Bernard, using a buit in amplifier, there is no benefit to have it bi-wired, but the other models that are not, my ears can tell that bi-wired is a good thing. First of all, the bass is more robust and profound, and the stage is more life-like. Also the dynamics change for good. The amplifier seems to be less stressed at high level, usually you can tell that using the same SPL average in your listening room, with bi-wired, the volume knob is pointing less level. Le'ts say that without bi-wired, your usually volume control is pointing 10 0'clock with bi-wired usually points 9 o'clock. This means that using bi-wired, you are saving power energy from your amp, making easier to drive difficult passages with no problem.