How I tamed digital glare.

For months I have been trying to eliminate digital glare in the my system, which showed up most noticably in the upper middle frequency vocal range, especially female vocals. I tamed some by replacing the stock fuse in my dac with HifiTuning Supreme Cu on the sage advice of Chris Van Haus of VH Audio, resulting in a significant improvement in tonal density, detail and clarity. So far, so good. Today I lightly dusted the laser lens in my CEC transport with a microfiber cloth and was astonished to discover a substantial improvement! And the laser lens and drive compartment appeared clean to begin with (in a smoke free environment). I tried cleaning contacts, swapping power cords and interconnects, rolling the tube in my MHDT dac, and so forth, but this simple protocol was more effective than any of those experiments. I suppose results may vary as every system is unique, but for me this simple tweak was revelatory: greater clarity and a signifcant reducton of hash. Wish I had thought of tt in the beginning; it would have saved me considerable time and frustration.
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Pretty much.  The final step that removed it from the discussion in my system were the CAD Ground Control units.  Apparently, high frequency noise is the enemy when it comes to digital.  Not cheap, but couldn't imagine my system without them.

You may think you’ve tamed distortion and noise in digital playback but you haven’t. Everything is relative. Until you’ve stopped the CD from vibrating and fluttering and have put the kibosh on stray laser light getting into the photodetector you’ve haven’t got more than around 75% of the way there, even after taking many steps. You simply would not believe the information on the disc that you cannot hear. 
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While I agree whole heartedly in every way, we did hijack a thread and for that , again I offer apologies to the OP.