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O2 AMP + ODAC
Apr 4, 2015 at 6:19 PM Post #4,201 of 5,671
If you're using an external DAC, use your USB port and hook it to your computer. You don't connect your DAC through optical for the ODAC.
 
Apr 4, 2015 at 8:22 PM Post #4,203 of 5,671
Apr 4, 2015 at 8:24 PM Post #4,204 of 5,671
dazzerfong said:
 
The ODAC only has a USB-mini port, no optical-in.
Click to expand...

Are you talking about the JDS labs or the link to the Modi I posted? It looks like an optical in...they make two models; one with optical in and one with USB. As for the JDS labs, well you would be right I think. Either way, I think I'll just get a dac/amp combo and say screw the soundcard.
 
Apr 4, 2015 at 8:27 PM Post #4,205 of 5,671
repevox said:
  Are you talking about the JDS labs or the link to the Modi I posted? It looks like an optical in...they make two models; one with optical in and one with USB. As for the JDS labs, well you would be right I think. Either way, I think I'll just get a dac/amp combo and say screw the soundcard.
Click to expand...

I know nothing about the Modi, all of what I'm saying applies to the ODAC.
 
Apr 5, 2015 at 10:27 PM Post #4,206 of 5,671
atoniolin said:
Dear all,
Has anyone tried to measure / compare the O2/ODAC with other setups such as Meier Audio's Classic/Daccord, or more expensive ones like SPL Auditor?
I am using the O2/ODAC from Epiphany Audio with the Beyerdynamic T1's and usually use HIGH GAIN at 12pm to 1pm and its already very loud. Sometimes I feel that the bass might be lacking though, but I'm not sure if its the real thing, or its an o2/odac weakness.
Thanks so much!
Click to expand...

 
Used T1 / SPL Auditor in past , sold auditor and switched to O² , didn't feel any lacking but i am more tolerent to lacking a bit in bass departement than having too much bass ...
 
Apr 6, 2015 at 7:42 PM Post #4,207 of 5,671
The O2 is really hard to beat for most headphones!
 
Been there done that with many other amps.....the only real thing with the O2 IMO is its mechanical build is less than stellar and the switches, buttons and plugs arent industrial strength...but these dont matter sonically.
 
The ODA I have is much more versatile, sonically about the same but with more current and lots of nice things to have to help in mucking around....clipping led, power leds, RCA jacks etc.
 
Alex
 
Apr 6, 2015 at 8:12 PM Post #4,208 of 5,671
I dunno - The jacks DO matter sonically when the connection quality is poor.
 
A little knock or "wiggle" of the cables on the input side often cause me to lose the L channel. I find that a bit irritating at times (but seems to happen more with my 3 inch cable (a little stiff). Same with the headphone in jack - a bit temperamental.
 
Apr 6, 2015 at 10:59 PM Post #4,209 of 5,671
Question about the O2/ODAC combo units from various vendors...
 
With these combo units, especially the desktop units where the ODAC output is at the back (whether by 3.5 or RCA), is there a particular hardware or space limitations that prevent the INPUT from also going into the back as well? I love the looks and functionality of the combo units, but it's just that the inputs remaining in the front which just seems... odd to me from conventional desktop use standpoint (makes sense of course if this is a portable use, which is indeed its original design, and maybe even for studio use where inputs are frequently in the front). I ask as if it is a desktop unit, I would think that it'd make most sense to put everything to the back yet in both JDS/Mayflower units, the inputs always remain in the front... except for standalone O2's where RCA input is actually available. So I'm assuming this is basically due to hardware/space limitation, but was wondering if that is indeed why it is so. 
 
Apr 6, 2015 at 11:13 PM Post #4,210 of 5,671
k_19 said:
  Question about the O2/ODAC combo units from various vendors...
 
With these combo units, especially the desktop units where the ODAC output is at the back (whether by 3.5 or RCA), is there a particular hardware or space limitations that prevent the INPUT from also going into the back as well? I love the looks and functionality of the combo units, but it's just that the inputs remaining in the front which just seems... odd to me from conventional desktop use standpoint (makes sense of course if this is a portable use, which is indeed its original design, and maybe even for studio use where inputs are frequently in the front). I ask as if it is a desktop unit, I would think that it'd make most sense to put everything to the back yet in both JDS/Mayflower units, the inputs always remain in the front... except for standalone O2's where RCA input is actually available. So I'm assuming this is basically due to hardware/space limitation, but was wondering if that is indeed why it is so. 
Click to expand...

 
I think JDSLabs released a Special Edition before for O2/ODAC. The analog IN of the O2 is shared by the analog OUT of the ODAC with a pair of RCA jacks mounted at the back of the panel. Making the front panel clean and uncluttered. 
 
Apr 7, 2015 at 12:38 AM Post #4,211 of 5,671
I have mine called EHP-O2Di from Epiphany Acoustics in the UK. The setup is as follows, 
Back:
RCA: serves as Line In or Line Out
(when used as Line in, bypass ODAC, only use O2)
(when used as Line Out, uses the ODAC, takes input from USB, bypass O2)
USB port input for the ODAC
Power Supply 
 
Front:
Power Switch
3.5mm jack
Volume knob
Gain switch (x1, x2.5)
 
I find it pretty reasonable for my use.
However, this design does not have batteries built in, so it is needs mains power all the time.
 
Apr 7, 2015 at 8:06 AM Post #4,212 of 5,671
atoniolin said:
  I have mine called EHP-O2Di from Epiphany Acoustics in the UK. The setup is as follows, 
Back:
RCA: serves as Line In or Line Out
(when used as Line in, bypass ODAC, only use O2)
(when used as Line Out, uses the ODAC, takes input from USB, bypass O2)
USB port input for the ODAC
Power Supply 
 
Front:
Power Switch
3.5mm jack
Volume knob
Gain switch (x1, x2.5)
 
I find it pretty reasonable for my use.
However, this design does not have batteries built in, so it is needs mains power all the time.
Click to expand...

 
Sounds like a great set up, makes the most sense from the desktop use perspective. I guess it's impossible to have two input/outputs in the back, you need to sacrifice one of them in the back (or just leave one of them in the front) if you're going the RCA route?
 
Apr 7, 2015 at 8:40 AM Post #4,213 of 5,671
k_19 said:
   
Sounds like a great set up, makes the most sense from the desktop use perspective. I guess it's impossible to have two input/outputs in the back, you need to sacrifice one of them in the back (or just leave one of them in the front) if you're going the RCA route?
Click to expand...

Usually I use the USB input into my ODAC so that I can use the ODAC and O2. 
The RCA serves as Line In and Line Out depending on what is connected to them. So far, no issues. 
If I use a DAP line out into the ODAC's Line In, the output at the front will be the O2 amplified version. :)
Very happy with my O2/ODAC so far.
 
Apr 7, 2015 at 3:51 PM Post #4,214 of 5,671
Well.... yeah!!  If the jack is worn out or bad it will affect the connection and the quality of listening due to intermittent connectivity etch, but if a cheap mechanical switch is making good contact there is no real sonic difference.
 
The O2 parts for jacks are not the best mechanical choices but for a few thousand insertions they are for the most part just fine.
 
Many of us know that and use pigtails that aren't removed very often to alleviate this or just buy and use a better jack and or switch, like the ODA from AGDR does.
 
Alex
 
Apr 9, 2015 at 11:52 AM Post #4,215 of 5,671
Regarding power adapters, I am a little bothered. My unit came with a 12VAC, 500mA adapter, but I thought I have read somewhere that the minimum voltage was 13.5V (JDS?). They do recommend a 12VAC adapter nevertheless, which makes it even more confusing.
I bought a 18VAC adapter in the end but couldn't tell the difference in volume when I kept the knob fixed and swapped adapters. Is this right? Or is the 18VAC going to provide better voltage swings, slew rates, etc?
Thanks!
 
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