about 95-97% identical in sound :normal_smile :

post #1866 of 3453
Quote:
Originally Posted by tdockweiler View Post
 

Think I want to try an OPA2134 in my O2. Doubt the difference will be audible. Heck, I don't even currently know what parts to swap out. Doesn't it have 3 op-amps inside?

 

It'd be funny if after replacing those op-amps it'd sound 99.9% identical to my Micro Amp. That's what inside my Micro, but it has 6 of them soldered to the board.

 

Right now it's already about 95-97% identical in sound :normal_smile :

 

I think there will be a very big different between opa2134 and stock NJM2068. Opa2134 has thick, warm, smooth sound, and not very detail, NJM2068 is totally opposite: extremely clean, clear, big sound stage, extremely detail, even swap between ne5532( 2nd stock recommend for O2) and NJM2068 i can hear the different quite clearly.

post #1867 of 3453

I just received my o2+odac. Quick question, is it just me or is there a sound difference between 2.5x and 6.5x gain. I find the 6.5x to be more congested and bloated than the 2.5x. Also more sibilance. Yes, I reduced the volume when I went higher gain. My laptop volume is 100%. 

post #1868 of 3453
Quote:
Originally Posted by nabwong View Post
 

I just received my o2+odac. Quick question, is it just me or is there a sound difference between 2.5x and 6.5x gain. I find the 6.5x to be more congested and bloated than the 2.5x. Also more sibilance. Yes, I reduced the volume when I went higher gain. My laptop volume is 100%. 

 

Yes, that's true. O2 sound better with less gain.

post #1869 of 3453
Quote:
Originally Posted by proid View Post
 

 

Yes, that's true. O2 sound better with less gain.

Thanks. Then I'm probably gonna change it to 1x/2.5x. I just got it like 30mins ago and i'm surprised it's so amazing. It's crazy for the amount of money I paid for it. Maybe will do a comparison with modi/vali. 

post #1870 of 3453
Quote:
Originally Posted by nabwong View Post
 

Thanks. Then I'm probably gonna change it to 1x/2.5x. I just got it like 30mins ago and i'm surprised it's so amazing. It's crazy for the amount of money I paid for it. Maybe will do a comparison with modi/vali. 

 

Which headphones are you using? It would probably sound less congested with 250+ ohm headphones. I find 1x is good enough for all my headphones. a900x, he-300, ahd2k, dt880 (250 ohm) and k550. 

post #1871 of 3453
Quote:
Originally Posted by AsianBatman View Post

Which headphones are you using? It would probably sound less congested with 250+ ohm headphones. I find 1x is good enough for all my headphones. a900x, he-300, ahd2k, dt880 (250 ohm) and k550. 

He400 - main pair.

Hf1, hf2, hd595, w10vtg - all of them responded the same way. Lower gain is much better. Looking forward to changing the gain. I don't foresee using the 6.5x at all.
post #1872 of 3453

6.5x was intended for low power sources, i.e. battery powered portable gear.  With a full voltage redbook level input it will distort pretty bad.

 

I found 1x was perfect for 32ohm cans, and 2.5x was about right for my 300ohm HD650's.

post #1873 of 3453
Quote:
Originally Posted by nabwong View Post


He400 - main pair.

Hf1, hf2, hd595, w10vtg - all of them responded the same way. Lower gain is much better. Looking forward to changing the gain. I don't foresee using the 6.5x at all.

 

All those are relatively low ohm headphones. I never use 6.5x before I changed it. I used it once for my dt770 80ohm and it made the bass really bloated and sloppy.

post #1874 of 3453

Don't go clipping your O2 right away because you think high gain = bad sound.

 

The 6.5x gain is still useful for HDR recordings and weak sources (i.e., virtually any common device you probably would use as a source aside from the ODAC).

 

Spend some more time listening and playing around before you do it. Better yet, plug an Mp3 player or cell phone into it with some classical to see what I mean.

post #1875 of 3453
Quote:
Originally Posted by MrMateoHead View Post
 

Don't go clipping your O2 right away because you think high gain = bad sound.

 

The 6.5x gain is still useful for HDR recordings and weak sources (i.e., virtually any common device you probably would use as a source aside from the ODAC).

 

Spend some more time listening and playing around before you do it. Better yet, plug an Mp3 player or cell phone into it with some classical to see what I mean.

 

I did try that with my TV, ipod and S3. Unfortunately that yield the same result. 

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › O2 AMP + ODAC