Are there any specs on the HSU TN1220 output versus a comparable SVS offering? Taking into account the fact that the HSU driver is top firing and the SVS is bottom firing...are there big sonic differences? Why is the HSU top firing...It makes for a top heavy set-up.It appears that SVS with their Ultra line is a hopped up TN1220 (more expensive-sophisticated driver and porting). Are build qualities similar? My gut feeling is that SVS has taken the HSU design to a new level...am I wrong? Does anyone have experience with both? In no way am I putting down HSU...I currently own (2)VTF-3's and am satisfied with their performance...just idle interest in how others look at the two approaches to a similar design.