I connect my CD player to my Beocenter 7000 using a DIN to RCA converter lead that I got from eBay.
I *think* the Beocenter 7007 has a bigger range of connection options than the 7000. hopefully someone will be along in a bit who can confirm this.
The Becnter 7000 series have superb amplifiers in them, so it is well worth doing.
Simon