The correct answer is 0 you should be burning your cd's to a computer out puting via a high quality usb cable to your dac and you will get far superior sound with the ease of use that modern digital file management offers.
Sweeping statements don't address the variables which are often prevalent in most situations. Going from disc play to computer audio OK if all you own are Redbook CD's. With large collection of SACD's things get more complicated. Spend more money on another iffy eBay PS3 to rip SACD files? No thanks.