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O2 AMP + ODAC - Page 219

post #3271 of 3567
Quote:
Originally Posted by liamstrain View Post
 

 

You had another AC/AC adapter of the correct rating, sitting around? Most are AC/DC adapters, and won't work properly. 


Honestly my friend took the amp and tried another adapter that lit up the amp (supposed to be same output), like it was working but still didn't provide sound.  So, I'm not 100% sure if my amp/dac is fried or if I just need a new adapter.

post #3272 of 3567

Can anyone suggest a good case for the O2 amp and its accessories ?

post #3273 of 3567
Quote:
Originally Posted by jseaber View Post
 

 

JDS Labs launched in 2007 with the cMoyBB, long before O2 and ODAC came about (2011-2012). At its peak, the cMoyBB sold around 10 units/day, and still remains well reviewed for an entry-level amp. cMoyBB represents JDS Labs's origin, so we keep it around for fun.

 

Customers requested more features over the years, which lead to development of the JDS Labs c421 amplifier in 2010 (pardon the old site). I resigned from my full-time engineering job in 2011 and hired Nick to keep up with JDS Labs's growth. c421 was intended to replace the cMoyBB. The design landed about 50% over-budget, and if there was a production issue to be had, we encountered it. Initial circuit board yield was around 80% (99.5%+ is normal); nearly all enclosures were off-spec; production ran months late. In other words, c421 taught us how not to manufacture a product.

 

We were as surprised as everyone else when NwAvGuy's O2 appeared later that same year. NwAvGuy had designed O2 to dominate the headphone amplifier market, and it still delivers today. I feared that NwAvGuy would review our c421 like he had other manufacturers' products, and a poor review from NwAvGuy might have destroyed JDS Labs in 2011. We were still a small DIY shop, so existing customers began asking us to build and supply O2 boards. I agreed to build a few, and we listed blank PCBs in the store.

 

Objective2 took off and has since spawned several DIY companies. This happens with any worthwhile opensource project, as some see an opportunity and jump towards quick profit. I still remember the first time I tried an O2 in my home office. It pushed my Sennheisers to levels I'd never hard before--a killer design. Since 2011, we've grown JDS Labs not around O2 specifically, but around the idea of excellent objective and subjective performance. c421's failures enabled us to become the leading O2/ODAC manufacturer.

 

So, you're asking about C5 and C5D. Neither is related to NwAvGuy's work and that's thoroughly explained in the C5 release article. It took about a year to stabilize c421 production after initial release. Meanwhile, JDS Labs grew from two guys in a basement to a multi-department organization covering 7500 sq.ft, and shipping over 15,000 items annually. C5 is the logical successor to c421. To summarize its release article, C5 is a portable amp best paired with IEMs and moderately efficient dynamic headphones. C5D is the same amplifier with a high performance DAC. Objective2 and O2+ODAC are more powerful designs in a desktop form factor.

 

Every project has unique design goals, so if you want to skip the above story:

 

  • C5/C5D
    • Developed by JDS Labs from 2012-2013; predecessor developed 2010-2011
    • Portable form factor
    • Perfect channel balance
    • USB rechargeable
    • Output power limited to ~88mW max (for IEMs, moderate efficiency dynamics)
  • O2/ODAC
    • Developed by NwAvGuy from 2011-2012
    • Desktop form factor; O2 is arguably portable
    • Amp+DAC limited to AC power
    • High output power, up to 650mW (for virtually all dynamic headphones)

 

Sorry for the long post. Hope that answers the question.

Cool, that explains a lot. Thanks.

post #3274 of 3567
Agreed. Excellent info..especially the product positioning bits.

Thx!
post #3275 of 3567

Custom o2 from jds labs came in today :D

post #3276 of 3567
Nice!
post #3277 of 3567
Quote:
Originally Posted by Netforce View Post

Custom o2 from jds labs came in today biggrin.gif



Is that Reimu from the Touhou series? : D
post #3278 of 3567
Quote:
Originally Posted by miceblue View Post


Is that Reimu from the Touhou series? : D

Yup!

post #3279 of 3567
I have a few questions, I have an iMac and I would like to know how can I connect Logitech X-530 5.1 Speaker System to the O2 Amp + ODAC Combo?

Also, which one is better? The O2 Amp + ODAC Combo or Sound Blaster Omni Surround 5.1 ?
post #3280 of 3567

the ODAC/O2 is 2 channel, not 5.1, so you are already going to be a bit more limited from that standpoint. To connect them to the O2, connect the green plug from the audio input cable to the “line out” jack on your O2 (if you got a version with RCA plugs for the DAC out, then use an RCA to 3.5mm female converter - you should be able to find one on monoprice). Do not use the black or orange plugs. Your rear speakers will not have sound. 

 

If you want 5.1 sound (surround + subwoofer), then you will need to get a 5.1 soundcard (or something like the Sound Blaster Omni Surround 5.1). 

 

As for which is "better" - with the Logitec speakers, it doesn't matter. You will not be able to hear a difference between any DAC/Amp that isn't seriously flawed. 


Edited by liamstrain - 8/6/14 at 7:34pm
post #3281 of 3567
Quote:
Originally Posted by liamstrain View Post

the ODAC/O2 is 2 channel, not 5.1, so you are already going to be a bit more limited from that standpoint. To connect them to the O2, connect the green plug from the audio input cable to the “line out” jack on your O2 (if you got a version with RCA plugs for the DAC out, then use an RCA to 3.5mm female converter - you should be able to find one on monoprice). Do not use the black or orange plugs. Your rear speakers will not have sound. 

If you want 5.1 sound (surround + subwoofer), then you will need to get a 5.1 soundcard (or something like the Sound Blaster Omni Surround 5.1). 

As for which is "better" - with the Logitec speakers, it doesn't matter. You will not be able to hear a difference between any DAC/Amp that isn't seriously flawed. 

Thanks for the help, I'll stick with the omni.
post #3282 of 3567
Quote:
Originally Posted by Netforce View Post
 

Custom o2 from jds labs came in today :D

I didn't know JDS did custom engravings, that is cool!

post #3283 of 3567

Hey guys, I'm thinking of pulling the trigger on the Epiphany Acoustics EHP-O2Di, but I'm wondering about the gain. It comes with 1x/5x, but I've read people suggestion 1x/2.5x instead. Do you think 1x/5x would be fine? I'm using ATH-A900x.

 

Also that JDS custom engraving is awesome, how did you get them to do it?

post #3284 of 3567
Quote:
Originally Posted by Medaud View Post

Hey guys, I'm thinking of pulling the trigger on the Epiphany Acoustics EHP-O2Di, but I'm wondering about the gain. It comes with 1x/5x, but I've read people suggestion 1x/2.5x instead. Do you think 1x/5x would be fine? I'm using ATH-A900x.

Also that JDS custom engraving is awesome, how did you get them to do it?

With 42ohm and 100db headphones the 5x won't be usable. Go for 2 or 2.5x. I have 1x/5x and only use 5x when I am using smartphone headphone out as source, otherwise 1x for all my headphones. I you are using ODAC then skip 5x. But if you are planning to buy high impedance low sensitivity headphones maybe keep 5x or change to 3-4x.
post #3285 of 3567

^+1

 

Don't go for 5x gain, it's unusable with those cans you'd want to use it with (distortion will kick in with a vengeance).

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