Quote:
Originally Posted by nick_charles /img/forum/go_quote.gif
Can you cite evidence to back up your assertion, remember where we are
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well, I said "IMO"...I don't quite have the same kind of equipment the XXhighend coder has to measure jitter...I merely use my two ears to judge on that
all I can say is that there was some files floating around a few months ago w/ different types of jitter injected to them..this was supposed to be a "live" simulation of DAC jitter, they all sounded identical tbh on my STX.
then I've ditched my Asus STX for the Asus ST(the only difference being the clock conditioner that supposedly gives very low jitter), and the difference was clearly night and day
I A/B'ed them several times(and so did several friends of mine)...and the stereo coherence was a big mess/mushy as hell on the STX and much wider/cleaner/clearer on the ST.
several ppl also modded their STX/ST w/ a much tighter clock, and said the exact same thing...but well, these are empirical/subjective tests indeed...fully agreed! and the CMI8788 DSP is spec'ed in its datasheet for a 750ps max jitter, so jitter adds up
and a lower jitter is not necessarily better, the ST was very fatiguing to my brain...too precise, too accurate..this card clearly makes you realize that uber low jitter + 124dB(actual measured) SNR is not that nice to listen to, after all.
Also, the CMI8788 DSP requires only one clock(24Mhz) so getting 44.1Khz out of it *WILL* create jitter(hence the need for a conditioner on the ST, that was engineered after the STX).
the Envy24 DSP needs two discrete clocks to operate:
SQ is not messy, not fatiguing..it's just great, with the burson discrete op-amp it just flows
still, injecting jitter into digital files needs to be run on an uber-low system..otherwise jitter adds up, you can -more than likely- hear a difference between 20ps jitter and 250 on headphones, but between 200 and 350? God only knows.
Quote:
Originally Posted by punkaroo /img/forum/go_quote.gif
I was really expecting optical to be on top, but nope!
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the italian guys who make that uber-low jitter USB interface said that optical is hopeless jitter-wise, it's on their site..check it out
besides USB is terrible jitter-wise w/ some low quality chips, but you can definitely improve it a lot.
Onkyo boasts about exactly that anyway:
SE-U33GXV (B) USB
PS: ah, there used to be more infos about the jitter correction of this card, looks like they took it off..