Dirac Live Bass Control

Thats different depending on situation, here is a link to a guide you can start from:

Setting crossovers in an AVR/pre-pro with Dirac Live 2 room correction (mehlau.net)

For further information, Dirac Live Bass Control computes the best possible solution taking advantage of a genetic algorithm to manage independent channels used for the subs in order to correct the inevitable interactions among the subs and the main speakers.

It should be taken into account though, that that solution refers to the crossover frequency that is assigned by default.

This usually provides excellent results but sometimes it's useful to experiment with alternative crossover frequencies.

For example, a DLBC customer contacted us reporting "with the exception of the big suck out in the bass, the calibration sounds really good" and added that it "is negating the usefulness of DLBC"

He kindly shared his project with us and this is the graph that shows the effects of the interactions of the Front Left & Right speakers and his subwoofers with a crossover frequency of 70 Hz:

The result isn't satisfactory because of the reported suckout around 80/90 Hz. Bass Control computes the best possible results for the crossover frequency that is assigned by default but the user has to choose it... so that some experimentation is possible and in some cases necessary (it would take countless hours without Bass Control).

A (relatively) fast new computation shows the following results if the crossover of the Front Left & Right speakers is set at 90 Hz instead:

Worth noting that, on the contrary, the default 70 Hz crossover frequency is ideal for the Center speaker: