My suggestion after trying everything that is possible with the Devialet is to run the speakers full range. Using the crossover is processing the whole audio signal which results in a more digital sound. Try to find the best phase setting for the sub and experiment with a crossover frequency between 40 and 45hz. The best is to use a measurement tool, this can even be a smartphone for a rough estimate. Depending on room resonances it may be useful to use a lower crossover frequency, e.g. if you have a room mode around 45hz.
What can also make a huge difference is the placement of the sub. All in all millions of possibilities...
What can also make a huge difference is the placement of the sub. All in all millions of possibilities...
