Thomas what do you think about

the F4, it has a 6.8 frequency on silver and do it have the same depth as the F75?? Thanks

I do not have a F-4...... but I imagine it is a good bang-for-the-buck; however, probably not as powerful as the F-75. Even though the F-75 is a higher freq.... it'll most probably still trump the F-4.

Tom