Best xlr interconnect for Meridian

I am having problems with a Meridian 596 DVD-CD player. The unit is lifeless (like the bottom fell out) when hooked directly to the pre-amp and used as a player. I have a Audio Research LS-15 pre. When I hook the 596 to a Meridian DAC, the unit sounds much better, although a tad bit bright for my liking. Meridian is noted for its laid back sound so I figure that something is lacking. The DAC goes through the balanced inputs of the LS-15. I am using Monster "M" series cables from the amp to the AR, Analysis Oval Nines. I have some cheap interconnects supporting the balanced inputs. I had my equipment stacked together and I noticed that when I separated the DAC and the 596 from the amp and preamp everything seemed to sound better. Prior to purchasing the Meridian, I had a Cal Audio Delta that did not pose any problem. Any one have any suggestions??? I am desparate and my wife is getting irritated every time I mention anything relating to audio equipment. Thanks...