Recording quality of Dorian?

Hum/hiss from the speakers, very similar to a regular hum from amp, but some stronger, appears permanently when I play this CD... Since on other CDs there was no such a problem, I concluded that there is something wrong with recording there.
On the first track some background strings appear... they sound kinda strange, with kind of hissing, I tried on two different setups: with and w/o HDCD. Without HDCD it appears stronger...

I think the noise you hear is outside traffic.
I hear it on some Dorian CD's too.
Rade

I have always been happy with Dorian purchases.

Have you noticed difference in quality between what they call xCD and their regular CDs?