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What I am calling glare is phenomenon that occurs briefly at higher frequencies, is fatiguing, uncomfortable, and short in duration. Most often occurs on certain piano keys or female vocals, as if a certain note is simply not played well by the system. I was expecting that the cause might be room acoustics, and the solution to be room treatments. I have noticed that when I am playing through warmer gear, I don't get glare, but as I swap in neutral gear, the glare returns. The glare is the worst with my SWL pre-amp, which is the most revealing of my components. The glare got worse when I added the new EE DAC to the mix. When I swap in my Candela for the SWL, the glare is almost gone, and when I run the old DAC thru the Candela, the glare is completely gone. However, with the glare, I get greater detail and imaging. Is this a trade off I have to live with?
You get glare from too much light bouncing off irregular reflecting surfaces. The same applies to sound. That would be the acoustic portion. You also get that from jitter on digital source. I hear it when signal is over-processed within the bandwidth, especially at 16 bit depth. It's like the sharpness adjust on your TV -- there is an optimal point and then the picture gets glary and jagged when you apply more "sharpness." This gets much better at 24 bit (and higher I assume).