I ordered BJ series 1, 4 and FE 3-meter cables to compare to my WW 1 meter cable because I needed a 3-meter cable for my new setup. Before spending $2k on a WW 3-meter cable, I wanted to see what the differences were. To me the FE was superior to all the others. The BJ are so inexpensive, why not order both series 4 and FE and compare for yourself. Let us know what you find if you do.