With the DEQ2496 test I just posted, I was wondering what happened to the Transporter in digital loopback mode with that unit connected (but bypassing the DSP processing). Here's what the digital path looks like for those unfamiliar:
computer server --> ethernet --> Transporter --> TosLink --> Behringer DEQ2496 --> TosLink --> Transporter DAC --> analogue (I measured RCA) Yup, that's 2 runs of TosLink - inexpensive plastic core 6' units (<$20 each) in my test case. Here's what a 24-bit Dunn J-Test looks like with the Transporter direct (I used the higher resolution 24/48 signal): 14497 The usual beautiful Transporter jitter plot. The 6 tiny spikes/sidebands are estimated as <300ps total (I think Stereophile measured 230-270ps) - nice corroboration! Now what happens with the DEQ2496 in line? 14498 Obviously quite a bit more jitter has been injected by the Behringer! My estimate looking at the top 8 sidebands suggests that the jitter level now is 2ns! Since I can just turn the digital loop on and off, I can do instantaneous A-B'ing of the sound. Even in this condition, I cannot say the clearly increased jitter is at all noticeable. What can I say, Even knowing this I'm just fine with keeping the DEQ2496 in line and use the room EQ function since *that* is audible! At least now I can say I've done an A-B test examining the effect of jitter for myself. The obsessive side of me now wonders if I should get some good glass cables, or AES/EBU cables and see if the jitter improves... Anyone with opinions on this? +-------------------------------------------------------------------+ |Filename: Through_DEQ2496_TosLink_x2_Bypass 24-48.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=14498| +-------------------------------------------------------------------+ ------------------------------------------------------------------------ Archimago's Profile: http://forums.slimdevices.com/member.php?userid=2207 View this thread: http://forums.slimdevices.com/showthread.php?t=97950 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
