Evaluating CD players

saikat · #11 12th June 2008, 02:25 PM

It is kind of difficult to understand all the details as the terminology used by the vendors are different; up-sampling/oversampling et all. So how do we figure out if the up-sampling is async. or not?

Have read up at a couple of articles that oversampling results in better audio, so when will a 44khz sampling sound better than async up-sampling of say 192khz (assuming the rest of the specs are same)?

hifi · #12 12th June 2008, 02:49 PM

Quote:

Originally Posted by TLR

Well, most CDPs have an output impedance of a around 100 Ohm. For a low output impedance around 50 Ohms would be a very good value, especially when it's a valve output stage. The lowest I have come across was 34 (I think) for a Audionet CDP.

This is definitely valuable information, I will update my post with this information.

hifi · #13 12th June 2008, 03:02 PM

Quote:

Originally Posted by prem

Jitter specs is very important. More importantly try and avoid asynchronous upsampling. Most cd players today do that and thus the dissatisfaction. Stick to non oversampling cd players or synchronous upsampling players.

Do they provide jitter figures?

Do CDPs do oversampling? Or is it upsampling?

prem · #14 12th June 2008, 08:01 PM

I do not know if jitter figures are given but normally reviews provide jitter figures.

Oversampling is a multiple of 44.1. Could be 2 times, 4 or 8 or 16 times. Synchronous upsampling is similar to this. Asynchronous upsampling is from 44.1 to 96 or 192. Since 96 or 192 is not a multiple of 44.1, the chip does its own extrapolation and this is where errors creep in. Upsampling or oversampling reduces jitter.

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