Ritchie. The EP600 is an outstanding sub which excels in many important areas: high SPL, exceptionally linear frequency response, clarity, detail, low distortion, deep bass, won't bottom, low port noise and good aesthetics. While their are subs with more extension below 16hz such as your SVS, my review indicates much of the output in that range is harmonic and other distortions which explains why Axiom has chosen to limit output on this 12" driver subs to 16hz. The step up from the SVS 20-39 to the EP600 is significant. It is less the case with the EP500 but overall when you compare their relevant features, the 500 is also a better sub.

John