Wiring two post speakers with biwire cable

What you are proposing is called shotgunning and the results will tend toward a somewhat looser and fuller sound than a conventional single run of the same cables.It is normally used in tailoring a system to acquire a larger presentation.
You can alternately attach just a single set of connectors to the speaker end of the biwire pair for an interesting and educational experiment in capacitive loading.The sonic results will vary depending on your amplifier and the particular speakers being used.
As Aknorth stated, the unused ends should be securely taped over or fitted with wire caps to prevent an accidental short.

If your speaker cables are the same as the non-biwire versions you will not be shotgunning. Many brand of speaker wires are bi-wire capable. There are mulitple conductors (separate wires) per channel. All they do is segregate the separate conductors into 4 on the speaker end instead of 2. These type of cables will therefore be no different than the non biwire cables if used on your speakers.

1)Turnaround has a pair of biwire speaker cables, consisting of 2 sets of single wire cable in a common jacket
2) he intends to use half of the bi wire set to make a single run, either with an open ended ,unconnected pair on one set of speaker terminals or tying the separate pairs of runs together to form a single but doubled parallel pair
3)shotgunning simply involves runing 2 parallel identical runs to the speaker terminals
If he is using just a single pair run from this setup, he is using one half the number of strands, one half the amount of cable and in a configuration and topography with different load qualities including the added capacitance of the unused second run.
If he ties them all together at the speaker end ,he is effectively doubling the run in parallel.
Semantics aside, the results will still be a shotgun configuration if he ties both runs together.

Sugarbrie,
It wasn't until after my last posting that I finally understood the full implications of your statement.It never occured to me that a company would stoop to such a cynical marketing ploy as the halved "biwire" scheme that you were referring to.I sincerely hope that the cable products that you address are sold for the same cost as the single run cables from which they would have been derived.Care to name names?

Caterham: A lot of cables are sold this way. Most of the Straightwire, Audioquest, Kimber, Wireworld, etc; you get the same cable whether single or bi-wire. The cost is usually only +/-$30 for the extra labor to terminate in a bi-wire configuration. If you go the their websites you will read that the cables are "Bi-wire capable".

This does seem that strange to me. If the speakers are not biwire, the signal is split to the low/high inside the speakers. Bi-Wire is moving it back to the amp (moves the crossover back). Many brands do not make a shot-gun cable, you have to terminate double runs.

I realized later what you were saying also. There are many bi-wire cables on the market and they do cost a lot more than the single cable because they are double inside (MIT, Nordost, Analysis Plus).

So Turnaround; what kind of cables do you have?????