I have: 2 B&W DM603S3 in front [response 49Hz-22KHz, Crossover freq. 4kHz] 2 B&W DM602S3 in surround [response 44HZ-22Khz, Crossover freq. 150Hz, 4khz] 1 B&W LCR60S3 in center [response 70Hz-22Khz, Crossover freq. 400Hz, 4kHz]
If we understood that LARGER speakers are those that can reproduce sounds below 200Hz then I have all Large speakers.
The bass mngmt system of the AVR603 have 6 options to set the crossover point [40, 60, 80, 100, 120, and 200 Hz]for speakers that can not reproduce lower freq. and send it to the SW.
If we assume that the speakers are configured on LARGE and a full range signal is send it to them: it is necessary to configure the bass management? May i put on the center speaker the crossover point in 80Hz in order to obtain the freq. lower than 80Hz pointed to the center in the subwoofer?
If we understood that LARGER speakers are those that can reproduce sounds below 200Hz then I have all Large speakers.
Why would you think that?
Set them all to small using 60Hz for fronts and surrounds, and 80Hz for the center. You could also set the fronts to Large and set the sub to "LFE + L/R" at 60 or even 80 Hz. That way your front speakers get full-range signal and you get bass reinforced under 60Hz (or 80Hz) by the sub.