I think if you had measured the in-room response you'd have seen differences in the upper bass region.
One contributing factor could be that a floorstander with multiple drivers can lessen SBIR and floor bounce.
There's less IMD since the dual woofers only have to handle the 80-160Hz band whereas on the M105 the small midwoofer has to cope with everything between 80-2300Hz.
One contributing factor could be that a floorstander with multiple drivers can lessen SBIR and floor bounce.
There's less IMD since the dual woofers only have to handle the 80-160Hz band whereas on the M105 the small midwoofer has to cope with everything between 80-2300Hz.