Hey there. I know this is an old post but I wanted to know how the harbinger held up long term. I currently have one of their usb mixers which I run my Helix and a Headrush MX5 into. I run a pair of Headrush frfr108s out of the mixer in stereo and then out of the 108’s into an Alto TS212 to sum them together in the center. I was thinking of picking up another 12 but was unsure about the quality of the harbingers.