Laptop Test

  • Subscribe to our RSS feed.
  • Twitter
  • StumbleUpon
  • Reddit
  • Facebook
  • Digg

Wednesday, 6 March 2013

MEASUREMENTS: Transporter TosLink vs. AES/EBU Behringer DEQ2496 Loopback.

Posted on 08:51 by Unknown
A little while ago, I demonstrated that the TosLink loopback with the Behringer DEQ2496 in line worsened the Transporter's jitter measurements significantly here.  Although I do not believe the extra 2ns or so of jitter was audible, I wondered if using an alternate interface than TosLink would have improved the situation. Although the Behringer doesn't have a coaxial SPDIF, it does feature the AES/EBU interface which is a digital balanced cable for me to try.

So, I got a couple of  5' Mogami W3080 + Neutrik connector cables for total ~$65 shipped to take the AES/EBU interface for a spin.

Setup: Transporter --> AES/EBU --> Behringer DEQ2496 (bypass mode) --> AES/EBU --> Transporter --> shielded 6' RCA (Tributaries brand) --> E-MU 0404USB --> AMD X4 laptop (Win8)

For the TosLink condition, I'm using 2x3' generic plastic TosLink cables instead of the AES/EBU.

Firstly, I wanted to make sure the analogue output remains good/unchanged:

The upper table contains 24/88 measurements - these days, it seems more hi-res is available in 24/88 (often SACD/DSD conversions), I figured it would be good to have a look to make sure it all measured well. The lower chart are the same conditions at 24/96. Note that these are the RCA output measurements so a little lower than with the XLR results posted before. Note that there is some inter-test variability compared to my previous results with the Transporter but generally we're talking <1dB difference.

As you can see, from the analogue perspective, there isn't any difference whether I'm measuring the Transporter DAC directly, or if it's running through a total of 6' TosLink or 10' AES/EBU through the Behringer DEQ2496.

Let us turn our attention to those pesky jitters. As usual, using the Dunn J-Test:

Transporter direct (16/44):
 

Transporter-DEQ2496 AES/EBU loopback (16/44):

Transporter-DEQ2496 TosLink loopback (16/44):
At 16/44, the Transporter is very clean for both direct and AES/EBU loopback. Most of these spikes are just J-Test modulation products  from the 16-bit signal being recorded in 24-bits. As you can see, the TosLink loopback is considerably worse with more sidebands congregated around the primary 11kHz signal. You can also see that using the TosLink interface with the Transporter slightly raises the absolute noise floor in general.

The AES/EBU loopback does add a small amount of jitter to the graph but it really is quite insignificant!

In the 24-bit domain, here are the same conditions with the 24/48 J-Test:

Transporter direct (24/48):

 Transporter-DEQ2496 AES/EBU loopback (24/48):

Transporter-DEQ2496 TosLink loopback (24/48):

These graphs look a bit different from the previous Transporter jitter measurements because I'm measuring RCA output (rather than the XLR from before which has a lower noise floor). Nonetheless, the results are the same in terms of jitter - TosLink is significantly worse.

Conclusion:
Well, I think that's it for my suite of Transporter measurements... The practical side realizes that jitter at these levels even with TosLink doesn't make an iota of difference playing real music. However, the audiophile seeks for "perfection" in as much as it's possible. Using AES/EBU digital cables instead of TosLink in this loopback configuration with the Behringer DEQ2496 for room-EQ does not add any significant extra jitter within the resolution limits of my test equipment. Cool.

Email ThisBlogThis!Share to XShare to FacebookShare to Pinterest
Posted in | No comments
Newer Post Older Post Home

0 comments:

Post a Comment

Subscribe to: Post Comments (Atom)

Popular Posts

  • Getting There... (Early HT Room Setup)
    Back from my overseas business trip late last week. It's going to be really busy since I'll be moving to the new house in 1 week. Ma...
  • Information about Internet and its Uses in Our Daily Life
    Information about Internet and its Uses in Our Daily Life How difficult our life would have been if there was no Internet. Think about it. T...
  • MEASUREMENTS: Sony Playstation 1 (PS1) - SCPH-5501 as CD player.
    I got a kick out of this article by Stereophile awhile back (2008): http://www.stereophile.com/cdplayers/708play/ Imagine, audiophiles using...
  • MEASUREMENTS: Part I: Bit-Perfect Audiophile Music Players (Windows).
    Close to a month back, after publishing my TEAC UD-501 results , someone E-mailed me about the use of  JPLAY  with this DAC. Although I had ...
  • How to Transfer Pictures from Camera to Computer
    How to Transfer Pictures from Camera to Computer Despite the significant increase in storage capacity on memory cards in digital cameras, mo...
  • MEASUREMENTS: TosLink digital optical audio cables.
    Let us now finish off testing the digital audio cables at my disposal. Already we're seen that USB  and coaxial SPDIF cables did not ha...
  • GUEST REVIEW & MEASUREMENTS: The Dr. Frank's "Best-Coaxial-Digital"™ SPDIF Cable.
    By Keaton I. Goulden-Eyre III, Esq. Two months ago, I had the good fortune to meet my independently wealthy friend Stephen at the local smok...
  • MEASUREMENTS: PCM to DSD Upsampling Effects (JRiver MC19 Beta).
    We're continuing to see a push into the DSD domain with renewed talk of music release as digital downloads requiring the purchase of a D...
  • MEASUREMENTS: Part II: Bit-Perfect Audiophile Music Players - JPLAY (Windows).
    There's something happening here, What it is ain't exactly clear. -- Buffalo Springfield Welcome to Part II of the "Bit-Perfect...
  • MEASUREMENTS: Logitech Touch TT3 Mod.
    Here's some data on my Touch with Soundcheck's Touch Toolbox 3.0 ( http://soundcheck-audio.blogspot.ca/...oolbox-30.html ) software ...

Categories

  • Apple
  • Computers Tutorials
  • FaceBook
  • Hardware
  • India
  • iTunes
  • Online Advertising
  • Web
  • Window XP Tips

Blog Archive

  • ▼  2013 (62)
    • ►  November (2)
    • ►  October (4)
    • ►  September (4)
    • ►  August (2)
    • ►  July (3)
    • ►  June (8)
    • ►  May (10)
    • ►  April (6)
    • ▼  March (4)
      • MEASUREMENTS: Sony Playstation 1 (PS1) - SCPH-5501...
      • MEASUREMENTS: Pioneer DV-588A - DVD-A and SACD "un...
      • MEASUREMENTS: The hunt for load-induced jitter...
      • MEASUREMENTS: Transporter TosLink vs. AES/EBU Behr...
    • ►  February (18)
    • ►  January (1)
  • ►  2012 (2)
    • ►  December (1)
    • ►  May (1)
  • ►  2011 (33)
    • ►  August (33)
Powered by Blogger.

About Me

Unknown
View my complete profile