CD formats...CD vs HDCD vs SACD

[cam083gp]

Hi,

What are the differences in the formats & which of the higher than cd formats are still on sale today?

I notice more subtle differences in my cd player dac vs my external dac for regular cds but with hdcds, the difference in the cd player dac vs my external dac are significantly greater?

Sample rate on my external dac is 44.1khz for both cd & hdcd.

Cd player = Rotel RCD-1072
External DAC = Topping E50

 

[Andile]

 

[cam083gp]

 

[jvr]