This is pretty much a free tweak. Put your audio equipment device or interconnects into the freezer for 2 hours. Then move to the fridge for 1 hour (slow cool down). Then take out and let it sit for at least 5 hours to allow any condensation to dry. What this does is additionally solidify the solder points and allows for a closer/tighter electrical transference. Since there is less resistance over the solder points, it can also allow some components of electronics to run slightly cooler. I have found additional resolution and soundstage from this treatment. Keep in mind that since you are changing the metallurgy of the components somewhat, you would want to burn in the electronics again for at least 20-30 hours before making any judgements on the sound quality.
Non-solder components like speaker cable can have a subtle improvement by extended freezing (like 3-4 days). It's somewhat akin to a poor-man's cryo treatment.