Hi,
Mine came shipped with 4.18. So far it's working great.No bugs yet....McMcgoo had sent me a pm about setting the crossover point and he stated the following:
"The standard advice is to set your crossover one full octave above your speaker's lowest frequency, 32 Hz for the RF-7. That would put the crossover for the RF-7 at 60 Hz. I use 50 Hz because my processor does not offer 60 Hz. If you use a lower point, you may not get a seamless transition, i.e., you may have a hole in your lower frequencies. As a result, mine are currently at 60.
"
Mark