CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS

  • December 31, 2015, 11:37:10 AM
  • Welcome, Guest
Please login or register.

Login with username, password and session length
Advanced search  
Pages: 1 2 3 4 [5]

Author Topic: ODAC Measurements  (Read 13950 times)

0 Members and 1 Guest are viewing this topic.

Luckbad

  • Official Basshead
  • Able Bodied Sailor
  • Pirate
  • ***
  • Brownie Points: +7/-5
  • Offline Offline
  • Posts: 151
    • Basshead.Club
Re: ODAC Measurements
« Reply #40 on: August 20, 2015, 04:05:56 AM »
Let me know if/when you want to measure my Mayflower ODAC rev B/O2.

We could swap and compare measurements.
Logged

ultrabike

  • Burritous Supremus (and Mexican Ewok)
  • Master
  • Pirate
  • *****
  • Brownie Points: +4226/-2
  • Offline Offline
  • Posts: 2384
  • I consider myself "normal"
Re: ODAC Measurements
« Reply #41 on: August 20, 2015, 04:14:56 AM »
I only have Anax's JDSLabs ODAC Rev B and my Massdrop O2 will probably won't be here till mid Sept.

I've read and worked a bit more with the 2i2 and I'm more convinced it will not be up to snuff to measure these devices unbalanced. I would have to come up with a way to seamlessly couple the unbalanced outputs of the O2 and ODAC to the balanced inputs of the 2i2. I will post some simple THD and IMD measurements to illustrate what I mean, along the results of other folks here and there.

The 2i2 is IMO a great pro-audio balanced interface, but perhaps a bit mediocre in unbalanced mode, like most entry-level pro-audio interfaces.

Nevertheless, I will put my measurements on the ODAC later tonite.
Logged

ultrabike

  • Burritous Supremus (and Mexican Ewok)
  • Master
  • Pirate
  • *****
  • Brownie Points: +4226/-2
  • Offline Offline
  • Posts: 2384
  • I consider myself "normal"
Re: ODAC Measurements
« Reply #42 on: August 20, 2015, 06:02:45 AM »
So here are the measurements:

At 2.0 Vrms

THD 1kHz



IMD SMPTE



At 0.4 Vrms

THD 1kHz



IMD SMPTE



Do I trust these measurements and Donald Trump? No. I believe the measurements reflect more the limitations of the 2i2 when using the Line-In and unbalanced equipment that anything else. I will elaborate in the 2i2 thread (http://www.changstar.com/index.php/topic,2693.msg78445.html#msg78445).

For now I would say that I believe best results with the 2i2 and when using unbalanced connections/equipment can be achieved with around 0.3 Vrms inputs. Balanced connectivity is much better, though unfortunately (for the 2i2) most commercial equipment uses unbalanced outputs.
« Last Edit: August 20, 2015, 06:40:09 AM by ultrabike »
Logged
Pages: 1 2 3 4 [5]
« previous next »