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In Reply to: RE: Jitter reduction mods posted by Frihed89 on January 28, 2009 at 12:00:06
Good info on this topic available at..
NT
"Live free or die"
The AN DAC chip (AD1865) currently gets its clock signal from the CS8412 digital interface receiver chip. The Tent labs XO device connects directly to the AD1865 chip, bypassing the clock signal from the 8412 chip. The installation requires a bit of micro surgery in both disconnecting the current 8412 clock signal and connecting the Tent device to the correct pins of the DAC chip. You will also need to find a suitable power supply (or build your own) for the XO device within the chassis of the DAC.
Contact Guido Tent of Tent Labs for more info.
Just ran across this instruction manual...
NT
"Live free or die"
I have the 2.1C Sig DAC and am currently using one of those Wadia 170i iPod transports. It sounded okay as it was with uncompressed audio files, but compared to using the 2.1C with my CDT-2/II transport it was EXTREMELY lacking. Using the first track from the Buena Vista Social Club CD, the real CD transport just absolutely trounced the little Wadia transport with the same song uncompressed playing from the iPod. I really suspected that jitter was the reason why there was such a huge difference.
So I decided to reclock the bitstream signal using one of those Monarchy Audio 24/96 DIP devices. The one I am using is NOT the classic version that also upsamples. I did not want to interfere with the AN 1x oversampling scheme. Its just a super accurate and stable clock. It reclocks and thats all.
The difference with the clock added was nothing short of sensational. The bass was more controlled and punchy, the voices more natural, and the imaging improved dramatically. Now granted it still does not beat out the 2.1C with a CDT-2/II attached to it, but the sound is MUCH closer than before.
Naturally I tried the clock between the 2.1C DAC and my CDT-2/II and found that it made no improvement at all. It did not degrade the sound either as far as I could tell, but there was no improvement either. I was using runs of SOGON digital between transport and clock, and clock and DAC.
The take home point is that if you're using a super nice transport like the AN CDT-2/II which I suspect has very very low jitter to start with, reclocking the signal is not going to help. You don't need to reclock.
If you're using a not so great transport that inherently exhibits tons of jitter, reclocking is going to make a huge improvement across the board.
I hope this information is of some benefit in this discussion.
Mark
Thanks, Mark, I find it useful as I've considered reclocking but haven't tried it. I also have the AN cdt2/II and I'm using it with a factory dac 2.1xsig.
ot a bit, and fwiw: The cdt2/II is exceptional. In every system I've plugged in into (ok, I've tried it in maybe only 4 or 5) it makes itself known in a good way.
Thanks again for your experience as it will save me the trouble! I'll focus my efforts on improving my dac next...
Doug
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