Hi Juan,
The Speaker Array Designer online tools were designed to be used with two speaker array chips, LM48901 and LM48903. Are you using either of these devices?
These devices are now under limited support by TI (they do not even have product pages anymore). The .dat file output of the Speaker Array Designer is a coefficients file which can be loaded onto the LM48901 and LM48903 chips on their evaluation modules.
Kris