The Quadraspire QPlus Advanced is no snake oil. It is a tweak that has an audible and reproducible positive effect. More air, more low definition. We think it’s a tweak for those who have their system in order: cables, acoustics, placement of speakers. Then this can be the next step. Fact is: we’ve been playing with it for a couple of months and don’t want to get rid of it anymore. It just works. But fact is: it is not a ‘bang for the buck’ tweak.