Need 20 - 25 foot spk cables.

You don’t need twisted cables. I use 25 foot speaker cables that go under the floor through the basement and then back up to the speakers.  They are not twisted and it is fine.  My system is dead quiet.  I have been using these cables for 10+ years

Canare 4S11 shotgun.

Here you go... canare 4S11 star quad cables terminated 25’ from a good company for $130... for the pair!



https://www.ramelectronics.net/HS.aspx

Driving electrostatic speakers with long runs of speaker cable makes inductance especially critical, because in contrast to dynamic speakers the impedance of electrostatic speakers reaches very low values in the upper treble region. While the impedance presented by inductance ("inductive reactance") increases as frequency increases, while also being proportional to length. And if the goal is accurate transmission of the signal inductive reactance should be kept to a small fraction of the impedance of the speaker at 20 kHz, which I suspect is probably no more than about 2 ohms in the case of your speakers, and may very well be significantly less than that.

However some cables achieve low inductance at the expense of having high capacitance, which is also proportional to length and would be undesirable because that can cause problems for solid state amplifiers which use feedback (as I assume yours does, based on its specs).

I always have great respect for Mofimadness’ recommendations, which I know are based on an enormous wealth of experience. And I found indications that the inductance of the Canare 4S11 cable he recommended is about 120 uH (microHenries) per foot (which would mean an inductive reactance of only about 0.4 ohms at 20 kHz for a 25 foot run, non-shotgunned); capacitance is spec’d as 45 pf/foot; and resistance is equivalent to 11 gauge. Those are excellent numbers for your application. In fact I suspect that a single run would do the trick, rather than a shotgun pair being necessary, in part because the impedance of the speaker is probably very high at bass and mid-bass frequencies. (Shotgunning would cut resistance and inductance in half, but would double capacitance).

I would give much less weight to recommendations by others that are not based on experience with electrostatic speakers, and/or are for cables for which those basic electrical parameters are not specified or known.

Good luck. Regards,
-- Al

KnuKonceptz Kord Speaker Wire Ultra Flex Blue OFC 10 Gauge Cable 25' True AWG on the bay. $50 shipped for what you declare is needed.