Based on an earlier recommendation by Sugarbrie, I bought a pair of MAS cables from Stu Wein, Audioparts@aol.com. I got a somewhat more expensive model, MAS Grey, for $80 to use with a Cambridge Audio D500 CD player, and have been very pleased. They made a clearly audible improvement in the sound of my system. The MAS Blue cables at $30 or the MAS Black cables at $50 would probably be a good choice for your sister, since she has spent less than $200 on the CD changer and DAC.