I would have to agree , after doing the research SVS is definately a better choice for nice deep bass. The RT-12d's response curve isnt very flat and starts to drop off around 24hz, also the THD % is a bit high (15%) when its playing 20hz and below, You can read a review here: http://www.hometheaterhifi.com/volume_13_4/klipsch-rt-12d-subwoofer-december-2006-part-2.html