Upgrades de Leitor de Cd Clocks "Low Jitter"

Olá,
estou a reunir informação sobre o assunto
e para já tenho:
- http://fidelityaudio.co.uk/clocks.shtml
- http://www.tentlabs.com/Components/cdupgrade/xo2xo3/index.html
alguem com mais informação?

Mais umas achegas:

Digital Audio, an introduction -> http://www.lavryengineering.com/forum_images/Digital_Audio.pdf

Sampling Theory For Digital Audio -> http://www.lavryengineering.com/documents/Sampling_Theory.pdf

Sampling, Oversampling, Imaging and Aliasing - a basic tutorial -> http://www.lavryengineering.com/white_papers/sample.pdf

On Jitter -> http://www.lavryengineering.com/white_papers/jitter.pdf

20 BIT Equipment For 16 BIT Work? -> http://www.lavryengineering.com/white_papers/dnf.pdf

Sample rate and bit depth -> http://www.musiciansfriend.com/document?doc_id=88273&src=3SOSWXXA

What does the bit depth and sample rate refer to? -> What does the bit depth and sample rate refer to?| Dolphin Music

Dither -> Dither - Wikipedia, the free encyclopedia

Como funcionam os DACs -> How DACs Work

Much Confusion Exists over Jitter: How and Where to Measure It, and How to Eliminate It -> Jitter and Its Effects

Sem dúvida que o um sinal de relógio sem incertezas melhora o som, eu próprio experimentei em vários aparelhos, mas confesso que nunca vi tanta melhoria na qualidade da reprodução, como quando se substitui toda a interface analógica depois do DAC por um transformador. Essa é mesmo compensatória.!!!
http://www.audionotekits.com/dac3_1.html
http://www.sowter.co.uk/dacs.php
http://jeffrowlandgroup.com/Technology/LineLevelTrans.htm

já me esquecia ....
http://www.newclassd.com/index.php?page=1
http://www.audiocom-uk.com/