The STF-3 can be ran in 18HZ mode also, with one port plugged . It is an accepted practice from Dr. Hsu himself and will not void the warranty.

With both ports open the STF-3 is tuned to 22HZ and does quite well. I have no idea as to how the 350 would do in a comparison.

Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud