The signal travels at close to the speed of light a few feet in difference of a cable doesn’t matter. The higher resistance of a few feet will not change the " loudness" it won’t change anything.
Odd length speaker cables
Given the considerable cost of most high end speaker cables and corner equipment placement in a non dedicated room I am in need of 18 foot run and a 5-6 foot run. How much detriment coiling 12 feet of cable on one side will have for signal path versus difference if one obtains 2 cables of different length?