Soeaker cables technologic dilema…

I have made extensive comparisions of my NES-3003 MKII speaker cable with screen connected to the outboard ground pin and screen left not connected. 

I must say that the the diferences in sound are quite pronounced. 

Without screen connected bass is very pronounced, too much for my taste. Bass predominate and is out of proportions. Without screen connected sound is more free and open, the things sounds fuller with a bit longer decays. 

With the screen connected the bass is shorter and better controlled. Is more balanced now hovewer decays seems to be shorter. There is more clarity in the whole spectrum, notes are better separated with more black background. 

I not decided yet what variant I do preffer.

@faustuss 

The result of twisting or braiding and shielding insulated conductors reduces inductance and increases capacitance

Really?  Take a straight wire.  It has self-inductance caused by the magnetic flux created as current flows.  Now twist the wire into a spiral.  Keep twisting it until it becomes a coil in shape.  The self-inductance increases enormously because the magnetic flux now interacts with many loops of the wire.  Stick a bit of iron in the middle of the coil and you have built half a transformer, or linear power supply as it has been re-badged.

Complete the transformer by adding a second coil.  Do you really think it will work better if the separation is increased?

The electromagnetic force decreases as the inverse square of distance and governs both capacitance and inductance

@milimetr 

I think the cables you are listening to have high capacitance and high inductance compared with more physically open, more neutral cables on the market.

Bear in mind that your speakers (all speakers) have impedances which vary with frequency, sometimes quite dramatically.  Adding ideal cables with no capacitance or inductance, but different resistances, will skew the frequency response of the speakers.  Of course, no real-world cable is free from capacitance or inductance.

I wrote earlier that

Highly inductive and capacitive speaker cables will alter the tonal balance of your speakers but only you can judge if you think it is for the better or worse

I would suggest you beg, borrow or otherwise obtain a more conventional pair of cables just to compare ...

PS.  In many ways, the ideal cable is no cable and I think this partly explains the performance of well executed active speakers

@richardbrand 

what speaker cable brand and model would you recommend for such comparison?

@milimetr 

what speaker cable brand and model would you recommend for such comparison?

I would be looking for a cable with the same or more cross-section, same length or shorter, but with more separation between the conductors.  Trying to keep the resistance similar! 

Straight or very slightly twisted.  For me, it would be whatever I could borrow from my HIFi  dealer!

Not looking for a forever cable, just one with less capacitance and inductance to see what the sonic effects are.  Sorry I cannot be more specific.  You reported hearing very clear differences with your cable grounded and free floating so just trust your ear/brain system!