i have the hsu vtf 3mk2 in a room thats 12 wide by 15 long and about 8 feet high. i like deep bass and it well give it. but its very loud in the room and big it practicly shakes the whole house when your watching a good action movie. i have it set at -3db its calibrated with the volume about half way on the reciever. i had to turn down the volume on the sub between a quater and half just to stop things from vibarating. its also huge at close to a 100 pounds its not fun moving it around. so to say the least it would not be wise to get this to replace the svs since its bigger. did you ever look at 8 inch velvodyne subs there suppose to be great and not very big.
