Unfortunately the negative nellies are out in force as usual with tweaks. What bothers me is these individuals don’t even bother to try what they put down. Maybe their systems or ears just don’t make the grade so they wouldn’t discern any differences no matter how good a product is but more than likely they get a kick putting people down who are willing to use their ears and their brains.
Having said that, tommylion nailed it. I tried a yellow and was intrigued enough by what it did to try the red. The yellow went into a second system. The red really kicked everything up a notch. As tommylion stated the bass got deeper and tighter. The soundstage got bigger and I heard details I didn’t know were in a some recordings. I was so impressed I traded the red in for a red/black. It has only been in the system a couple of days so I will wait before commenting.
All three units were plugged directly into the outlet that feeds my Synergistic Research power conditioner which feeds my 2 channel system.
There is nothing impressive looking about these QSA units but they sure do make a positive difference.