Are the current Tek and Fisher Machines 2,3,or 4 filter?

Years ago, the 2 filter detectors were slow sweep, while the 4 filter models required a much faster sweep . Does anyone know what the current madels are nowadays? I dont read about "filters" anymore. I finally got out with my Omega today, and seem to get better results with a faster sweep speed. Is this one a 4 filter model?

Very different processing now.