To Bi Wire or not to Bi Wire that is the question?

Yes, biwire often helps with sound and imaging. Designers like Vandersteen believe in it, too.
B

As usual, a big +1 for @gdnrbob!  I have had Vandersteen's for about 30 years now and every model has been biwired as Richard is quite insistent on it if you want to fully realize the beauty of his designs.  If you do biwire, use the same cable geometry for the mid/treble and the bass.  

Bi-wiring does nothing except changing the impedence the amplifier sees by a small amount. It is impossible for it to impact imaging, which is the off-axis response interaction between the speakers, it is impossible to alter the off-axis response relative to the on-axis.

This is a well travelled repeating post theme over the last 15 years here on AGON

here is a very brief selected sample ....all with the same conclusions.
roll up your sleeves and do your research here on AGON and other audio forums.

(1) it is entirely system dependent.... and until you actually do an A-B bake-off... you won’t know.
(2) Some speaker manufacturers indeed do favour them (Vandersteen ....) but some of the top cable manufacturers (CHORD, NORDOST....) are opposed . Without prejudice to the effects that the absolute benefits are always system dependent, a large chunk of the high-end quality build brands are moving away from bi-wiring in favour of shotgunned runs and jumpers.

Biamping ... Different story.

E.g. NORDOST 

http://www.nordost.com/downloads/NorseJ ... ctions.pdf

CHORD

http://www.chord.co.uk/help-and-informa ... ngle-wire/

".... Many hi-fi and home cinema loudspeakers have two pairs of binding posts. This allows the speaker to be either bi-wired using two sets of loudspeaker cable or bi-amped using two amplifiers.

As a general rule (and there will always be exceptions) we tend to find that bi-wiring will open out the sound stage and increase perceived levels of detail. However, single wiring will often sound the most musically coherent. There is also an issue with single and bi-wire speaker cables. In all the research we have carried out, a single wire speaker cable out-performs a bi-wire cable of equivalent cost. This makes a lot of sense; the single wire speaker cable has two high quality conductors and the bi-wire cable requires four. So for a given budget, we believe that a single wire cable will always out-perform the equivalent bi-wire cable, so much so that we no longer produce dedicated bi-wire cables..."
(3) Thus there is no silver bullet one size fits all answe ..... full stop.

https://forum.audiogon.com/discussions/2-runs-of-wires-or-1-run-w-jumpers

https://forum.audiogon.com/discussions/speaker-jumpers-same-brand-as-speaker-cables/post?highlight=B...
https://forum.audiogon.com/discussions/to-biwire-or-not-to-biwire-that-is-the-question?highlight=Biw...


https://forum.audiogon.com/discussions/should-i-bi-wire-or-use-jumpers?highlight=I%2Bwire

Quite frankly chasda, it doesn’t matter what other people think. 

Taking everything that was said into consideration, does it make a difference if you use your amps A speaker posts and double up, or run a set of wires to A and a set of wires to B and simply select both A & B speakers? Hope that makes sence.

@mzkmxcv.   You might want to be a bit cautious using the word, "impossible".  More often than not use of that word leads to fallacy.

Not a fair comparison.  To bi-wire, you're using twice the length of cable.  Compare better quality single wire+jumpers that costs the same as the doubled-up bi-wire cable, then decide.

@hifiman5 
 
Don’t have to tread lightly when there are no caveats. Imaging s based on the off-axis response on the two speakers and also on your positioning of the speakers. It is literally impossible to alter the off-axis without also altering the on-axis. Channel separation/isolation is the only aspect which affects imaging, but bi-wiring can’t improve that.