Welcome Azeria,
One of the the easiest, cheapest way is to use your computer as the music server and add a Digital/Analog Convertor (DAC), checking to make sure both components use the same connectors. I ripped all my CDs (copied to the computer permanent drive) using iTunes (takes about 7 minutes per disc). Search the Apple Circle for a ripping primer that our fearless leader JohnR created for the exact how to. I use my laptop with a 10 ft USB cable (shorter runs recommended but I use the laptop while listening) and connect to a USB DAC/preamp that is remote controlled, but even cheaper options exist.
DAC costs range from $100 on up. The technology has been changing rapidly, so buying used or 'over investing' can be a mistake. Another great option is to get a $20/month subscription to Tidal (millions of CD quality real time downloads that stores the songs you've heard and learns/suggest other albums to you). I have an audiophile friend who uses only Tidal, with a $35 Chromecast wireless receiver/DAC that he controls from his smartphone.
Better sound quality can be had by using a dedicated music server that is specifically designed for music playback, but currently requires some computer knowledge to setup plus a tablet/smartphone/computer to wirelessly control, with prices starting around $500. Note that years ago it was popular to dedicate/even modify a Mac Mini for audio use, but with the advent of dedicated/audio designed servers that is no longer viable from a cost/sound quality standpoint.
Various PCM/DSD/DXD digital formats exist. DSD/DXD are closest to SACD, but not sure about the conversion possibilities.
