Harbeth 40.2 and REL SUBWOOFER really killer combo

I was hesitant to add subwoofers to my Harbeth 40.2 speaker because my room is moderate in size 21.5 by 13 but adding REL SHO/5 pair of subwoofers has really given the speakers greater extension and overall presentation is more dynamic.  I am going to upgrade the REL subwoofer cable and expect that will further improve the sound.  I am using the Harbeth 40.2 with the Pass Labs Int-250 and strongly recommend Harbeth fans give it a try.