There is no way that speaker cables need a burn in. Anyone who says cables need a "Burn In" is out of their mind. All that a conductor does is allow a current path from point A to point B. The distance between the negative and positive conductors and the gauge of the cable does make a huge difference. The type of materials as in the conductor, how they are wound and insulator make a difference. As frequencies go through the speaker cable you have natural capacitive and Inductive reactances occurring as frequencies rise and fall over the wire length as they travel through the cable. The reactances can have slight frequency cancellations and as it will mimic a filter at the higher frequencies.
The higher the frequency rises the more frequency radiation off the speaker cable will happen.
A properly wound / spaced cable may sound slightly brighter because it will pass higher frequencies better.
The most noticeable difference in higher powered systems would be a current capability of the speaker wire. The current capability will be noticeable in the low end punch or majesty of the lows. The Power amp can better control the speaker back emf (Damping Factor) through a cable with a higher current capacity. Since there are no active components in a Speaker Cable there is nothing to burn in. It is simply an electrical conductor. Most people could not tell the sound difference from 10 Gauge speaker cable from Home Depot from a cable costing thousands from some esoteric speaker cable manufacturer. You would be best to concentrate your efforts on the active components of the system. Speakers, Pre-Amp, Power Amp or receiver. Room Acoustics and Speaker positioning have a much greater affect on sound considering you have large enough conductor from the PA to the speakers. (Distance matters because of increased resistance) Even having stands or floor isolation (Spikes) from tower speakers can help. Don't take anyone's word for it. Many people are out to make a fast buck. Go listen and decide if you can tell a difference and if the cost is worth the price mark up. I personally like my system with 10 Gauge speaker cable at 12ft length. Nothing expensive.
The most noticeable difference in higher powered systems would be a current capability of the speaker wire. The current capability will be noticeable in the low end punch or majesty of the lows. The Power amp can better control the speaker back emf (Damping Factor) through a cable with a higher current capacity. Since there are no active components in a Speaker Cable there is nothing to burn in. It is simply an electrical conductor. Most people could not tell the sound difference from 10 Gauge speaker cable from Home Depot from a cable costing thousands from some esoteric speaker cable manufacturer. You would be best to concentrate your efforts on the active components of the system. Speakers, Pre-Amp, Power Amp or receiver. Room Acoustics and Speaker positioning have a much greater affect on sound considering you have large enough conductor from the PA to the speakers. (Distance matters because of increased resistance) Even having stands or floor isolation (Spikes) from tower speakers can help. Don't take anyone's word for it. Many people are out to make a fast buck. Go listen and decide if you can tell a difference and if the cost is worth the price mark up. I personally like my system with 10 Gauge speaker cable at 12ft length. Nothing expensive.