Mr. stevcham
The 1000m resistance is given as the 1m is of a very low value. From that figure, it can be calculated by dividing it by 1000 and multiplied by the actual length (number of meters) and also by 2. Any speaker cable of a given length (2.5m) has a wire that goes to the speaker (red) and one coming back (black) so it is 5m all together.
No aircraft carrier. Also no one should place his amplifier 1000m from its speaker. That’s common sense. It seems to me that you could use some more of it!