Subwoofers - Front Firing or Down Firing - Which Sounds Best?


Any advantage to woofer cone facing toward listener as opposed to firing down to the floor? Thinking of upgrading my 20 year old B&W ASW-650 sub to get that oh-so-pleasing belly message which lives in the 20-ish Hz range (very rare I know). SVS has the "tube" subwoofer (PC-2000) at a reasonable price. Just wondering if the floor-firing model would disappoint? Wouldn't want the hassle of returning if it did. Any opinions? Current users? Thanks. 
128x128dweller
You know the answer: which sub matters far less than how many. They can be upfiring, downfiring, tubes laying sideways firing or mounted up on the wall ceiling firing. Just as long as there's four firing. Then your 20-ish range will no longer be very rare, but consistent and true to the recording.