I really have not hear Borrensen X3, but I never would like to either, nor would ever look at their graphs seriously. I do think that Perlisten went small with 6.5" drivers on bass end, even if 4 of them (but they actually knew why and pulled it off to large extent) but this has infant bass drivers (more like midrange) and 2.5 way design. I can imagine why they measure as bad as you say. Our ears are deceivers and can take us places where we should not go, thus the specs and measurements should guide us in at least right direction. Or our individual preferences might be so extreme that they would not be valid for the broader audience.
Borrensen X3: dimensions of 129 x 34.5 x 60.7cm HxWxD; 55kg; 35Hz-50kHz bandwidth; 90dB sensitivity; 4Ω nominal impedance; and dual 4½" woofers for the 2.5-way array's 'half-way' bass section.
BMR Towers are respectable speakers, but have their limitations. Might be a good value though.