I own CD Technics SL-PG 590 and NAD C 350 + KEF CODA 7 speakers. I want to replace Technics SL-PG 590 with NAD 521 CD. Can I expect any improvments in the sound.
Yes you can - but I am getting Shanling CD-S 100 which is said to be even better than NAD 541.
NAD 521 will be an improvement, but there are even better ones for a little more money - and you will be able to hear more of an improvement - smoother sounding that is so pleasant.