Soeaker cables technologic dilema…

Sorry but I started this thread not to educate about shielding. 
But to give you a clue shielded cables makes for example Synergistic Research, 
If you have something interesting to say in main topic, please do so. 
 

milimetr

Sorry but I started this thread not to educate about shielding. 

You mentioned shielded speaker cables, so it seems reasonable to ask: To what is the shield connected? What would be the advantage of an unconnected shield?

... to give you a clue shielded cables makes for example Synergistic Research ...

Hmmm, I see that its Galileo Discovery cable states:

Shielding: Silver Braid -Quantum Tunneled Ground Plane Technology

It isn't clear just what that is or where the shield would be attached, so I can't answer your question of  "what to expect" from its use. Perhaps others here will be able to assist you.

Well first you said.

"We have two technological solutions when it comes to speaker cable"

Then @cleeds said.

"A shielded speaker cable? I've never seen such a thing in a home installation. To what would the shield be grounded?"

Seems reasonable to me.  So, I'll add that any kind of shielding increases capacitance and reduces inductance. Then there are these by In- Akustik where they engineer their cable to use air as the electrolytic and avoid the capacitance that's created when insulated conductors are twisted together or braided as in some speaker wire configurations. You could argue that lower inductance is a good thing and capacitance doesn't matter anyway. 

Does two separate runs of wires reduces capacitance compared to shielded star quad twist?

@faustuss 

"You could argue that lower inductance is a good thing and capacitance doesn't matter anyway."

Yes, in speaker cables, low induction and resistance are desirable and capacitance matters little until it becomes so high as to affect amplifier stability.  That is why Alpha Core Goertz used to offer Zobel Networks with their speaker cables when they were going to be used over a length of 10Ft or with OTL amps.

Regarding geometry, the cross-connected star-quad will have lower inductance than the twisted pair, but either should work fine from that perspective. The cross-connected star-quad should also have lower resistance due to the larger aggregate gauge of wire.  I would not recommend using the star-quad cable as an internally bi-wired cable.  I would use two separate runs of cable if bi-wiring, regardless of which form of the cable you choose.,

Regarding screening or shielding, one example of a company that uses it for home audio speaker cables is Supra Cables from Sweden.  Here is the datasheet for their top speaker cable.  This explains that the shield pigtail is to be connected to a ground terminal on the amplifier, or maybe a screw in the metal amplifier casing.  They do NOT recommended connecting it to the minus speaker wire terminal.  The purpose of the shield is to "provide an additional path for electromagnetic interference (EMI) and radio frequency (RF) interference (RFI) to dissipate, potentially reducing hum or buzz."