It is us that holds the charge when we get shocked, not the carpet. If your humidity is really low, that could be having a real effect on the sound (more attenuation at high frequencies). Get a humidifier. Cable elevators can't fix humidity.
We all know that signal is flowing through the cables and that most carpeting can develop an electrostatic charge that can zap us (discharge) when we shuffle across the floor when the weather is cool and humidity is low