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ended up here https://products.electrovoice.com/na/en/cableloss/
You should have moved on, that's really for concert PA where the amp racks are tens of metres from the driver cabinets. They even say something to that effect:
For an 8-ohm loudspeaker connected to 40 feet of 18-gauge zip cord, the power loss is about ½ dB, which is neither audible nor significant,
The traditional 79-0.2 (2.5mm2) is very flexible and much lower impedance than 18awg (0.75mm2). If you want solid core, you have to shop around to get 2.5mm2 twin&earth 6242Y because it's mostly 7 strand on the main conductors, but 1mm2 lighting circuit wire is nearly all single strand conductor. Either can be bent to a fairly small radius once as Dogtemple says.
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I don't remember how high-end your gear is but I reckon there's better places to spend that money to hear a perceivable difference.
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gbj_tester
TheButchersDog
@Velocio
I have made the mistake of looking at speaker cables.
And ended up here https://products.electrovoice.com/na/en/cableloss/
The problem I have: I've got 3m cable, but I need 5m cable for where the speakers will be placed. Additionally I'd like the cable to be somewhat discreet which means being able to flex 90' in a couple of places (it's OK if it doesn't do that, but needing a significant curve means it's less discreet and the cable would also need to be a bit longer still. The amp is powerful (800w), the speakers high impedence (8ohm).
To get a flexible cable implies a core of smaller wires woven together, i.e. 12-24 strands of 0.2mm wire per cable.
To get less power loss in the cable implies a higher gauge, i.e. 2mm solid core to a cable - which is a bit like an electrical cable for a cooker, it isn't flexible.
I now know why I can't find a flexible cable, all the people who have big speakers and powerful amps obsess about not losing power due to the cables and all purchase what is essentially the cable for an oven.
Yet I would like a more flexible cable even if it were ultimately larger to achieve it (more strands, slightly larger strands).
The question then: Does anyone know a speaker cable that is flexible and will carry a high amount of power?