Marie, that's an interesting article. My understanding was that one of the advantages of bi-wiring is that the cross-overs themselves can be made simpler and that the speakers can be more electronically isolated from one another. The advantages of that could be achieved with a high quality jumper cable if the speakers are designed for biwiring.
I suspect most manufacturers also design the actual wires themselves differently -- low vs. mid to high frequencies (e.g., the AWG of the bass cable is higher than the AWG of the mid/tweeter cable). So, there would be sonic advantages to biwiring even if the wires were right next to each other.
Ideally, the wires should be separated. In fact, even the positive and negative wires in a traditional two wire speaker cable should be separated. This is expensive and inconvenient so is seldom done (though there are some clever means out there attempting to cancel out the magnetic fields created by the wires). The lower the impedence of the speaker (and woofers tend to be the lowest), the higher the current flow. The larger the speaker (all things equal), the more energy is needed to move it so current flow goes up again. The higher the current flow, the higher the field generation aspect of the speaker wire. I'm not sure what's so magical about an 8" speaker vs. a 10" speaker relative to his comment about when biwiring is needed. Sounds like an arbitrary point of departure to me.
IMHO, he is overplaying the advantages of having the wire several inches apart. Is it good to separate? Yes. Is it a killer not to? Probably not to the extent implied.
I suspect most manufacturers also design the actual wires themselves differently -- low vs. mid to high frequencies (e.g., the AWG of the bass cable is higher than the AWG of the mid/tweeter cable). So, there would be sonic advantages to biwiring even if the wires were right next to each other.
Ideally, the wires should be separated. In fact, even the positive and negative wires in a traditional two wire speaker cable should be separated. This is expensive and inconvenient so is seldom done (though there are some clever means out there attempting to cancel out the magnetic fields created by the wires). The lower the impedence of the speaker (and woofers tend to be the lowest), the higher the current flow. The larger the speaker (all things equal), the more energy is needed to move it so current flow goes up again. The higher the current flow, the higher the field generation aspect of the speaker wire. I'm not sure what's so magical about an 8" speaker vs. a 10" speaker relative to his comment about when biwiring is needed. Sounds like an arbitrary point of departure to me.
IMHO, he is overplaying the advantages of having the wire several inches apart. Is it good to separate? Yes. Is it a killer not to? Probably not to the extent implied.