I did some homework years ago and tested a variety of units. First of all, some work better with high impedance basses, and some with lo-Z basses. That's why I have separate boards for different bass types.
Clean blend is not my thing. X-over is (like IE Divaricator). With a X-over I can use effects in a different way than without. Low end is clean and makes the thump. High end can be pushed, even over ordinary limits when in need.
X-over is easy to use. The main thing is to find the cross-over frequency that suits the sound preferred. I have found 400 Hz functional, yours may be very different, or even changing. Try it, you'll like it.