I got this mainly for the high pass filter. I was having a problem with muddy low end rumble and not getting a consistent sound with my upright bass in different rooms. After diving deep down the high pass filter rabbit hole I came across the Q strip. It look like it would do the job and it has. The parametric mid control is very nice. The low pass filter also works great for 12 string and acoustic guitar. This is a very versatile tool and I could find a use for another half a dozen of these. I'm using it in conjunction with a tech 21 sans amp bass driver. It not only makes my bass sound better but also clearing away the muddy low-end makes the whole band sound better.
Warrenton Oregon, USA