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unless you have a much bigger house than we're imagining, that's going to lower your cut-off frequency by an insignificant margin once you're down to cable runs in the 10m range.
Thank you!
I'm only getting to an approximation of 12 meters because it's not going to be a straight line (fishing cables between joists trying to restrict floor boards lifting to the ones that have already been lifted and are damaged)
Will give this a go when I find time...
The modest speakers I have in mind are indeed 8 ohms
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veLLo
BRM
For 8Ω speakers, you'd presumably want to keep the wire resistance down to under 0.8Ω on the AvE basis of being able to pull 10% out of any voltage without serious consequences, which equates to around 50m cable length in the common 79/0.2mm speaker wire.
The cable resistance might start to become a material element in any RC low-pass filter in your crossover, but unless you have a much bigger house than we're imagining, that's going to lower your cut-off frequency by an insignificant margin once you're down to cable runs in the 10m range.