Well I joined the Silversmith FIDELIUM Speaker cable club today

Fideliums look more fragile than they are.  However, finger tightening them or going a little easy on using a wrench to torque them down, is probably prudent.  Perhaps because of their lack of connectors, their use would be contraindicated if you rotated speakers in & out of the room daily, but other than that, handle them as you would with any other speaker cable.    

Resistance suppositions are fine, but when I compared Nordost and Iconclast speaker cables on my SoundLab's (which go as low as 2-ohms), the Fidelium's won.  Electrostatic's in general like to "see" speaker cables with Low Capacitance, Low Inductance and Average to low resistance.  Nordost fit those requirements, yet my audition pair weren't as good as my 10' Fidelium audition pair.  They stayed and the other two cables went back.  I even switched from 10' to 12' Fidelium's with no resulting differences. 

With the Fidelium's and the other audition pair's I noticed little difference in frequency response.  What prompted my preferring them was their sense of ease (for lack of a better description) and a better soundstage.  The differences were astounding, but there.  Because I liked the Fideliums better and they were a couple times less expensive than the other two, keeping them was an easy decision.

Obviously, everyone's results will vary, especially depending upon one's amps and speakers.  But that's why manufacturer's like Silversmith have a trial period.  So rather than guessing about this, that or another thing, simply try them.  You will be surprised when you receive them in a feather-weight, hand-size box.  Although based on research, I expected them to weigh little and take up little space when rolled-up, the box's feel and size was still surprising.🙂   

Oops, please NOTE:  The sentence in the 3rd. paragraph of my above post, should have included the word NOT, as in:  "The differences were NOT astounding, but there."

And yet another modification to my above post: 

I mentioned a change from 10' Fidelium's to 12'.   Actually, I moved from 8' ones to 10' ones.  Ten feet is the longest Silversmith sells.

mrmb,

The only impedance curve I could observe for Soundlab was the A1 on Stereophile. I will attempt to insert it here. If this speaker was used with these Fidelium cables there must a change, I would consider large, in the frequency response, more so with the 10 foot version. That change, based on the graph below which may not be appropriate, would mainly be a gradual reduction in high frequencies starting at approximately 2KHz, increasing to a 3db drop by 10KHz, and 6db at 20Khz. My ears have not heard 20KHz in many decades, but I would notice a change at 10KHz of several db (at least I think I would). There could be a small emphasis close to 200Hz that is audible.

Perhaps what this cable does is lay bare the audiophile claim that they "really know there systems and would know if something changed". I don't mean that specifically to you mrmb. Unless a speaker has constant impedance, this cable must make significant frequency response changes. I don't think that can be debated, though the amount of change will depend on speaker impedance. Some users really enjoy this cable, but I have not read any comments (other than negative) that indicate a realization of significant changes in frequency response.

I wonder what is driving the limit of 10' as the maximum length available.  Would 12' be:

too easy to damage?

too hard to manufacture?

create problems in capacitance / resistance / inductance / impedance?