Pat, welcome. The concept of comparing DACs in equipment is badly outdated. Modern DACs in even equipment of modest cost(certainly including what you already have)are at a level where although there are still small differences measurable with electronic equipment which is far more sensitive than our ears, this doesn't result in provable audible differences. The DACs you have now are undoubtedly doing the job as well as it can be done.

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Enjoy the music, not the equipment.